product service manual – level 1~2 -...
TRANSCRIPT
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Applicable Country & Regions: Global
Service Manual for BenQ:
LCD G925HDA
(D-SUB + Glossy Chassis
Colors)
P/N: 9H.L2WLA.T8x
Product Service Manual – Level 1~2
Version: 1st
Date:03-17-2010
Notice: For RO to input specific “Legal Requirement” in specific NS regarding to responsibility and liability statements. Please check BenQ’s eSupport web site, http://esupport.benq.com, to ensure that you have the most recent version of this manual. First Edition (Mar. 2010) © Copyright BenQ Corporation 2010. All Right Reserved.
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Content Index
1. About this Manual ................................................................................................................................................... 5
1.1 Important ............................................................................................................................................................ 5
1.2 Trademark .......................................................................................................................................................... 5
2. Introduction ............................................................................................................................................................. 6
2.1 RoHS (2002/95/EC) Requirements – Applied to all countries require RoHS. .................................................... 6
2.2 Safety Warning and Notice ................................................................................................................................. 6
2.3 Compliance Statement ....................................................................................................................................... 7
3. General Description ................................................................................................................................................ 8
4. Related service information................................................................................................................................... 8
5. Product Overview ................................................................................................................................................... 9
5.1 Monitor Specifications ........................................................................................................................................ 9
5.2 Packing ............................................................................................................................................................. 11
Level 1 Cosmetic / Appearance / Alignment Service ............................................................................................ 13
Visual Inspection & Cleaning .................................................................................................................................. 13
Software/Firmware Upgrade Process .................................................................................................................... 13
Level 2 Circuit Board and Standard Parts Replacement ...................................................................................... 27
Product Exploded View .......................................................................................................................................... 27
Six Angles’ View ..................................................................................................................................................... 29
Product Disassembly .............................................................................................................................................. 30
Block Diagram ........................................................................................................................................................ 34
Schematic Diagram ................................................................................................................................................ 36
Troubleshooting ...................................................................................................................................................... 44
PCB LAYOUT ......................................................................................................................................................... 50
Appendix 1 – Screw List / Torque ........................................................................................................................... 57
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Abbreviations & Acronyms
A
ADC Analog to Digital Converter
AFC Automatic Frequency Control: control signal used to tune to the correct frequency
B
BenQ BenQ Corporation
BTSC Broadcast Television System Committee
C
CPU Central Process Unit
CVBS Composite Video Blanking and Synchronization
D
DLP Digital Light Processing / Texas Instruments®
DMD Digital Micro mirror Device
DRAM Dynamic RAM
DVI Digital Visual Interface
DVI-D Digital Visual Interface-digital
DVI-I Digital Visual Interface-Integrated
E
EEPROM Electrically Erasable and Programmable Read Only Memory
F
FLASH FLASH memory
G
G-TXT Green Teletext
H
HDMI High Definition Multimedia Interface, digital audio and video interface
HP Head Phone
I
I2C Integrated IC bus
L
LED Light Emitting Diode
LVDS Low Voltage Differential Signal, data transmission system for high
M
18.5″ LCD Color Monitor BenQ G925HDA
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MOSFET Metal Oxide Semiconductor Field Effect Transistor
N
NC Not Connected
NVM Non Volatile Memory: IC containing TV related data (for example, options)
O
OSD On Screen Display
P
PC Personal Computer
PCB Printed Circuit Board (or PWB)
R
RC Remote Control transmitter
RGB Red, Green and Blue. The primary color signals for TV. By mixing levels of R, G
and B, all colors (Y/C) are
ROM Read Only Memory
S
SDA Data signal on I2C bus
SDRAM Synchronous DRAM
SW Sub Woofer / Software
T
THD Total Harmonic Distortion
V
VGA Video Graphics Array
Y
YPbPr Component video (Y= Luminance, Pb / Pr= Color difference signals B-Y and R-Y,
other amplitudes w.r.t. to YUV)
Y/C Video related signals: Y consists of luminance signal, blanking level and sync; C
consists of color signal.
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1. About this Manual
The purpose of Service Manual is to provide a guide line to engineers to repair different models. The appearance
and capability is introduced in this Service Manual. It is better for repair engineer to have a rough idea of this model
through reading the Service Manual. Please do pay attention to the item part of the disassembly when repair the
machine and also do the protection of panel any time. When repairing the circuit board, please follow the
requirement of RoHS and refer to the circuit diagram and repairing process that attached in the Service Manual.
The method of firmware updated, the way of using the menu and some information that may be used when
repairing are also attached in the Service Manual that provide repair engineer various choice.
1.1 Important
Only trained service personnel who are familiar with this BenQ Product shall perform service or
maintenance to it. Before performing any maintenance or service, the engineer MUST read the “Important
Safety Information”.
1.2 Trademark
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2. Introduction
This section contains general service information, please read through carefully. It should be stored for easy
access place.
2.1 RoHS (2002/95/EC) Requirements – Applied to all countries require RoHS.
The RoHS (Restriction of Hazardous Substance in Electrical and Electronic Equipment Directive) is a legal
requirement by EU (European Union) for the global electronics industry which sold in EU and some counties also
require this requirement. Any electrical and electronics products launched in the market after June 2006 should
meet this RoHS requirements. Products launched in the market before June 2006 are not required to compliant
with RoHS parts. If the original parts are not RoHS complaints, the replacement parts can be non ROHS
complaints, but if the original parts are RoHS compliant, the replacement parts MUST be RoHS complaints.
If the product service or maintenance require replacing any parts, please confirming the RoHS requirement before
replace them.
2.2 Safety Warning and Notice Installation
1. Do not use your monitor under any of the following environmental conditions:
• Extremely high or low temperature, or in direct sunlight
• Dusty places
• Highly humid, exposed to rain, or close to water
• Exposed to vibrations or impacts in places such as cars, buses, trains, and other rail vehicles
• Near heating appliances such as radiators, heaters, fuel stoves, and other heat-generating items (including
audio amplifiers)
• An enclosed place (such as a closet or bookcase) without appropriate ventilation
• An uneven or sloping surface
• Exposed to chemical substances or smoke
2. Do not block vents and openings by clothes or curtains.
3. Carry the monitor carefully.
4. Do not place the monitor face down on the floor or a desk surface directly. Otherwise, scratches on the panel
surface may occur.
5. Do not place heavy loads on the monitor to avoid possible personal injury or damage to the monitor.
6. Ensure that children do not hang or climb onto the monitor.
7. Keep all packing bags out of reach of children.
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Operation
1. To protect your eyesight, please refer to the user manual to set the optimal screen resolution and the viewing
distance.
2. To reduce eye fatigue, take a break on a regular basis while using the monitor.
Avoid taking either one of the following actions for a long time. Otherwise, burn marks may occur.
• Use the monitor in the aspect ratio of 4:3, 5:4, or 16:10.
• Place a still image (such as an OSD menu, fixed text or image) on the screen.
3. To avoid possible damage to the monitor, do not touch the monitor panel by hand, pen, or any other sharp
objects.
4. Excessively frequent plug and unplug of video connectors (D-sub) may cause damage to the monitor.
5. This monitor is designed mainly for personal use. If you want to use the monitor in a public place or a harsh
environment, contact your nearest BenQ service center for assistance.
6. To avoid possible electric shock, do not dissemble or repair the monitor.
7. If a bad smell or an abnormal sound appears to come from the monitor, contact your nearest BenQ service
center for assistance immediately.
Cleaning
1. Ensure that the power is unplugged before cleaning your monitor
2. Use a monitor cleaner and a soft cloth to clean your monitor.
3. Do not use solvents such as alcohol to clean your monitor.
Power
1. To avoid possible damage to the monitor, do not use it in a region where power supply is unstable.
2. Ensure that the power cord is connected to a grounded power outlet before turning on the monitor.
3. Use only the power cord provided by BenQ.
4. Never use a power cord that appears to be damaged or frayed.
5. To avoid possible danger, observe the total electric load when using the monitor with a (multi-outlet) extension
cord.
6. Always turn off the monitor before unplugging the power cord.
2.3 Compliance Statement
Caution: This Optical Storage Product contains a Laser device. Refer to the product specifications and your local
Laser Safety Compliance Requirements.
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3. General Description
This new LCD (Liquid Crystal Display) monitor BenQ G925HDA offers numerous features and functions, for
example:
• TFT display (Thin Film Transistor; active matrix)
• Minimal space requirements thanks to slim casing
• Optimum ergonomic characteristics (totally distortion-free, excellent picture definition and color purity right into
the corners)
• Contrast ratio 20000:1, brightness 250nits
• MAX. resolution (1366x768)
• Presentation of up to 16.7 M colors (in conjunction with an appropriate graphics card)
• Automatic scanning of horizontal frequencies from 30 to 63 KHz and refresh rates (vertical frequencies) from 50
to 76 Hz (absolutely flicker-free)
• Digital screen controller with microprocessor for storing 15 different display modes
• Freely adjustable color alignment for matching the screen colors to the colors of various input and output devices
• Convenient operation via integrated OSD (On-Screen-display) menu
• VESA-DDC compatibility
• Plug & play capability
• Power management for reducing power consumption when the computer is not in use
This operating manual contains important information you require to start up and run your LCD monitor.
This specification defines the requirements for the 18.5″ MICROPROCESSOR based Multi-mode supported high
resolution color LCD monitor. This monitor can be directly connected to general 15-pin VGA connector, also
supports VESA DPMS power management and plug & play function.
Additional information
Due to the nature of liquid crystal display (LCD) technology, the picture resolution is always fixed. For the best
display performance, please set the display resolution to 1366x768 pixels with an aspect ratio of 16:9. This is called
“Native Resolution” or maximal resolution - that is, the clearest picture. Lower resolutions are displayed on a full
screen through an interpolation circuit. Image blurring across pixel boundaries can occur with the interpolated
resolution depending upon the image type and its initial resolution.
4. Related service information
This Service Manual contains general information. There are 2 levels of service:
Level 1: Cosmetic / Appearance / Alignment Service
Level 2: Circuit Board or Standard Parts Replacement
Service Web Site
eSupport URL: http://esupport.benq.com
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5. Product Overview
5.1 Monitor Specifications
G925HDA
Configuration (D-sub)
Panel / Display
Panel Type (TN / VA / IPS) TN
Panel Size 18.5"W(2 lamps)
Display Area 403.4 x 254.6
Max. Resolution 1366x768
Pixel Pitch 0.10*RGB(H)mm x 0.30(V)mm
Brightness (Typ.) 200 nits
Contrast Ratio (Typ.) / DCR (Min.) 600:1 (Panel) /40000:1 (DCR TYP)
Min :20000:1
Viewing Angle (H/V), CR≧10 90/50
Display Colors 16.7M (6bit+Hi-FRC)
Response Time 5ms (Tr+Tf)
GtG response Time N/A
NTSC ratio 0.72
Panel maker LGD
Video
BenQ SenseyeTM Technology Yes
BenQ SenseyeTM Preset Modes 5 Modes (by hotkey) : Standard / Movie /
Dynamic / Photo / s-RGB
Color Temperature Selection Normal (6500°K) / Reddish (5800°K) /
Bluish (9300°K) / User Mode
Hor. Frequency (KHz) 30~63KHz
Ver. Frequency (Hz) 50Hz~76Hz
Video Bandwidth (MHz) 110Mhz
Audio Speakers (built-in) N/A
Input/Output
PC Video Input D-sub
Audio line in No
Earphone Jack No
Power Supply
Voltage Rating AC: 100~240V (Built-in)
Power-On Mode 23W
Standby Mode <1W
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Power Off Mode <0.5W
Mechanical Design
Chassis Colors Silver Black/Black
Carton Original carton with BE flute
Power LED Green (ON)/ Amber (Standby)
Tilt (Up / Down) 20° ~ -5°
VESA Wall Mount 100 x 100mm
Kensington Lock Yes
Physical Dimension (WxHxD) TBD
Box Dimension (WxHxD) TBD
Net Weight (Esti.) TBD
Gross Weight (Esti.) TBD
Container Loading (40') 2070
Container Loading (20') 990
Multi-language Support OSD
17 Languages (English / Francais /
Deutsch / Italiano / Espanol / Polish /
Czech / Hungarian / Serbo-croatian /
Romanian / Netherlands / Russian /
Swedish / Protuguese / Japanese /
Chinese / S-Chinese)
Other feature Vista Vista Basic
Accessories VGA cable, power cord, warranty card,
quick start guide, CD manual
Regulation Approvals Refer to the worksheet "RFQ-Regulatory"
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5.2 Packing When packing the monitor into the carton, please follow the pictures as below.
1. Using the EPE bag to pack the monitor without base
2. Using the EPS to pack the monitor
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3. Putting the user manual and power cord in the position as the picture shows below.
User manual Power cord
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Level 1 Cosmetic / Appearance / Alignment Service
Visual Inspection & Cleaning • Cleaning. Always unplug your monitor from the wall outlet before cleaning. Clean the LCD monitor surface with a
lint-free, non-abrasive cloth. Avoid using any liquid, aerosol or glass cleaners.
• Slots and openings on the back or top of the cabinet are for ventilation. They must not be blocked or covered.
Your monitor should never be placed near or over a radiator or heat source, or in a built-in installation unless
proper ventilation is provided.
• Never push objects or spill liquid of any kind into this product.
Software/Firmware Upgrade Process
Hardware Requirement:
1) ISP board (715GT034-D for BenQ)
2) Printer cable(x1), VGA cable (x1), 12V DC power source
3) PC or notebook with parallel (printer) port x 1
Software Requirement:
1) PORT95NT.exe
2) Realtek_ISP_Tool 3Bank For BenQ ver4.3.exe
3) TPVDDC.exe
Step 1: Install the “PORT95NT.exe”
1. Double click the icon to install the “PORT95NT”, and then restart the computer.
Step 2: Writing the ISP data
1. Press the button 1 and connect the ISP board as follow:
Connect to PC LPT 12V DC input
Connect to the VGA port of the monitor
1
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2. Open the software “Realtek_ISP_Tool 3Bank For BenQ ver4.3.exe”, and then click “RTD 2122 ISP”
Note: The process of the ISP writing takes G2020HD for example.
3. Click “Main1: 64k”, and choose the file “BenQ G2020HD 2545LH _SEC.H00”
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4. Click “Open”, it will show the below picture
5. Click “Main2: 64~128K”, and choose the file “BenQ G2020HD 2545LH _SEC.H01”
6. Click “128~160”, and choose the file “BenQ G2020HD 2545LH _SEC_EXTEND.hex”
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7. Click , if it is successful it will show the below pictures:
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Adjustment / Alignment Procedure The Control Panel
1. “AUTO”: Adjust vertical position, phase, horizontal position and pixel clock automatically.
2. “MENU” key: Activate OSD main menu and return to the previous menu or exit OSD.
3. ◄ /Mode key: For Left/Decrease adjustment. The key is the hot key for Mode.
4. ► /Contrast/Brightness key: For Right/Increase adjustment. The key is the hot key for Brightness and Contrast.
5. “ENTER” key: Enter sub menus and select items. For models with DVI inputs, this key is also the hot key for
Input.
6. “Power”: Turn the power on or off.
OSD = On Screen Display.
The hot keys will display a graduated scale for adjusting the value of that setting, and will only operate while the
OSD menu is not currently displaying. Hot key displays will disappear after a few seconds of no key activity.
Hot Key Mode The monitor keys perform as hot keys to provide direct access to particular functions whenever the menu isn't
currently displaying on-screen.
Brightness and Contrast hot keys
Press the ► key to display the Brightness and Contrast indicators. Further press the the ◄or ► keys, then the
ENTER key to select Brightness or Contrast. The ► key will increase the level, while the ◄ key will decrease the
level.
To exit, press the MENU key.
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Mode Hot Key
Press the ◄ key continually to switch between the 6 modes for the main window, including Standard, Movie,
Dynamics, Photo, and sRGB. The setting will take effect immediately.
Input Hot Key
Press the ENTER key to toggle between different PC video signal inputs that may be connected to your monitor.
The setting will take effect immediately.
Main Menu Mode You can use the OSD (On Screen Display) menu to adjust all the settings on your monitor.
Press the MENU key to display the following main OSD menu.
There are five main OSD menus:
1. Display
2. Picture
3. Picture Advanced
4. System
Use ◄ (left) or ► (right) keys to highlight a menu item, and press the ENTER key to enter the Menu item settings.
The OSD menu languages may differ from the product supplied to your region.
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Display Menu
1. Press the MENU key to display the main menu.
2. Press ◄ or ► keys to select DISPLAY and then press the ENTER key to enter the menu.
3. Press ◄ or ► keys to move the highlight to a menu item and then press the ENTER key to select that item.
4. Press ◄ or ► keys to make adjustments or selections.
5. To return to the previous menu, press the MENU key.
Item Function Operation Range
Auto
Adjustment
Optimizes and adjusts the screen settings automatically for you.
The AUTO key is a ‘hot key’ for this function.
When you connect a digital video output using a digital (DVI) cable to your monitor, the AUTO key and the Auto
Adjustment function will be disabled.
Press the ENTER
key to select this
option and make
adjustment.
H. Position Adjusts the horizontal position of the screen image. Press ◄ or ►
keys to adjust the
value.
0 to 100
V. Position Adjusts the vertical position of the screen image. 0 to 100
Pixel Clock
Adjusts the pixel clock frequency timing to synchronize with the
analog input video signal. Not applicable to a digital input signal. 0 to 100
Phase Adjusts the pixel clock phase timing to synchronize with the
analog input video signal. Not applicable to a digital input signal. 0 to 63
Picture Menu
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1. Press the MENU key to display the main menu.
2. Press ◄ or ► keys to select PICTURE and then press the ENTER key to enter the menu.
3. Press ◄ or ► keys to move the highlight to a menu item and then press the ENTER key to select that item.
4. Press ◄ or ► keys to make adjustments or selections. 5. To return to the previous menu, press the MENU button.
Item Function Operation Range
Brightness Adjusts the balance between light and
dark shades.
Press the ► key to increase the brightness
and press the ◄ key to decrease the
brightness.
0 to 100
Contrast Adjusts the degree of difference
between darkness and lightness.
Press the ►key to increase the contrast and
press the ◄ key to decrease the contrast. 0 to 100
Sharpness Adjusts the clarity and visibility of the
edges of the subjects in the image.
Press the ► key to improve the crispness of
the display and press the ◄ key to have
softness effect on the display.
1 to 5
Color - Press ENTER to enter the Color menu.
Normal
Allows video and still photographs to
be viewed with natural coloring. This is
the factory default color.
Press ◄ or ► keys to select this option.
Bluish
Applies a cool tint to the image and is
factory pre-set to the PC industry
standard white color.
Reddish
Applies a warm tint to the image and is
factory pre-set to the news print
standard white color.
User Mode
Tailors the image color tint. The blend
of the Red, Green and Blue primary
colors can be altered to change the
color tint of the image.
Decreasing one or more of the colors
will reduce their respective influence
on the color tint of the image. (e.g. if
you reduce the Blue level the image
will gradually take on a yellowish tint.
If you reduce Green, the image will
become a magenta tint.)
Press ◄ or ► keys and the ENTER key to
select Red, Green, or Blue. Then use Press
◄ or ► keys to make the color adjustments.
• Red
(0 to 100)
• Green
(0 to 100)
• Blue
(0 to 100)
Hue: Adjustment the degree of how
we perceive colors Press ◄ or ► keys to adjust the settings. 0 to 100
Saturation: Adjust the purity degree of
colors. Press ◄ or ► keys to adjust the settings. 0 to 100
The above options for Hue and Saturation are available only if the signal source is
Component Video or HDMI.
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Reset
Color
Resets the User Mode custom color
settings to the factory defaults. Press ◄ or ► keys to adjust the settings.
YES
NO
Press MENU to leave the Color menu.
Dynamic
Contrast
(available
when the
Picture
Mode is set
to Photo,
Dynamics,
or Movie)
The function is to automatically detect
the distribution of an input visual
signal, and then to create the optimal
contrast. The higher the level, the
more detailed picture possible will be
displayed.
Press the ENTER key to select this option.
Press ◄ or ► keys to change the settings. 0 to 5
Picture Advanced Menu
1. Press the MENU key to display the main menu.
2. Press ◄ or ► keys to select PICTURE ADVANCED and then press the ENTER key to enter the menu.
3. Press ◄ or ► keys to move the highlight to a menu item and then press the ENTER key to select that item.
4. Press ◄ or ► keys to make adjustments or selections.
5. To return to the previous menu, press the MENU button.
Item Function Operation Range
Picture Mode
Selects a picture mode that best suits the type
of images shown on the screen.
• Standard - for basic PC application.
• Movie - for viewing videos.
• Dynamics - for viewing landscape-specific
videos and playing games.
• Photo - for viewing still images.
• sRGB - for better color matching
representation with the peripheral
devices, such as printers, DSCs, etc.
Press ◄ or ► keys to
change the settings.
Standard
Movie
Dynamics
Photo
sRGB
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Senseye Demo
(available when
the Picture Mode
is set to Photo,
Dynamics, or
Movie)
Displays the preview of screen images under
the selected mode from Picture Mode. The
screen will be divided into two windows; the left
window demonstrates images of Standard
mode, while the right window presents the
images under the specified mode.
Press ◄ or ► keys to
change the settings.
ON
OFF
Display Mode
This feature is provided to allow aspect ratio’s
other than 16:9 to be displayed without
geometric distortion.
• Full - Scales the input image to fill the screen.
Ideal for 16:9 aspect images.
• Aspect - The input image is displayed without
geometric distortion filling as much of the
display as possible.
Press ◄ or ► keys to
change the settings.
• Full
• Aspect
System menu
1. Press the MENU key to display the main menu.
2. Press ◄ or ► keys to select SYSTEM and then press the ENTER key to enter the menu.
3. Press ◄ or ► keys to move the highlight to a menu item and then press the ENTER key to select that item.
4. Press ◄ or ► keys to make adjustments or selections.
5. To return to the previous menu, press the MENU button.
Item Function Operation Range
Input
Use this to change the input to that
appropriate to your video cable
connection type.
Press ◄ or ► keys to change the
setting. D-sub (VGA)
OSD Settings - Press ENTER to enter the OSD Settings menu.
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Language Sets the OSD menu Language.
Press ◄ or ► keys to change the
settings.
The language options
displayed on your OSD may differ
from those shown on the right,
depending on the product supplied
in your region.
• English
• French
• German
• Italian
• Spanish
• Polish
• Czech
• Hungarian
• Serbo-Croatian
• Romanian
• Dutch
• Russian
• Swedish
• Portuguese
• Japanese
• Traditional
Chinese
• Simplified
Chinese
H. Position Adjusts the horizontal position of
the OSD menu.
Press ◄ or ► keys to change the
settings.
0 to 100
V. Position Adjusts the vertical position of the
OSD menu. 0 to 100
Display Time Adjusts the display the OSD menu. 5 / 10 / 15 / 20 /
25 / 30 sec
OSD Lock
Prevents all the monitor settings
from being accidentally changed.
When this function is activated, the
OSD controls and hotkey
operations will be disabled.
Press ◄ or ► keys to change the
settings.
To unlock the OSD controls
when the OSD is preset to be
locked, press and hold the
"MENU" key for 15 seconds to
enter the "OSD Lock" option and
make changes.
Alternatively, you may use ◄ or ►
keys to select "NO" in the "OSD
Lock" submenu from the "OSD
Settings" menu, and all OSD
controls will be accessible.
YES
NO
Press MENU to leave the OSD Settings menu.
DDC/CI* Allows the monitor settings to be
set through the software on the PC.
Press the ENTER key to select
this option. Press ◄ or ► keys to
ON
OFF
18.5″ LCD Color Monitor BenQ G925HDA
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change the settings.
Information Displays the current monitor
property settings.
Press the ENTER key to select
this option.
Reset All
Resets all mode, color and
geometry settings to the factory
default values.
Press ◄ or ► keys to change the
settings.
YES
NO
*DDC/CI, short for Display Data Channel/Command Interface, which was developed by Video Electronics
Standards Association (VESA). DDC/CI capability allows monitor controls to be sent via the software for remote
diagnostics.
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Display Timing Table
Pixel Format
Hor.
Frequency
(kHz)
Ver.
Frequency
(Hz)
Pixel Clock
(MHz) Source
640 x 350 31.47 70.09 25.18 VGA
640 x 480 31.47 59.94 25.175 VGA
640 x 480 37.50 75.00 31.500 VGA
720 x 400 31.47 70.08 28.321 VGA
800 x 600 37.88 60.32 40.000 VESA
800 x 600 46.88 75.00 49.500 VESA
832 x 624 49.72 74.55 57.283 MAC
1024 x 768 48.36 60.00 65.000 VESA
1024 x 768 60.02 75.03 78.750 VESA
1024 x 768 68.68 85.00 94.500 VESA
1152 x 720 44.86 60.00 66.750 CVT 0.83MA, DVT 16:10
1152 x 870 68.68 75.06 100.000 MAC
1152 x 900 61.80 65.96 92.978 SUN
1280 x 768 47.396 60.0 68.25 CVT 0.98M9-R
1280x800 49.702 59.81 83.5 CVT-8
1280x800 62.8 75 106.5
1280x720 45.00 59.94 74.25
1280x720 44.77 59.86 74.5
1280x720 56.46 74.78 95.75
1280 x 960 60.00 60.00 108.000 VESA
1280 x 1024 63.98 60.02 108.000 VESA
1280 x 1024 79.98 75.02 135.000 VESA
1280 x 1024 91.15 85.02 157.500 VESA
1360x768 47.7 60.01 85.5 VESA
1366x768 47.76 59.85 85.5
1440 x 900 55.94 59.89 106.500 CVT 1.30MA
1440x900-R 55.94 59.89 88.75
1440 x 900 70.6 75 136.75
• Image disruption may occur as a result of signal frequency differences from graphic cards which do not
correspond with the usual standard. This is not, however, an error. You may improve this situation by altering an
automatic setting or by manually changing the phase setting and the pixel frequency from the “DISPLAY” menu.
• To extend the service life of the product, we recommend that you use your computer's power management
function.
18.5″ LCD Color Monitor BenQ G925HDA
26
Factory OSD Menu Turn off the monitor, keep pressing the “MENU” buttons, and turn on the monitor, then when we press the MENU
button, the factory OSD will be at the left top of the panel as below (takes E2220HD for example):
BenQ Service Page
1. Trigger method: press “Menu” key and Power on.
2. Press the menu key will display the service page
3. Press the menu key will close the service page.
4. Power off will quit the service mode
5. At the service mode, the key function is same as normal OSD define.
6. The timer can only reset at the service mode by “Timer Reset” (Timer Reset moves to SI factory Area). And
need to have a warning message to double confirm the reset function. The timer should record up to 99999
hours and will be reset once launch.
7. Add two selected items for DVI HDCP at Service menu HDMI HPD: To enable the hot plug pin detection. (HDMI port default: On)
DVI HDCP: To disable the hot plug pin detection. (DVI port default: on)
8. Add BenQ logo on/off item, the default is “on”
9. Add the auto power on item, the default is “off ”
10. Add the timer reset warning message, when select the timer reset item, then the warning message will display
and need to confirm it again and the default is “No”.
11. Panel type define need to have the panel version.
12. F/W version need to define the dual or analog model.
18.5″ LCD Color Monitor BenQ G925HDA
27
Level 2 Circuit Board and Standard Parts Replacement
Product Exploded View
Note: The parts information listed below are for reference only, and are subject to change without notice. Please
go to http://cs.tpv.com.cn/hello1.asp for the latest information.
Item Part NO. Description QTY Unit
1 Q34G0543ADP 3B0100 BEZEL(L185W-9benq) 1 PCS
2 Q33G0288 2 1C0100 LENS 1 PCS
3 Q33G0287ADP 1L0100 KEY PAD 1 PCS
4 Q15G0405801 MAINFRAME 1 PCS
5 Q34G0544ADP EB0130 REAR COVER18.5" 1 PCS
6 Q33G0289ADPA1L0100 LOGO COVER 1 PCS
7 Q34G0545ADP 1B0100 Stand-Front 1 PCS
8 Q37G0125011 hinge 1 PCS
9 Q34G0546ADP 1B0130 Stand-Back 1 PCS
10 A33G0251ADP 2L0100 CABLE CLIP 1 PCS
11 Q34G0547ADP 1B0101 BASE 1 PCS
12 Q12G6082 1 FOOT PAD 1 PCS
13 Q23G3178881 1A LOGO for black 1 PCS
14 P15G8299 3 BKT-VESA 1 PCS
15 750GLU185X1854N000 PANEL M185XW01 V80D SH AUO 1 PCS
16 715G3327M02001004S MAIN BOARD 1 PCS
18.5″ LCD Color Monitor BenQ G925HDA
28
18 715G2852 3 4 POWER BOARD 1 PCS
19 715G3367 2 KEY BOARD 1 PCS
SCREW
Item Part NO. Description QTY Unit
S1 0M1G 130 6120 PANEL& MAINFRAME 3 PCS
S2 0M1G1030 6120 PCB & MAINFRAME 4 PCS
S3 AQ1G1740 12120 HINGE & STAND 2 PCS
S4 0M1G1740 8 47 CR3 HINGE & STAND 1 PCS
S5 AM1G1740 12 47 CR3 HINGE & STAND&MAINFRAME 2 PCS
ART.
Part NO. Description QTY. Unit
Q44G8015101 EPS 1 PCS
Q44G8015201 EPS 1 PCS
Q44G8015624 1A CARTON 1 PCS
18.5″ LCD Color Monitor BenQ G925HDA
29
Six Angles’ View
18.5″ LCD Color Monitor BenQ G925HDA
30
Product Disassembly
1) Remove the base
Place the monitor face down on a smooth surface. Be careful to avoid scratch and injury during the process of
uninstall. And then remove the base.
2) Remove the stand
Be careful to avoid scratch and injury during the process of uninstall. And then remove the screws in red to remove
the base.
18.5″ LCD Color Monitor BenQ G925HDA
31
3) Remove the rear cover
Remove the rear cover as follow:
18.5″ LCD Color Monitor BenQ G925HDA
32
4) Remove the key board from the bezel.
5) Remove the main frame from the panel.
18.5″ LCD Color Monitor BenQ G925HDA
33
6) Remove the boards from the main frame.
7) The panel
18.5″ LCD Color Monitor BenQ G925HDA
34
Block Diagram
Main Board
OSD Control
Interface
(CN401)
MCU
MTV416GMV
(U402)
Crystal 24.576MHZ
(X401)
D-Sub Connector
(CN301)
H sync
V sync
RGB
Panel Interface
(CN601)
Key Control Interface
(CN202)
Crystal 24MHZ
(X401)
Scalar IC RTD2035L
(U501) MCU RTD2122L-LF
(U401)
DDC1_SCL
DDC1_SDA
18.5″ LCD Color Monitor BenQ G925HDA
35
Power Board
DIM
EMI filter
Start Circuit: R904, R932, R933
PWM Control IC
Transformer AC input
12V
ON/OFF Control Feedback
Circuit
Transformer MOSFET
Lamp
ON/OFF
5V
Bridge Rectifier and Filter
Feedback Circuit
Rectifier diodes
CN902
Output Circuit
PWM
Control IC
(IC801) Over Voltage
18.5″ LCD Color Monitor BenQ G925HDA
36
Schematic Diagram Main Board
Volume# {4}
LED_R
LED_G# {4}
FB202
NC
Volume#
C2100.1uF/16V
* BKLT-EN High ON(3.3V)
DIM# {4}
PANEL_ID# {4}
R207120R 1/16W
C206
0.1uF/16V
T89ARPMCFWBQNN 1.0
BenQ G922HDAL B
3 7Wednesday , December 16, 2009
715G2498-2A-AO<称爹>
3.POWER
G2498-2A-AO-X-16-091216
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
+ C203100UF25V
CMVCC
Mute {4}
INV_ON# {4}
C201
0.1uF/16V
KEY1 {4}
ZD201NC
12
R208120R 1/16W
ZD203NC
12
BKLT-VBRI
R201200 1 / 1 6 W
Near to Connect
KEY1
FB201
120
Panel ID(3.3V PWM)
CMVCC
Back lightDimming(3.3V PWM)
MVCC
Mute
R2024K7 1/16W
BKLT-EN
C_PANEL_INDEX
VCC3
LED_G
Q205PMBS3906
CN201
CONN
123456789
C209
0.1uF/16V
CMVCC
U201
AP1117E33LA
1
23
VS
S
VOUTVIN
CMVCC
LED_G
Q202PMBS3904
VCC3
R210 10K 1/16W LED_R# {4}KEY0 {4}
C204
0.1uF/16V
R213 10K 1/16W
C205
0.1uF/16V
VCC3
+C202
100UF25V
LED_R
POWER_KEY#
Q204PMBS3906
ZD202
NC
12
CN202
CONN
123456
KEY0
POWER_KEY# {4}
BKLT-EN
18.5″ LCD Color Monitor BenQ G925HDA
37
VGA_B-
R426 22R 1/10W 5%
C3085pF/50V
R3052.2K 1 / 1 6 W
VGA_G+
ZD305
RLZ5.6B
12
R306 100R 1/16W
C302
22pF
VGA_R+ZD307
RLZ5.6B
12
RTD_G- {5}
R318200R 1/10W 5%
C309
0.047uF
RTD_G-
VGA_B+
C301
0.047uF
VGA_G-V
GA
_B+
R311 100R 1/16W
R310
75R 1/16W
R3042.2K 1 / 1 6 W
C3055pF/50V
R312 100R 1/16W
CN301
DB15
162738495
11
12
13
14
1510
1716
DSUB_V
R313 100R 1/16W
RTD_G+
RTD_B+
R428 22R 1/10W 5%
RTD_G+ {5}
VGA_G-
R309 100R 1/16W
C303
22pF
CMVCC
DDC1_SCL{4}
DDC1_SDA{4}
RTD_B- {5}
RTD_V {5}
VGA_B-
C306
0.047uF
VGA_R-
RTD_H {5}
C307
0.047uF
C4140.1uF/16V
R316200R 1/10W 5%
VGA_R+
C316
0.1uF/16V
VGA_CONV
GA
_R+
R315 100R 1/16W
VGA_B+
C311
0.047uF
RTD_R-
FB303
BEAD1 2
R317200R 1/10W 5%
R303 100R 1/16W
C4130.1uF/16V
C315
0.1uF/16V
RTD_B+ {5}
DSUB_5V
D303BAV99
3
12
FB302
BEAD1 2
FB301
BEAD1 2
DSUB_CONNECT {4}
VGA_R-
D302BAV99
3
12
ZD301
RLZ5.6B
12
DSUB_5V
VGA_G+
D301BAV99
3
12
ZD304
RLZ5.6B
12
T89ARPMCFWBQNN 1.0
BenQ G922HDAL B
4 7Wednesday , December 16, 2009
715G2498-2A-AO<称爹>
4.INPUT
G2498-2A-AO-X-16-091216
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
ZD303
RLZ5.6B
12
RTD_B-
RTD_R+
ZD302
RLZ5.6B1
2
DSUB_H
RTD_R- {5}
R320 100R 1/10W 5%
R307
75R 1/16W
C317
0.1uF/16V
RTD_R+ {5}
C3105pF/50V
R301 100R 1/16W
R319 100R 1/10W 5%
DSUB_V {4}
R314
75R 1/16W
R308 100R 1/16W
VG
A_G
+
C304
0.047uF
18.5″ LCD Color Monitor BenQ G925HDA
38
Mute
DSUB_CONNECT {3}
R4021K 1/16W
KEY1
R420 100R 1/16W
R415
6K8 1/16W
MCU_VCC
PANEL_ID#
DSUB_V1
1
C404
NC
Volume#{2}
CMVCC
PPWR_ON#
KEY1 {2}
R405
NC
D402BAV70
R40410K 1/16W
R434 100R 1/16W
R4114K7 1/16W
T89ARPMCFWBQNN 1.0
BenQ G922HDAL B
5 7Thursday , December 17, 2009
715G2498-2A-AO<称爹>
5.MCU/RTD2122
G2498-2A-AO-X-16-091216
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
RTD_SCLK
R423 1K 1/16W
PANEL_VCC
R4396K8 1/16W
VCC3
PANEL_ID#{2}
WP
Q401PMBS3904
R41610K 1/16W
R433 100R 1/16W
R410 NC
MCU_VCC
LED_G#{2}
MVCC
R424 1K 1/16W
IICSDA
D401BAT54C(NC)
1
3
2
CMVCC
DSUB_V {3}
KEY0 {2}
R422 100R 1/16WMute{2}
PPWR_ON#{6} R430 100R 1/16W
RTD_SD3/SDI {5}
MCU_VCC
X40124mhz
1 2R436
10K 1/16W
R454
1K 1/16W
MCU_VCC
RTD_SD3/SDI
R435 100R 1/16W
DSUB_CONNECT
C409NC(22pF/16V)
IICSCL
R4124K7 1/16W
R451
4K7 1/16W
DSUB_V
3
R431
6K8 1/16W
U401
RTD2122L-LF
123
4
5
6 7
8
1715
41 40 39 38 37 36 35 34 33
19
28
29
2021222324252627
16
91011121314
18
303132
4342
4445464748
P5.5/PWM5DSCL2/P5.6DSDA2/P5.7
RS
T
ASCL1/P3.0/RXD
NC
NC
ASDA1/P3.1/TXD
VS
S
XO
VC
C
P1.
0/T
2P
1.1
P1.
2P
1.3
P1.
4P
1.5
P1.
6P
1.7
NC
VSYNC
NC
P6.0/ADC0P6.1/ADC1P6.2/ADC2P6.3/ADC3
P6.4P6.5
P6.6/CLKO1P6.7
XI
P3.2/INT0P3.3/INT1P3.4/T0P3.5/T1P7.6/CLKO2P7.7
NC
NCNCNC
NC
NC
P5.0/PWM0P5.1/PWM1P5.2/PWM2P5.3/PWM3P5.4/PWM4
C40110pF
C402
NC
IICSCL
LED_R#{2}KEY0
R408 NC
Closed to X'tal
DDC1_SDA
POWER_KEY#
DIM#{2}
INV_ON#
R429 0R05 1/16W
POWER_KEY# {2}
R4383.9K OHM +-1% 1/16W
R413
4K7
1/16
W
2
DSUB_5V
Volume#
R432 100R 1/16W
BAT54C
C4030.1uF/16V
R42510K 1/16W
U403
NC
1234 5
678
NCNCNCVSS SDA
SCLWC
VCC
R427 NC/0R05 1/16WDDC1_SCL{3}
R409 NC
MCU_VCC
R414
4K7
1/16
W
C4100.1uF/16V
R407
NC
WP
CRYSTAR_OUT
R406
NC
C406
0.1uF/16V
C41110pF
MCU_VCC
RTD_SCLK {5}
INV_ON#{2}
LED_G#
DDC1_SDA{3}
IICSDA
R4033.9K 1 / 1 6 W
DIM#
R4373.9K OHM +-1% 1/16W
R401
3.9K OHM +-1% 1/16W
C412
1uF 10V
CRYSTAR_OUT {5}
MCU_VCC_S
Closed to MCU
LED_R#
DDC1_SCL
+ C40510UF50V
MCU_VCC_S
R453
1K 1/16W
U402AZ431AN-AE1
18.5″ LCD Color Monitor BenQ G925HDA
39
RT
D_S
CLK
{4}
DG
ND
RXE0-
R1.8DVCC
RXOC-
RTD_B+
DG
ND
RXOC+
RXE2-
RTD_G+{3}
RTD_B+{3}
LVDS_E5
VCC3
LVDS_E6
Q502
MMBT2907AK
VCC3
RX
E3-
CR
YS
TA
R_O
UT
{4}
RX
E2-
RXEC+
Q501MMBT2907AK
BJT
_B
+C505
22UF50V
LVDS_E0
DGND
RT
D_G
-
RXOC+
RXE1+
LVDS_E2RXE0+
BJT
_B
RT
D_S
D3/
SD
I{4
}
RT
D_R
-
C5030.1uF/16V
LVDS_E8
RXE1-
LVDS_E7
RXE3+
C506
0.1uF/16V
DGND
LVDS_E4
RTD_G-{3}
CR
YS
TA
R_O
UT
LVDS_E[0..9] {6}
R1.
8DV
CC
RTD_R-{3} R1.8DVCC
RX
E3+
TM
DS
_VD
D
RX
E2+
RXEC-
RT
D_R
+
RT
D_G
+
C507
0.1uF/16V
RXE0-RTD_H
RT
D_S
D3/
SD
I
RXE2+
RXE1+
RTD_V{3}
FB502120
1.8AVCC
RTD_V
LVDS_E3
RTD_B-{3}
LVDS_E1
FB503120
C501
0.1uF/16V
RXE1-
R1.
8DV
CC
RXOC-
R507 3.3 2 W
RXE0+
RT
D_S
CLK
RTD_R+{3}
RTD_B-
RTD_H{3}
R1.
8DV
CC
LVDS_E9
T89ARPMCFWBQNN 1.0
BenQ G920HDAL B
6 7Wednesday , December 16, 2009
715G2498-2A-AO<称爹>
6.RTD2035L
G2498-2A-AO-X-16-091216
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
RXE3-
U501
RTD2035L
1
2
3
4
5
6
7
8
9
10
11
12
13 14 15 16 17 18 19 20 21 22 23 24
36
35
34
33
32
31
30
29
28
27
26
25
48 47 46 45 44 43 42 41 40 39 38 37
V1/REXT
V2/RX1P
V3/RX1N
V4/RX0P
V5/RX0N
V6/RXCP
V7/RXCN
AVS
AHS
ADC_GND
B-
B+
G-
G+
R-
R+
AD
C_V
DD
BJT
_B
VC
CK
PG
ND
TX
E3+
TX
E3-
TX
E2+
TX
E2-
TXO1-
TXO1+
TXO2-
TXO2+
TXOC-
TXOC+
TXO3-
TXO3+
TXE0-
TXE0+
TXE1-
TXE1+
V0/
RX
2N
VC
LK/R
X2P
TM
DS
_VD
D
XIN
DD
CS
CL/
PW
M0
DD
CS
DA
/PW
M1/
IRQ
SC
L
SD
A
VC
CK
PG
ND
TX
O0-
TX
O0+
18.5″ LCD Color Monitor BenQ G925HDA
40
C602
0.01uF/25V
RXE0-
FB601
120
LVDS Panel ( Normal Type )
RXE3+
RXE1+
T89ARPMCFWBQNN 1.0
BenQ G920HDAL A
7 7Thursday , December 17, 2009
715G2498-2A-AO<称爹>
7.OUTPUTG2498-2A-AO-X-16-091216
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
CMVCC
RXE3+
D
R606NC(R0805)
RXE1+
C603
0.1uF/16V
3
PANEL_VCC
LVDS_E4 R602330R 1/8WRXE2+
RXE3-
LVDS_E9
RXEC-
RXEC-
RXE0+
PANEL_VCC
RXE0-
AO3401LR603NC
PANEL_VCC
PPWR_ON#
RXE1-
1
LVDS_E1
LVDS_E7
CN601
CONN
2468101214
13579
1113
PPWR_ON#{4}
LVDS_E[0..9]{6}
Q601AO3401
S
RXE3-
G
2006-11-7 Add pull up 4K7 to MVCC
LVDS_E3
RXE2+
RXE0+
RXE1-
+ C60447UF25V
2
RXEC+
R6054K7 1/16W
LVDS_E2
Q602
PMBS3906
LVDS_E5RXE2-
RXEC+
R601
10K 1/16W
LVDS_E0
LVDS_E6
RXE2-
R604
47K1/16W
LVDS_E8
18.5″ LCD Color Monitor BenQ G925HDA
41
Power Board
12
ZD902RLZ13B
12
HS2HEAT SINK(D906_Q90G6263-6)
D915LL4148
78
910
1112
4
5
6
1
2
T901
POWER X'FMR
D916LL4148
+12V
+5V
F904
NC
C9120.001uF
F902
NC
!
R962 100 OHM 1/4W
R920100 OHM 1/4W
R946150 OHM 2W
C910NC
R922NC
R923NC
D907 NC
R921NC
!
12
HS3HEAT SINK(Q901_Q90G6263-6)
R93810K 1/8W
!
VAR901Varistor
C909470pF/25V
R91010R 1/4W
!
R9140.47 OHM +-5% 2WS
R912
220 OHM 1/4W
!
12
ZD905RLZ18B
R9273.6K OHM 1% 1/10W
C9021000pF
!
t
NR901NTCR
F903
NC
R9095.1 OHM 1/4W
!
R9302.43K OHM 1% 1/10W
C9280.01uF
12
GND1GND
!
!
C9110.1uF
+ C907100uF450V
D901FR103
R90410K OHM 1/4W L905
NC
R908
100KOHM +-5% 2WS
D900FR107
C9011000pF
R915100K OHM 1% 1/8W
R9251K 1/8W
+C921NC
!
R94033K 1/10W
12
ZD921RLZ13B
R9421K 1/10W 1%
12
ZD922RLZ5.1B
Wednesday , Nov ember 26, 2008
D903LL4148
12
ZD923NC
12
HS5SHIELD(H85G0002-1)
+5V1
C932
0.001uF
R9391K 1/8W
Q903PMBS3904
R943470R 1/8W
Q9012SK2645-54MR
+ C939NC
N.C
F905
0 OHM 1/4W
!
!
C938NC
C9061500pF2KV
!
R900
680K OHM 1/4W
R902
680K OHM 1/4WR901
680K OHM 1/4W
R93210K OHM 1/4W
!
!
!
+ C9401000UF25V
C930
0.1uF
! R948NC
C908
0.22UF
12
43
IC902PC123X2YFZOF
R924150R 1/8W
+C917
680uF/25V
D905 31DQ06FC3
+C915
470uF/16V
IC903AZ431AZ-AE1
R961 100 OHM 1/4W
R935 100 OHM 1/4W
+ C90322uF/50V
L903
1.0uH
Q904NC
C9290.001uF
R952NC
1 4
2 3
L901
30mH
C925
NC
12
3
CN901
87G 501 32 SSOCKET
R947NC
R918100 OHM 1/4W
R919100 OHM 1/4W
C9240.1uF
C9003300pF 250V
R907NC
R9261K 1/10W 1%
R906NC
R905NC
+5V
C9310.1uF
123456789
10
CN902
CONN
ON/OFFDIM
MUTE
VOL
L904
1.0uH
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹 A
Custom
1 2715G2852 3 41.POWER
G2852-A-4-X-5-081126
+C918680uF/25V
RT1
COMP2
CS3
GND4
OUT5VCC6NC7HV8
IC901
LD7575A PS
1
2
3D906
FCH10U10
+ C922470PF50V
C904
0.22UF
2
1
3
4-
+
BD901KBP208G
F901FUSE
18.5″ LCD Color Monitor BenQ G925HDA
42
D817LL4148
R82922R 1/8W
R8221K 1/8W
C8210.1uF/25V
R83747K 1/8W
D812
LL4148
R8311K 1/8W
R8028.2K 1/10W 1%
R830NC
+12V
C8221uF/25V
R83210K 1/10W 1%
Q805PDTC144WK
C820220pF50V
R80810K 1/10W 1%R820
10K 1/10W 1%
C8190.0022uF
R81710K 1/10W 1%
D805LL4148
3
1
2
D801BAV99
R8516K8 1/10W
+C802
470PF50V
1IN+1
1IN-2
FEEDBACK3
DTC4
CT5
RT6
GND7
C18
E19E210C211VCC12OUTPUT CTRL13REF142IN-152IN+16
IC801TL494IDR
R82810K 1/10W 1%
3
1
2
D802BAV99
C8230.0022uF
D807LL4148
Q809RK7002
D806LL4148
D811NC
R803680K 1/10W
R83922R 1/8W
R85022R 1/8W
Q811PMBS3904
1
23
Q812PMBS3906
Q807N.C
R804100R 1/8W
R81051K OHM 1% 1/8W
R86310K 1/10W 1%
C80330pF/3KV
R8230R05 1/10W 5%
R8261K 1/8W
D810NC
R80710K 1/10W 1%
DIM
ON/OFF
R8351M 1/10W 5%
12
CN801
CONN
C8420.01uF
C8340.1uF/25V
R8271K 1/10W 1%
F801
0 OHM 1/4W
R824
1K 1/10W 1%
S1
G2
S3
G4
D8
D7
D6
D5
Q802AM9945N-T1-PF
R8181K 1/10W 1%
Q808PDTA144WK
R8621M 1/10W 5%
R82522R 1/8W
C817NC D814
LL4148
C8381500PF/50V
C8070.1uF/25V
C846NC
R865
NC
R864NC
C835NC
Q801PMBS3904
Q806PMBS3904
12
CN802
CONN
R85368K 1/10W
R8141K5 1/10W 1%
1
23
Q804PMBS3906
C8250.1uF/25V
C8391500PF/50V
C80130pF/3KV
R8011K5 1/10W 1%
R854NC
R84168K OHM 1% 1/10W
R861NC
C8452.2uF/16V
R8211K 1/8W
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹 A
Custom
2 2
715G2852-3-4ODM MODEL
2.INVERTER
G2852-A-4-X-5-081126
C8240.1uF
R85615R 1/4W
6
3
7
4
81
T801POWER X'FMR
R85515R 1/4W
Wednesday , Nov ember 26, 2008
18.5″ LCD Color Monitor BenQ G925HDA
43
Key Board
C00
80.
1uF
GNDGND
EN
TE
R
LED_RED#
C00
70.
1uF
DC_POWERON
C002
NC/0.001uF
GND
GND GND GND
PO
WE
R
C01
00.
1uF
C01
10.
1uF
GND
R002 3K 1 / 1 0 W
GND
C00
60.
1uF
GND
ZD
001
NC
LEF
T
C003
NC/0.001uF
CN001
Wire Harness
123456
SW003
SW003
21
3 4
5
ZD
002
NC
R003 1K 1/10W 1%
SW001
SW001
21
3 4
5
LED_RED#
GND
AU
TO
GND
RIG
HT
R006 1K 1/10W 1%
LED001LED
231
GND
SW005
SW005
21
3 4
5
ZD
004
NC
LED_GRN#
ZD006
NC
R007 3K 1 / 1 0 W
LED_GRN#
ZD
003
NC
SW002
SW002
21
3 4
5
R005 3K 1 / 1 0 W
C005
NC/0.001uF
ZD
005
NC
SW006
SW006
21
3 4
5
C001
NC/0.001uF
SW004
SW004
21
3 4
5
R004 1K 1/10W 1%
LBADC2
B
C00
90.
1uF
ME
NU
C004
NC/0.001uF
GND
C
2 2Wednesday , December 03, 2008
715G3367-C<称爹>02.KEY BOARD
G3367-C-X-X-1-081013
OEM MODEL Size
Rev
Date Sheet of
TPV MODEL
PCB NAME称爹
T P V ( Top Victory Electronics Co . , Ltd. )
Key Component
絬 隔 瓜 絪 腹
LBADC1
18.5″ LCD Color Monitor BenQ G925HDA
44
Troubleshooting
Frequently asked questions (FAQ)
The image is blurred: Read the instructions on the link "Adjusting the Screen Resolution" on the CD, and then select the correct
resolution, refresh rate and make adjustments based on these instructions.
How do you use a VGA extension cable? Remove the extension cable for the test. Is the image now in focus? If not, optimize the image by working
through the instructions in the "Adjusting the refresh rate" section on the link "Adjusting the Screen
Resolution". It is normal for blurring to occur due to conduction losses in extension cables. You can minimize
these losses by using an extension cable with better conduction quality or with a built-in booster.
Does the blurring only occur at resolutions lower than the native (maximum) resolution? Read the instructions on the link "Adjusting the Screen Resolution" on the CD. Select the native resolution.
Pixel errors can be seen: One of several pixels is permanently black, one or more pixels are permanently white, one or more pixels are
permanently red, green, blue or another color.
• Clean the LCD screen.
• Cycle power on-off.
• These pixels are permanently on or off and that is a natural defect occurs in LCD technology.
The image has a faulty coloration: It has a yellow, blue or pink appearance.
Select MENU > PICTURE > Color > Reset Color, and then choose “YES” in the “Caution” message box to
reset the color settings to the factory defaults.
If the image is still not correct and the OSD also has faulty coloration, this means one of the three primary
colors is missing in the signal input. Now check the signal cable connectors. If any pin is bent or broken off,
please contact your dealer to get necessary support.
No image can be seen: Is the prompt on the display illuminated in green?
If the LED is illuminated in green and there is a message “Out of Range” on the screen, this means you are
using a display mode that this monitor does not support, please change the setting to one of the supported
mode. Please read the “Preset display modes” section from the link "Adjusting the Screen Resolution".
Faint shadow from the static image displayed is visible on the screen: • Activate the power management function to let your computer and monitor go into a low power "sleep"
mode when not actively in use.
• Use a screensaver to prevent the occurrence of image retention.
18.5″ LCD Color Monitor BenQ G925HDA
45
Is the prompt on the display illuminated in orange? If the LED is illuminated in orange, the power management mode is active. Press any button on the computer
keyboard or move the mouse. If that does not help, check the signal cable connectors. If any pin is bent or
broken off, please contact your dealer to get necessary support.
Is the prompt on the display not illuminated at all? Check the power supply mains socket, the external power supply and the mains switch.
The image is distorted, flashes or flickers: Read the instructions on the link "Adjusting the Screen Resolution" on the CD, and then select the correct
resolution, refresh rate and make adjustments based on these instructions.
You are running the monitor at its native resolution, but the image is still distorted. Images from different input sources may appear distorted or stretched on the monitor running at its native
resolution. To have the optimal display performance of each type of input sources, you can use the "Display
Mode" function to set a proper aspect ratio for the input sources.
The image is displaced in one direction: Read the instructions on the link "Adjusting the Screen Resolution" on the CD, and then select the correct
resolution, refresh rate and make adjustments based on these instructions.
The OSD controls are inaccessible: • To unlock the OSD controls when the OSD is preset to be locked, press and hold the “MENU” key for 15
seconds to enter the “OSD Lock” option and make changes.
• Alternatively, you may use or keys to select “NO” in the “OSD Lock” submenu from the “OSD Settings” menu (under SYSTEM), and all OSD controls will be accessible.
If your problems remain after checking this manual, please contact your place of purchase or e-mail us at:
18.5″ LCD Color Monitor BenQ G925HDA
46
No Power
OK
NG
No power
Check power cable is tightened?
Check Power “On/Off”
is “On”?
Re-plug the power cable
Replace main board and check connections
Check the LED
indicates is OK? Check the AC power
Replace the converter board
OK
NG
OK
NG
NG
Turn on the Power “On/Off” switch
Replace key board and check connections
NG
18.5″ LCD Color Monitor BenQ G925HDA
47
No Video (Power LED Green)
No Video (Power LED Green)
Press the power
button is OK?
Check the LVDS/FFC
cable or panel
The end
NG
OK
OK
NG
Replace the main board
Replace the converter
board
Replace the LVDS/FFC
cable or panel
NG
The end
Replace the key board
NG
OK
Replace the main
board and connection
OK
18.5″ LCD Color Monitor BenQ G925HDA
48
DIM
OK The end
OK The end
OK The end
DIM (image overlap, focus or flicker)
Reset in factory mode
Set to the optimal frequency, select the recommended frequency
Pull out signal cable and check “Self Test Feature
Check” is ok?
Check the signal cable
and the PC
Readjust the phase and pixel
clock in the user mode
Replace the main board
Replace the panel
NG
NG
NG
OK
NG
NG
OK The end
OK
NG
18.5″ LCD Color Monitor BenQ G925HDA
49
Color is not optimal
NG
Color is not optimal
Miss color Color shift
Replace the signal cable
Pull out the signal cable and check the screen
color display is normal?
The end
Replace the signal cable or PC
Reset the factory mode
In the user mode, set the” color
settings” until customer satisfy
Replace the main board
NG
OK
NG OK
NG
18.5″ LCD Color Monitor BenQ G925HDA
50
PCB LAYOUT
Main Board
18.5″ LCD Color Monitor BenQ G925HDA
51
18.5″ LCD Color Monitor BenQ G925HDA
52
18.5″ LCD Color Monitor BenQ G925HDA
53
Power Board
18.5″ LCD Color Monitor BenQ G925HDA
54
18.5″ LCD Color Monitor BenQ G925HDA
55
18.5″ LCD Color Monitor BenQ G925HDA
56
Key Board
18.5″ LCD Color Monitor BenQ G925HDA
57
Appendix 1 – Screw List / Torque
(T8AARPD8FWBUNN)
Part No. Type Description Quantity Torque
0M1G 130 6120 M3*6 PANEL& MAINFRAME 3 3 ± 0.5kgf.cm
0M1G1030 6120 M3*6 PCB & MAINFRAME 4 6 ± 1kgf.cm
AQ1G1740 12120 Q4*12 HINGE & STAND 2 12 ± 2kgf.cm
0M1G1740 8 47 CR3 M4*8 HINGE & STAND 1 6 ± 1kgf.cm
AM1G1740 12 47 CR3 M4*12 HINGE & STAND&MAINFRAME 2 6± 1kgf.cm