4.3.1 power circuit diagram 4.3.1.1 power-on trouble +2.6v msmp2 u503 4.3 logic part trouble u502...
TRANSCRIPT
4.3.1 Power
Circuit Diagram
4.3.1.1 Power-On Trouble
+2.6V MSMP2
U503
4.3 Logic Part Trouble
Test Point
U502
+1.4V_ MSMC
+2.6V_ MSMP2
+1.8V_ MSMP1
+2.9V_ RX0
+2.8V_ TCXO
+2.9V_ RX1
+2.6V_ MSMA
Checking Flow
START
YES
Check Battery Voltage> 3.4V ?
NOCharge of Change Battery and try again
Replace the U502
Re-download software & try again
The power-on procedure is completed.The problem may be elsewhere.
The Phone will power on. Replace the main board.
Check the contact of power-keyor dome switch
Push power-on key and check the level change of
U502 PWR_ON
Check the voltage Level of the following port at U502
+1.4V_MSMC+2.6V_MSMP2+1.8V_MSMP1+2.6V_MSMA+2.8V_TCXO
+2.9V_RX
The logic level at PS_HOLD(R502) of U502 = High ?
Does it work properly?Does it work properly?
YES
YES
YES
YES
NO
NO
NO
NONO
YES
Circuit Diagram
4.3.1.2 Charging Trouble
Test Points
V_CHAR
C605
VBATT(+VPWR)
Q603 Pin1 CON603
Q600
Q601
Q602
Checking Flow
SETTING : Connect the battery and the charging adaptor (TA) to the phone
START
YES
Voltage at +V_CHARof Q601 = 5V?
NO The charging adaptor (TA) is out of order.Change the charging adaptor.
Replace Q600, Q601Voltage at C605 = 5V?
Voltage at +VPWRof Q603 = 4.2V?
YES
YES
YES
NO
NO
YES
Replace Q603
The logic level at CHG_MODEof Q602 = Low?
NOReplace Q602
Is the batterycharged
NOThe battery may have the problemChange the battery and try again.
Charging will operate properly
YES
4.3.2 LCD
Circuit Diagram
4.3.2.1 LCD Trouble
Test Points
• LCD Control signals
From MSM : D2[0:15], MLCD_REST/, SLCD_RESET/,
MLCD_CS/, SLCD_CS/, WE2/, RS
F404F406
F408
F409
F407
F403
F405
CON400
U502
+2.8V_LCD
• Check point
- The assembly status of the LCD Module
- The Soldering of connector
START
Voltage at +2.8V_LCDof U502 = 2.8V?
Check theControl signal
D2[0:15], RESET/,LCD_CS/, WE2/,RS
Change the LCD Module
No
No
Yes
Yes
Yes
Replace U502
Check CON400 soldering Re-solder CON400
Yes
Checking Flow
; Check F403, F404, F405, F406, F407, F408, F409
4.3.3 Camera
Circuit Diagram
4.3.3.1 Camera Trouble
• Camera Control signals
From MSM : CAM_DATA[0:7], CAM_REST/, CAM_SDA, CAM_SCL,
CAM_CLK_IN, CAM_PCLK
Test Points
VR603
CON601
• Check point
- The assembly status of the Camera Module
- The Soldering of connector
U503
X400
L400
VR600 VR601 VR602
U505
START
Check the clock to Camera at L400(48MHz)
Check the clock from Cameraat VR602 : CAM_PCLK
Check theControl signal
CAM_DATA[0:7], CAM_RESET/,CAM_SDA, CAM_SCL
Camera willwork properly
Replace X400No
No
No
Yes
Yes
Yes
Replace the Camera module
Check CON601 soldering Re-solder CON601
Yes
Checking Flow
; Check VR600, VR601, VR602, VR603
Check the voltage of the following LDOs :+2.8V_CAM_AVDD+2.8V_CAM_VDD +1.8V_CAM_VDD
No
Replace U503/U505
Yes
4.3.4 Audio
Circuit Diagram
4.3.4.1 Speaker Trouble
Test Points
U301
C302C301
L304L303L301L302
SETTING : “Melody on” at sounds of test menu.
Voltage at L300Is about 3.4~4.2V
START
Check the audio signal atC301, C302
Check the audio signal atL301~L304
Check the Soldering ofU301
Check the stateOf contact of speaker
Speaker will work properly
NO
NO
NO NO
Yes
Yes
Yes
Yes
Yes
Replace L300
Replace U301
Re-solder U301
Check the Soldering ofC301, C302
NO
Yes
Replace MSM
Re-solder C301, C302
Checking Flow
NOReplace Speaker
4.3.4.2 Receiver Trouble
Circuit Diagram
Test Points
U301
C302C301
L304L303L301L302
L306
L305
Voltage at L300Is about 3.4~4.2V
START
Check the audio signal atC301, C302
Check the audio signal atL305, L306
Check the Soldering ofU301
Check the stateOf contact of receiver
Receiver will work properly
NO
NO
NO NO
Yes
Yes
Yes
Yes
Yes
Replace L300
Replace U301
Re-solder U301
Check the Soldering ofC301, C302
NO
Yes
Replace MSM
Re-solder C301, C302
Checking Flow
NOReplace Receiver
4.3.4.4 Headset Trouble
Circuit Diagram
Test Points
U301
C302C301
L304L303L301L302
L306
L305
C311
C309
Checking Flow
START
Does the audio Profile of the phone change to
the headset mode?
Can you hear your voicefrom the headset?
The headset willwork properly
Insert the headset to the handset.
Change the headset andtry again.
No
No
Yes
Yes
Set the audio part of the testequipment to echo mode
Headset detect problem
Can you hear your voicefrom the headset?
Set the audio part of the test equipment to
continuous wave mode Headset receivingPath problem
Can you hear the soundfrom the headset?
Headset sending path problem
1
4
2
3
No
Yes
No
Headset receiving path problem
2
Level of C309, C311is about 1.2V ?
Check soldering ofPin2,3 of CON302
Changemain board
DownloadS/W
Re-soldering ofPin2,3 of CON302
Yes
Yes
No
No
Yes
Yes
Headset detect problem
Level of pin4 of CON302Is 1.65~2.10V?
Re-solder R315
No
Yes
1
Check soldering R315
Check solderingQ300
Level of EAR_JACK_SENSE/
Is low?
Re-solder Q300
Download SW
4
No
Headset sending path problem
Headset detectproblem
Headset sending
path problem 3
Level of pin4 of CON302Is 1.65~2.10V?
Does it work?
Re-solder R315
Download SW
Does it work well?
4
Change mainboard
No
No
Yes
Yes
Yes
No
No
No
Yes
Yes
Yes
4.3.4.3 Mic Trouble
Circuit Diagram
Test Points
M200
R238
SETTING : After initialize 5515C, Test Cellular
START
Check the voltage level at R238 is 1.0~2.0V
Check the soldering Of R238
Re-solder R238
Replace MSM
Check the signal levelat each side of MIC.
Replace the microphone
Check the soldering at C2001, C2002
Check the soldering ofMIC NETWORK
Re-solder MIC NETWORK
MIC will work properly
Checking Flow
Yes
Yes
Yes
Yes
No No
No
No
No
Yes
Re-soldering C2001, C2002
4.3.6 Vibrator, Mini SD Detect, and USB Interface
Circuit Diagram
4.3.6.1 Vibrator
Test Points
R417
Q401
Q402
D400
R416
R418
Checking Flow
SETTING : “Vibrator on” at Sounds of test menu
START
Is the voltage of MOTOR_ENabout 2.6V ?
Change the main board
Check soldering of R416, R417, R418
Re-solder R416, R417, R418
Check the state atContact of Vibrator
Re-contact vibrator
Replace Vibrator
The vibrator willWork properly
No
No
No
Yes
Yes
Yes
Yes
Is Q401, Q402Working?
Replace Q401, Q402No
Yes
Circuit Diagram
4.3.6.2 Micro SD Detect
Test Points
CON300
PIN 1
R503U502
PIN 2PIN 3PIN 4PIN 5
PIN 7PIN 8
PIN 9
Checking Flow
START
Level of SD_DETECT at PIN 9of CON300 is ‘High’ ?
Level of +3.0V_SD at U502is 3.0V ?
Levels of SD_CMD(PIN3 of CON300)and SD_DATA[0]~DATA[3](CON300)
are ‘High’ ?
THE MINI SD CARD WILL BE DETECTED
Check the soldering of R327 & CON300
Replace U502
No
No
No
Yes
Yes
Yes
Frequency of SD_CLK(PIN5of CON300) is about
9.6MHz ?
Yes
No
SETTING : Insert the mini SD card into the phone
Replace the MSM
Access a file in the micro SD ; play music or view a PIX/FLIX
Replace the main board
Circuit Diagram
4.3.6.3 USB Interface
C538
R200
R538 U502
Test PointsX200
Checking Flow
START
YES
Level of VBUS at R538is 5.0V ?
NOCheck the connecting of the data cable
Check the voltage of the followingport at U502VIO=2.6V?VPU=3.3V?
YES
NO
YES
Check the soldering U502Re-soldering
U502
Replace U502
Replace the MSMLevel of USB_SUPEND at C538 is ‘Low’ ?
Check the voltage level at R537Is it almost 3.3V?
YES
YES
NO
NOCheck the soldering
R537,R544,R545
Re-solderingR537,R544,R545
Replace U502
THE USB INTERFACE WILL WORK PROPERLY
The Frequency at X200 is 48 MHz?
YES
NO
Check the soldering X200,R200Re-soldering X200,R200
Replace X200,R200
NO
NO
YES
YES
NO
YES