lg cm4530.pdf
TRANSCRIPT
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Mini Hi-Fi SystemSERVICE MANUAL
MODEL: CM4530 (CM4530, CMS4530F, CMS4530W)CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS
IN THIS MANUAL.
MODEL:CM4530(CM4530,CMS4530F,CMS4530W)
SERVICEMANUAL
3102,FEBRUARY76033048NFA:ON/P
Website http://biz.lgservice.com
Internal Use Only
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CONTENTS
SECTION 1 ........GENERAL
SECTION 2 ........CABINET & MAIN CHASSIS
SECTION 3 ........ELECTRICAL
SECTION 4 ........REPLACEMENT PARTS LIST
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SECTION 1
SUMMARY
CONTENTS
SERVICING PRECAUTIONS ................................................................................................................... 1-3
ESD PRECAUTIONS .................................................................................................................................. 1-5
HIDDEN KEY MODE................................................................................................................................... 1-6
SERVICE INFORMATION FOR EEPROM .......................................................................................... 1-7
PROGRAM DOWNLOAD & UPDATE GUIDE ................................................................................... 1-81. AUDIO PROGRAM ................................................................................................................................... 1-8
2. CD PROGRAM ......................................................................................................................................... 1-9
3. EQ PROGRAM ....................................................................................................................................... 1-10
SPECIFICATIONS ..................................................................................................................................... 1-11
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NOTES REGARDING HANDLING OF THE PICK-UP1. Notes for transport and storage
1) The pick-up should always be left in its conductive bag until immediately prior to use.
2) The pick-up should never be subjected to external pressure or impact.
2. Repair notes1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.
2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure andimpact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or
damage to the printed-circuit board.3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason
the adjustment point and installation screws should absolutely never be touched.
4) Laser beams may damage the eyes!Absolutely never permit laser beams to enter the eyes!
Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.
Storage in conductive bag Drop impact
NEVER look directly at the laser beam, and dont allow
contact with fingers or other exposed skin.
SERVICING PRECAUTIONS
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NOTES REGARDING COMPACT DISC PLAYER REPAIRS1. Preparations1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components
are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, componentscan be damaged, and for that reason components should be handled with care.
2) The pick-up is composed of many optical components and other high-precision components. Care must be
taken, therefore, to avoid repair or storage where the temperature or humidity is high, where strong magnet-ism is present, or where there is excessive dust.
2. Notes for repair
1) Before replacing a component part, first disconnect the power supply lead wire from the unit2) All equipment, measuring instruments and tools must be grounded.
3) The workbench should be covered with a conductive sheet and grounded.When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is
because there is the possibility of damage by static electricity.)4) To prevent AC leakage, the metal part of the soldering iron should be grounded.5) Workers should be grounded by an armband (1 M)
6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent stat-ic electricity changes in the clothing to escape from the armband.
7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.
Resistor(1 M)
Armband
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Electrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electricity. Such componentscommonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques shouldbe used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear acommercially available discharging wrist strap device, which should be removed for potential shock reasons
prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surfacesuch as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static" can
generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESDdevices.
6. Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together byconductive foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touch theprotective material to the chassis or circuit assembly into which the device will by installed.
CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHERSAFETY PRECAUTIONS.
ESD PRECAUTIONS
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Push both Front key and RCU key to activate it for 5 seconds.
1. Disc Lock On/Off (CD Function Only Active)Front Key : STOPRCU Key : STOP
2. Check Version and Option codeFront Key : STOPRCU Key : PLAY/PAUSEYou can change [Audio MCU Version CD Controller Version EEPROM Option] by SKIP+/-.
3. Clear EEPROMFront Key : STOPRCU Key : SKIP-
4. Edit EEPROMFront Key : STOPRCU Key : SKIP+
You can change the digit of option by SKIP+/-.You can edit 0~f by REPEAT or PLAY/PAUSE key.
5. Bluetooth DUTFront Key : STOPRCU Key : PROGRAMBluetooth model only
HIDDEN KEY MODE
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POWER ON
FLD no disc status or AUX status.
Remote control Fwd skip + Front STOP
push same timing during 5 seconds.
FLD OP-0.
Move to appropriate position andmake changes with remote control
skip, mode, play key.
Press ENTER key
NAME
OPT0
OPT1
OPT2
OPT3
OPT4OPT5
OPT6
OPT7
OPT8
OPT9
DETECT NEW EEPROM
(OPTION EDIT SCREEN)
HEX
05
00
00
02
00
69
81
05
20
00
SERVICE INFORMATION FOR EEPROM
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1. AUDIO PROGRAM
Download program file name must be CM4530_***.HEX
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage
device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other
function, nor power off the device. USB device must be unplugged when the downloading
process is completed.
ON VFD DISPLAY SCREEN
NO USB
Insert USB device at USB function.
SEARCH
FIRMWARE
WRITE 00 .. 100
PROGRAM DOWNLOAD & UPDATE GUIDE
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2. CD PROGRAM
Download program file name must be HF000_CM4530_xxxxxxxx_xx.bin
Tip) With B/T : HF000_CM4530_xxxxxxxx_xx.bin
Without B/T : HF400_CM4530_xxxxxxxx_xx.bin
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage
device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the otherfunction, nor power off the device. USB device must be unplugged when the downloading
process is completed.
ON VFD DISPLAY SCREEN
NO USB
Insert USB device at USB function.
SEARCH
FIRMWARE
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3. EQ PROGRAM
Download program file name must be EQ_PRG_CM4530_***.BIN
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage
device and disable the security software, then download the file to your set.
Caution: When downloading the file, you should neither unplug the USB device, change to the other
function, nor power off the device. USB device must be unplugged when the downloading
process is completed.
ON VFD DISPLAY SCREEN
NO USB
Insert USB device at USB function.
READ
EQ DOWN
FINISH
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SPECIFICATIONS
GENERAL
Power requirements Refer to the main label.Power consumption Refer to the main label.Dimensions (W x H x D) 202 x 307 x 315 mmNet Weight (Approx.) 3.15 kg
Operating temperature 5 C to 35 C (41 F to 95 F)Operating humidity 5 % to 90 %
Bus Power Supply DC 5 V 500 mA
INPUTSAUX IN 2.0 Vrms (1 kHz, 0 dB), 75 , RCA jack (L, R) x 1
TUNERFM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz
AM Tuning Range 522 to 1 620 kHz, 520 to 1 710 kHz or 522 to 1 710 kHz
AMPLIFIERStereo mode 160 W + 160 W (4 at 1 kHz, THD 10 %)
Surround mode Front 160 W + 160 W (4 at 1 kHz, THD 10 %)Subwoofer 180 W (3 at 1kHz, THD 10 %)
CD
Frequency Response 100 to 20 000 Hz
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MEMO
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SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS..................................................................................................................................... 2-31. CABINET AND MAIN FRAME SECTION (CM4530) ................................................................................ 2-3
2. MECHANISM DECK SECTION (DP-12AM) ............................................................................................. 2-5
3. PACKING ACCESSORY SECTION ......................................................................................................... 2-7
4. SPEAKER SECTION ................................................................................................................................ 2-8
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MEMO
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EXPLODED VIEWS1. CABINET AND MAIN FRAME SECTION (CM4530)
E
D D
A
G
B
E
H
A
B
G
F
FRONT
MAIN
F
260L
260R
464
464
464
464
464
464
A47
276
262
279
464
464
464
A44
A46
274
273
460
265
261
A43
464
464
259251
A42CABLE2
464
464
451
SMPS
300
H
NOTES) THE EXCLAMATION POINT WITHIN AEQUILATERAL TRIANGLE IS INTEND
TO ALERT THE SERVICE PERSONNE
TO THE PRESENCE OF IMPORTANT
SAFETY INFORMATION IN SERVICE
LITERATURE.
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2. MECHANISM DECK SECTION (DP-12AM)
A02
439
018
013
017
014
020
016
440
015
015B
015A
435
A01
026
001
002
012
012
037
012A
019442
442
A03
003
010
MEMO
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824 AM Loop Antenna
900 Remote Control
808 Battery
825 FM Wire Antenna
801 Instruction Ass'y
3. PACKING ACCESSORY SECTION
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A60
4. SPEAKER SECTION4-1. FRONT SPEAKER (CMS4530F)
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A90
4-2. SUBWOOFER SPEAKER (CMS4530W)
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MEMO
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SECTION 3
ELECTRICAL
CONTENTS
ONE POINT REPAIR GUIDE ................................................................................................................... 3-2
1. NO POWER ............................................................................................................................................ 3-22. NO BOOTING WHEN POWER ON THE SET ....................................................................................... 3-43. VFD IS NOT DISPLAYED WHEN POWER ON THE SET..................................................................... 3-54. NO OPERATION OF MD ....................................................................................................................... 3-65. NO SOUND .......................................................................................................................................... 3-11
AUDIO ELECTRICAL TROUBLESHOOTING GUIDE .................................................................. 3-161. POWER (SMPS) ................................................................................................................................... 3-162. -COM PART CHECK .......................................................................................................................... 3-203. IC102(N24C16) CHECK ....................................................................................................................... 3-204. FLD DISPLAY CHECK ......................................................................................................................... 3-21
5. PWM MODULATION CHECK .............................................................................................................. 3-226. POWER AMP PART CHECK ............................................................................................................... 3-247. TUNER / AUX FUNCTION CHECK ...................................................................................................... 3-258. TUNER FUNCTION CHECK ................................................................................................................ 3-26
CDP ELECTRICAL TROUBLESHOOTING GUIDE ....................................................................... 3-271. CD FUNCTION ..................................................................................................................................... 3-272. DOUBLE USB FUNCTION ................................................................................................................... 3-28
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ONE POINT REPAIR GUIDE
1. NO POWER
If the unit doesnt work by no power problem, repair the set according to the followingguide.
1-1. FUSE & BRIDGE DIODE1-1-1. SolutionPlease check and replace F901, BD901, TH901 on SMPS board.
1-1-2. How to troubleshoot (Countermeasure)
1) Check if the fuse F901 is open or short-circuit.2) Check if the bridge diode BD901 is short-circuit by over current with a digital multi meter.3) Check if the NTC thermistor TH901 is normal or open.
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ONE POINT REPAIR GUIDE
NO POWER
If the unit doesnt work by no power problem, repair the set according to the followingguide.
1-2. D9291-2-1. SolutionPlease check and replace D929 on SMPS board.
1-2-2. How to troubleshoot (Countermeasure)
1) Check the Anode-Cathod Voltage of D929 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.If it doesnt have any voltage, its destroyed. Replace it with a new one.
1-2-3. Service hint (Any picture / Remark)
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ONE POINT REPAIR GUIDE
2. NO BOOTING WHEN POWER ON THE SET
The set doesnt work when press the power button on the front board or the remotecontrol.
2-1. FLASH MEMORY2-1-1. SolutionPlease check and replace IC102 on MAIN board.
2-1-2. How to troubleshoot (Countermeasure)
1) Check 3.7 V to CN101 and CN105 in standby mode.If there is no 3.7 V, check the SMPS.2) Check 5.6 V, 12 V, F+, F- and PVDD when power on the set.
- If the set doesnt work regardless of what the KEY1 changes high to low while pressing the power button.X100 and X101 work normally but, if you can not power on the set, replace IC101 with a new one on
the MAIN board.
2-1-3. Service hint (Any picture / Remark)
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ONE POINT REPAIR GUIDE
3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET
When power on the set, any icons or characters on VFD are not displayed.
3-1. VFD3-1-1. SolutionPlease check and replace DIG502 on FRONT board.
3-1-2. How to troubleshoot (Countermeasure)1) Check if VKK, FL+ and FL- are output from SMPS to VFD via the MAIN board.2) Check if IC102 outputs VFD_D0, VFD_CLK and VFD_STB to the FRONT board.3) Check the GR signal(pulse signal) of IC501 on the FRONT board.
Check the SG signal(pulse signal) of IC501 on the FRONT board.If the GR and SG signal isnt output, replace IC501 with a new one.
If the GR and SG signal is output, replace DIG502 with a new one.
3-1-3. Service hint (Any picture / Remark)
GR SIGNAL
ABOUT 30V
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ONE POINT REPAIR GUIDE
4. NO OPERATION OF MD
When no sound output in the CD function, you can not listen to music reading datafrom a CD disc if the servo motors in MD dont work. This step is for checking theSPINDLE MOTOR among them.
4-1. SPINDLE MOTOR4-1-1. SolutionPlease check and replace IC301, IC302 on MAIN board.
4-1-2. How to troubleshoot (Countermeasure)1) Check the SPDO signal from pin16 of IC302.If no signal, check 3.3 V(RF) and X301.
2) Check the SPIN- & SPIN+ from IC301 to CN303 for driving SPINDLE motor. It is about 3.6 Vp-p.If no signal, check +1.8 V and +5 V for IC301.3) Check if the FFC cable is solidly connected between CN303 and MD.
4) Check the MD.If the spindle motor is sort-circuit or has any trouble, it can not rotate CD discs.
Please check the function after changing another MD.
4-1-3. Service hint (Any picture / Remark)
Sp-
Pin18 to CN303
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ONE POINT REPAIR GUIDE
NO OPERATION OF MD
When no sound output in the CD function, you can not listen to music reading datafrom a CD disc if the servo motors in MD dont work. This step is for checking theSLED MOTOR among them.
4-2. SLED MOTOR4-2-1. SolutionPlease check and replace IC301, IC302 on MAIN board.
4-2-2. How to troubleshoot (Countermeasure)1) Check the SLDO signal from Pin15 of IC302.If no signal, check 3.3 V(RF) and X301.
2) Check the SLED+ & SLED- from IC301 to CN303 for driving SPINDLE motor. It is about 2.9 Vp-p.If no signal, check +1.8 V and +5 V for IC301.3) Check if the FFC cable is solidly connected between CN303 and MD.
4) Check the MD.If the sled motor is sort-circuit or has any trouble, it can not move the pickup module.
Please check the function after changing another MD.
4-2-3. Service hint (Any picture / Remark)
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ONE POINT REPAIR GUIDE
NO OPERATION OF MD
When no sound output in the CD function, you can not listen to music reading datafrom a CD disc if the servo motors in MD dont work. This step is for checking theTRAY OPEN / CLOSE MOTOR among them.
4-3. TRAY OPEN / CLOSE MOTOR4-3-1. SolutionPlease check and replace IC301, IC302 on MAIN board.
4-3-2. How to troubleshoot (Countermeasure)1) Check MOT_OPEN & MOT_CLOSE signals from Pin104, 105 of IC801 to IC301.If no signal, check +1.8 V & + 5 V to IC301.
2) Check LOAD from IC301 to CN303 for driving the tray open / close motor. It is about 3.85 Vp-p.If no signal, check +5 V to IC301. If it has any trouble, replace it with a new one.3) Check if the FFC cable is solidly connected between CN303 and MD.
4) Check the MD.If the tray motor is sort-circuit or has any trouble, it can not open or close the tray.
Please check the function after changing another MD.
4-3-3. Service hint (Any picture / Remark)
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ONE POINT REPAIR GUIDE
NO OPERATION OF MD
When no sound output in the CD function, you can not listen to music reading datafrom a CD disc if the pickup module in MD doesnt work. This step is for checking theLASER TRACKING ACTUATOR.
4-4. LASER TRACKING ACTUATOR4-4-1. SolutionPlease check and replace IC301, IC302 on MAIN board.
4-4-2. How to troubleshoot (Countermeasure)The tracking actuator makes the laser beam be positioned in the center of a track on CD disc.1) Check the TRD signal from Pin14 of IC302.
If no signal, check 3.3 V(RF) and X301.2) Check TR- & TR+ from IC301 to CN301 for driving the tracking actuator.If no signal, check +1.8 V and +5 V for IC301.
3) Check if the FFC cable is solidly connected between CN301 and MD.4) Check the MD.
If the pickup module has any trouble, it can not move the laser beam on the left or right side.
Please check the function after changing another MD.
4-4-3. Service hint (Any picture / Remark)
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ONE POINT REPAIR GUIDE
NO OPERATION OF MD
When no sound output in the CD function, you can not listen to music reading datafrom a CD disc if the pickup module in MD doesnt work. This step is for checking theLASER FOCUSING ACTUATOR.
4-5. LASER FOCUSING ACTUATOR4-5-1. SolutionPlease check and replace IC301, IC302 on MAIN board.
4-5-2. How to troubleshoot (Countermeasure)The focusing actuator makes the laser beam keep a regular interval with the surface of a CD disc.1) Check the FOD signal from Pin13 of IC302.
If no signal, check 3.3 V(RF) and X301.2) Check F- & F+ from IC301 to CN301 for driving the focusing actuator.If no signal, check +1.8 V and +5 V for IC301.
3) Check if the FFC cable is solidly connected between CN301 and MD.4) Check the MD.
If the pickup module has any trouble, it can not move the laser beam on the top or bottom side.
Please check the function after changing another MD.
4-5-3. Service hint (Any picture / Remark)
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ONE POINT REPAIR GUIDE
5. NO SOUND
There is no sound output in the CD FUNCTION, repair the set according to the follow-ing guide.
5-1. IN THE CD FUNCTION5-1-1. SolutionPlease check and replace IC601, IC801 on MAIN board.
5-1-2. How to troubleshoot (Countermeasure)
1) Check CD_BCLK, CD_LRCK, & CD_DOUTA signals from IC302 to IC801.If no signal, check if the RF & servo signals from MD is entered to IC302. Refer to the No operation of MD guide on Item 4.
2) Check the following I2S signal flow. < I2S audio signal Interface > - DAC_BCK : IC801_Pin85 --> IC601_Pin23
- DAC_LRCK : IC801_Pin86 --> IC601_Pin22 (44.1 kHz) - DAC_DATA : IC801_Pin81 --> IC601_Pin24
- DAC_MCLK : IC801_Pin84 --> IC401_Pin44If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.3) Check if Digital audio AMP block on Item 5-2 is normal.
5-1-3. Service hint (Any picture / Remark)
P/UP BX8805
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ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output by DIGITAL AUDIO AMP DAMAGE, repair the set accordingto the following guide.
5-2. BY DIGITAL AUDIO AMP DAMAGE (IN ALL FUNCTIONS)5-2-1. SolutionPlease check and replace IC701, IC702 on MAIN board.
5-2-2. How to troubleshoot (Countermeasure)
1) Check FL, FR & SW signals from IC601 to IC701 & 702 each input function.If no signal, check if I2S audio signals are entered to IC601. Refer to I2S audio signal interface on Item 5-1.
2) Check PVDD.If PVDD is abnormal, check the SMPS.
3) Check +12 V for driving the gate of AMP IC. a. All the powers are normal, but if +12 V is low, there is possible for AMP IC to be damaged.
b. Remove L707, L708, L709 and L712 one by one. When removed a inductance, if +12 V is recovered, the IC connected to it was damaged.
c. Replace the IC with a new one.4) Check the impedance between IC701/IC702_OUT-A/OUT-B & GND. a. If the impedance is 0 , the IC must be damaged.
b. After removing the heat sink, replace it with a new one.
5-2-3. Service hint (Any picture / Remark)
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ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the USB FUNCTION, repair the set according to the fol-lowing guide.
5-3. IN THE USB FUNCTION5-3-1. SolutionPlease check and replace IC801 on MAIN board & IC502 on USB board.
5-3-2. How to troubleshoot (Countermeasure)1) Check +5VU to USB board.If the USB LED are turned on, the voltage is okay, if so not, check +5.6 V to pin6 of CN502.2) Check USB D from MAIN board to USB board.
a. Check USB_DM/DP signals to IC801(pin117, 118). b. Check USB signals to CN502 (pin1, 2, 4, 5).
If there is any trouble, check the power for each IC. The power is normal but , if the signal waveform tothe IC is distorted or no signal, replace it with a new one.
3) Check if Digital audio AMP block on item 5-2 is normal.
5-3-3. Service hint (Any picture / Remark)
USB HUBUSB2512 USB1
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ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the AUX FUNCTION, repair the set according to the fol-lowing guide.
5-4. IN THE AUX FUNCTION5-4-1. SolutionPlease check and replace IC401 on MAIN board.
5-4-2. How to troubleshoot (Countermeasure)1) Check AUX_L/R signals to IC401 (Pin7, 8).2) Check if DAC_BCK, DAC_LRCK, & DAC_MCLK are entered from IC801 to IC401.3) Check if ADC_DATA is entered from IC401 to IC801.
If no signal, check +5 V & +3.3 V(ADC) for IC401. If is NG, replace it a new one.4) Check the following I2S signal flow from IC801 to IC602. (Refer to Item 5-1.)
If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.
5) Check if the digital audio AMP block is okay. Refer to Digital Audio AMP guide on Item 5-2.If AMP is damaged, replace it with a new one.
5-4-3. Service hint (Any picture / Remark)
AUX
AUX_L/R
74HCT244
IC401CS5346
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ONE POINT REPAIR GUIDE
NO SOUND
There is no sound output in the TUNER FUNCTION, repair the set according to thefollowing guide.
5-5. IN THE TUNER FUNCTION5-5-1. SolutionPlease check and replace IC401, TU100 on MAIN board.
5-5-2. How to troubleshoot (Countermeasure)1) Check if TUNER_LR is entered from Pin1,3 of TU100 to IC401(Pin23, 24).If no signals, Check +3.3 V for Tuner power.Check if the Tuner control signals (CLK, DAT, CE, RST, SLT) are entered from IC102 to TU100.
If it doesnt work, replace TUNER with a new one.2) Check if DAC_BCK, DAC_LRCK, & DAC_MCLK are entered from IC501 to IC401.
3) Check if ADC_DATA is entered from IC401 to IC801.If no signal, check +5 V & +3.3 V(ADC) for IC401. If is NG, replace it with a new one.
4) Check the following I2S audio signal flow from IC801 to IC601. (Refer to Item 5-1.)If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to
the IC is distorted or no signal, replace it with a new one.5) Check if the digital audio AMP block is okay. Refer to Digital Audio AMP guide on Item 5-2.If AMP is damaged, replace it with a new one.
5-5-3. Service hint (Any picture / Remark)
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1. POWER (SMPS)
No 3.7 VA
YES
F901 normal? Replace F901 (Use the same fuse).
YES
NO
BD901 normal? Replace BD901.
YES
NO
TH901 normal? Replace TH901.
YES
NO
Is Vcc(10 V ~ 18 V) supplied to
IC901 Pin7?D904 normal?
YES
NO
Check or replace D904.
NO
NO
AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE
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No PVDD
YES
F901 normal? Replace F901 (Use the same fuse).
YES
NO
BD901 normal? Replace BD901.
YES
NO
TH901(TH902) normal? Replace TH901.
YES
NO
Is Vcc(10 V ~ 18 V) supplied to
IC902 Pin7?D905 normal?
YES
NO
Check or replace D905.
Q910 b "H"?
NO
NO
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No 12 V
Is Vcc(15 V) supplied to Q953
collector?Check or replace D921.
YES
YES
NO
Is the13 V Supplied to Q953
base?
Check P-CTRL H signal
from -COM.
YES
NO
Check or replace Q953.
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No VFD
D925 normal? Check or replace D925.
YES
YES
NO
ZD951 normal?
Q951 normal?
Check or replace ZD951.
Check or replace Q951.
YES
YES
NO
NO
Check or replace VFD.
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2. -COM PART CHECK
-COM PARTCHECK
Refer toSMPS troubleshooting.
NOCheck ifvoltage of CN105 Pin10
is 3.7 VA.
Check if output of D103 is 3.7 V.
NOCheck
both end voltage ofD102, D103.
Check if IC101_Pin49 andIC101_Pin36,59 are 3.7 V.
YES
Check D102, D103. Replace D102, D103.NONO
X101: 32.768 kHzX102: 9 8304 MHz
YES
YES
YES
YES
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4. FLD DISPLAY CHECK
FLD DISPLAY CHECK
YES
CheckCN105 Pin1,2,3 input
voltage.
YES
Check if both end voltageof FL+, FL- are over 2.9 V
VKK : over 25.6 V.
NORefer to SMPS troubleshooting.
YES
Check CN501connection and power
Pin1, 2, 3(FL+, FL-, VKK),
Pin10(3.7 VA).
YES
OK
NOCheck CN501 connection.
YES
Check eachPin voltage.
YES
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5. PWM MODULATION CHECK
PWM MODULATION PART CHECK
CheckCN105 Pin11 3.7 VA.
Check IC601(TAS5548)
VDD 3.3 V
Check VDD Core 1.2 V.
NO Refer toSMPS troubleshooting.
Check
X602(19.2 MHz)
operation.
NOReplace X602(19.2 MHz).
Check X602
(19.2 MHz).
YES
NO
YES
YES
YES
YES
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Check
IC601(PS9854)input data
Pin4, 5, 6PWM wave.
NO Refer toCD troubleshooting.
Check
CD Assy communication
Pin4, 5, 6.
OK
NO
NO Check each lineresistor output.
Check
IC601(PS9854) input
data.
CheckPWM
YES
YES
YES
YES
A
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6. POWER AMP PART CHECK
POWER AMP PART CHECK
Refer to SMPS troubleshooting.NOCheck
CN105 Pin6: +12 VPin14,15: 26 V.
YES
YES
Check IC701, IC702
Pin29, 30, 31, 36, 37, 38 input voltage.
YES
Check each line resistor output voltage.NOCheck IC701, IC702
Pin2: +12 V input.
Check PWM Modulator inputIC701 Pin5, 6, 14, 15 / IC702 Pin5, 6.
YES
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7. TUNER / AUX FUNCTION CHECK
FUNCTION CHECK
Check JK401,TU100.NO
YES
Check IC401(CS5346) Pin7, 8,
23, 24 input.
YES
YES
Check IC401
(CS5346) Pin9 outputdata.
YES
Check IC401Pin5: +5 V
Pin46: +3.3 V.
Check CN105 Pin7: +5 VPin9, 10: +3.3 V.
NONO
CheckIC801(BX8805)
input data.
Check IC401
Pin5: +5 V,Pin6: High,
Pin46: 3.3 V.
Check IC401Pin41: SDOUT,Pin42: SLCK,Pin43: LRCK,Pin44: MCLK
NONO
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8. TUNER FUNCTION CHECK
TUNER FUNCTION CHECK
Check tuner module voltage(Pin4: +3.3 V).
NOCheck tunermodule(TU100)
operation.
YES
YES
Check IC102 Pin21, 22, 23, 24, 25
data in/output. Check tuner module data.NO
YES
Refer to function check.
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CD FUNCTION
YES
Can thedisc insert?
NO Is Motor_open/close
OK? (IC301 Pin10,11)
NO
YES
Disc readingis ok?
Is no signal at spk?
YES
Is Motor ok?(about 12 )
Is load +,- ok?
YES
Check loading motor.
NO
IM driving (Focus andtracking) is ok?
NO
Focus/
tracking/sled signal
is ok?NO Check IC301
(Motor drive IC).
NO
Is the PD(CN301
Pin22) about 190 mV?
YES
Check IC301.
YES
1. CD FUNCTION
Check IM
(pick-up).
NO
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USB FUNCTION
Check USB_5V.Display NO USB.
YES
YES
Check USB_D+/D-(R501,R502).
YES
Plug-in usb device.
Check CN502.NONO
YES
Display READ.
YES
Display NO FILE
YES
Check usb jack (JK501/ JK502).
NO
Replace IC801NO
Check IC801(Pin116 117)
2. DOUBLE USB FUNCTION
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1. SDRAM
1
2
3
4
CLK
DATA
ADDRESS
CS
WAVEFORMS OF MAJOR CHECK POINT
IC802 Pin38
IC802 Pin53
IC802 Pin35
IC803 Pin1
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FE
TE
FOD
RF
6
7
8
9
IC302 Pin61
IC302 Pin62
IC302 Pin63
IC302 Pin13
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13
14
16
15
DAC_MCLK
DAC_BCK
DAC_LRCK
DAC_DATA
IC801 Pin84
IC801 Pin85
IC801 Pin86
IC801 Pin81
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MEMO
WIRING DIAGRAM
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3-33 3-34
23P9P
SPK TERMINAL TUNER
MODULE
1 CD MD
MAIN PCB
16P
FRONT PCB
SMPS PCB
15P
AUX
JACK
Po
wer
cord
8P
: Harness
: FFC
BT8P
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2. SMPS BLOCK DIAGRAM
SMPS
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3-37 3-38
PVDD
Noise
FilterBlock
(X-capLine Filter)
SnubberBlock
Main
SMPS ICBlock
TR
A
N
S
Snubber
Block
Photo coupler
Photo coupler
Photo coupler
FL+
FL-
Vkk
On/Off
5V5V LDO
12V12V
RegulationBlock
3.7VA
P.CTL
On/Off
On/Off
AMP
SMPS ICWith FET
Block
F
U
S
E
Y-Cap
Y-Cap
T
RA
N
S
SMPS
5.6VACN901
Feedback
Feedback
3. AUDIO PATH BLOCK DIAGRAM
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3-39 3-40
12MHZ
AMP Block
MAIN
Block
PWMTAS5548
TAS5612LAFR,FL
Woofer
Tuner
Aux in
ADCCS5346
(SLAVE)
A_AUX
BX8805
(128 PIN)
DAC_
DATA
DAC_LRCK
DAC_BCKA_TUNER DAC_MCLK
12.288MHZ
DAC_LRCK
DAC_BCK
74AHC244
TAS5612LA
150Wx2
200Wx1
BU9543KV
CD_BCK
CD_LRCK
CD_DATA
ADC_DATA
BCK
LRCK
DATA
244_CTRL1/CTRL2
(From MICOM)
4. MAIN POWER DIAGRAM
RESET
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3-41 3-42
MICOMVDD
P_CTRL
PWR_SENSE
RESET
EEPROM3.3V
BU9543KV
S3053
SDRAM
FLASH
CS53465VA
VCC15VCC33
VCC33
VCC33
VCC33
VCC33
+3.7VA
TUNER
VCC33PICKUP
BX8805
VCC33
VCC12LM1117-1.2V
TJ3965D
KIA7027AF
TAS5548VCC33
VCC18
5V
VCC33
5V
VCC3374HCT244 ADD
BT moduleVCC33
5. FRONT/ AMP POWER DIAGRAM
FROM_MAIN to Front
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3-43 3-44
RCU
VFD
TAS5612LA
USB1USB_5VLM37102-ADJ5.6VA
_
+3.7VA
VKK/FL-+
12V
FROM_SMPS to AMP
PVDD
MC3401
FAN
12V LED
USB_5V USB2
CIRCUIT DIAGRAMS1. SMPS CIRCUIT DIAGRAM
IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS, UNDER NOCIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BEMODIFIED OR ALTERED WITHOUT PERMISSIONFROM THE LG CORPORATION. ALL COMPONENTSSHOULD BE REPLACED ONLY WITH TYPES IDENTICALTO THOSE IN THE ORIGINAL CIRCUIT. SPECIAL
COMPONENTS ARE SHADED ON THE SCHEMATICFOR EASY IDENTIFICATION.THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFERFROM THE ACTUAL CIRCUIT USED. THIS WAY,IMPLEMENTATION OF THE LATEST SAFETY ANDPERFORMANCE IMPROVEMENT CHANGES INTOTHE SET IS NOT DELAYED UNTIL THE NEW SERVICELITERATURE IS PRINTED.
NOTE :
1. Shaded( ) parts are critical for safety.Replace only with specified part number.
2. Voltages are DC-measured with a digital voltmeterduring Play mode.
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3-45 3-46
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R S T
CAUTION:Danger if fuse is i ncorrectly replaced.
Replace only with the type identical to fuse ratingand(or) model name described in main label.
WarningParts that are shaded are critical withrespect to risk of fire or electrical shock.
SMPEAX64991501_0.1.0_SMPS_
2013. 01.
2. MAIN - DSP CIRCUIT DIAGRAM
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3-47 3-48
1
3
11 12
10
5
15
13
16
14
24
17
18
: WAVEFORM NUMBER
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R S T
DSPEAX64991601_0.1.0_MAIN_SD_1
2013.01.08
3. MAIN - MICOM/ ADC CIRCUIT DIAGRAM
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3-49 3-50
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R S T
MICOM & AEAX64991601_0.1.0_MAIN_S
2013.01
4. MAIN - AMP CIRCUIT DIAGRAM
12
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3-51 3-52
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R S T
AMPEAX64991601_0.1.0_MAIN_SD_3
2013.01.08
5. MAIN - RF SERVO CIRCUIT DIAGRAM
12
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3-53 3-54
8
9 7 6
: WAVEFORM NUMBER
A
1
2
3
4
5
6
7
8
9
10
11
12
B C D E F G H I J K L M N O P Q R S T
RF SERVEAX64991601_0.1.0_MAIN_SD
2013.01
6. FRONT CIRCUIT DIAGRAM
12
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3-55 3-56
A
1
2
3
4
5
6
7
8
9
10
11
B C D E F G H I J K L M N O P Q R S T
FRONTEAX64991401_0.1.0_FRONT_SD
2013.01.08
CIRCUIT VOLTAGE CHART
SMPS Input LDO TYPE Used-current(mA) Total-current Real Input(V) LDO Used-power(W) Total-power(W) Item
3.7VA / / 10.5 10.5 3.7 / / STBY-LED
VA Di d MBR MC
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3-57 3-58
3.7VA
3.7VA Diode MBR0540 49
3.3 0.0020
MC3401
3.7VA Diode MBR0540 5 3.3 0.002 MICOM & EEPROM
3.7VA
LDO TJ3965D-ADJ
16
178.5
3.3 0.006
0.071
SDRAM
3.7VA 8.2 3.3 0.003 Flash
3.7VA 13 3.3 0.005 BU9543KV
3.7VA 22 3.3 0.009 TUNER
3.7VA 92 3.3 0.037 TAS5548
3.7VA 1 3.3 / 74HCT244
3.7VA 3.5 3.3 0.001 Pick Up
3.7VA 7.8 3.3 0.003 CS5346
3.7VA 15 3.3 0.006BX8805
3.3V3.3V LDO LM1117_1.2V 52 52 1.2 0.109 0.109
3.3V Diode& Triode 6 6 1.5 0.011 0.011 BU9543KV
5VA
5V / / 36 36 5 V / CS5346
5V / / Normal : 110
5 / / S3053Peak 400
5.6VA 5.6V LDO 0IPMGKE018A 72/80 50.043 0.043
USB/0.048 /0.048
Vkk 26V / / 2 2 26 / / MC3401
F+ 20.2V / / 140 140 20.2 / / VFD
12V
12V / / 88
288
12 / / 8 Blue LED
12V / / 90 12 / / FAN
12V / / 110 12 / / TAS5612LA
PVDD26/29.1V / /
3000Peak 3A 26/29.1 / / TAS5612LA
(2 CH)
26/29.1V / / 6000 Peak 6A 26/29.1 / / TAS5612LA
Output Voltage Current (mA) Remark
SMPS
3.7VReading 262
Max 280
5VReading 410
Operation (Normal) 180
12VVOL < 20 180 Fan : not Work.
VOL > 20 250 Fan : Work.
PVDD 2 CH 3000 Max
PRINTED CIRCUIT BOARD DIAGRAMS
1. SMPS P.C.BOARD (TOP VIEW)
(BOTTOM VIEW)
NOTE) WarningParts that are critical with respect to riskof fire or electrical shock.
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3-59 3-60
2. MAIN P.C.BOARD (TOP VIEW)
(BOTTOM VIEW)
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3-61 3-62
3. FRONT P.C.BOARD (TOP VIEW) (BOTTOM VIEW)
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3-63 3-64