LG Electronics 42CS669C-ZD service manual Digital TV Audio, Analog TV Audio, ok No

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10. Digital TV Audio

Check RF Cable & Signal.

Check Tuner 3.3V Power

L3703.

Check Tuner 1.8V Power.

IC3703 2 pin : 1.8V

Check IF_P/N Signal

TU3700 10/11 Pin.

Follow procedure ’9. All source audio’ trouble shooting guide.

Replace L3703.

Replace IC3703.

Bad Tuner. Replace Tuner.

11. Analog TV Audio

Check RF Cable & Signal.

Check Tuner 3.3V Power

L3703.

Check Tuner 1.8V Power

IC3703 2 pin : 1.8V.

Check CVBS Signal

TU3700 8 Pin.

Follow procedure ’9. All source audio’ trouble shooting guide.

Replace L3703.

Replace IC3703.

Bad Tubner. Replace Tuner.

Copyright ©2012 LG Electronics. Inc. All right reserved.	- 20 -	LGE Internal Use Only
Only for training and service purposes

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Contents CHASSIS LD0AW SERVICE MANUALREAD THE SAFETY PRECAUTIONS IN THIS MANUAL http//aic.lgservice.comCONTENTS CONTENTSPRODUCT SAFETY SPECIFICATIONSAFETY PRECAUTIONS IMPORTANT SAFETY NOTICEGeneral Guidance Before returning the receiver to the customerSERVICING PRECAUTIONS Electrostatically Sensitive ES DevicesIC Remove/Replacement ReplacementSmall-Signal Discrete Transistor Removal/Replacement Power Output, Transistor Device Removal/ReplacementSPECIFICATION 4. Model General Specification1. Application range 3. Test method5. Component Video Input Y, CB/PB, CR/PR 6. RGB Input PC2 PC Mode 7. HDMI Input PC/DTV1 DTV Mode ADJUSTMENT INSTRUCTION 1. Application Range2. Designation 3. Main PCB check process3.1. ADC Process 3.2. EDID Download3.3. EDID data After downloading, have to adjust Tool Option again4. Total Assembly line process 4.1. Adjustment Preparation3.4. Function Check Manual W/B process using adjusts Remote control4.3. Outgoing condition Configuration 6.1. Signal TABLE6.2. Command Set 5. GND and HI-POT Test7. CI+ Key Download method No No No No No TROUBLESHOOTING1. Power-up boot check No No No No 2. Digital TV Video3. Analog TV Video 4. AV Video 5. Component VideoNo No No ok No 6. SCART Video 7. RGB Video8. HDMI Video Check HDMI Cable conductors for damage or open conductor9. All Source Audio 10. Digital TV Audio 11. Analog TV Audio14. RGB Audio 12. AV Audio13. Component/ SCART Audio DIAGRAM BLOCKSide RearEXPLODED VIEW Only for training and service purposes GP3S7LRCopyright 2012 LG Electronics. Inc. All rights reserved LGE Internal Use OnlyNormal Power VDDCNormal DDR3FROM LIPS & POWER B/D PowerDET+3.3VNormal +1.5VDDRCONTROL IR & LED USBDIODES IC1450HDMI EEPROM HDMI1SIDEHDMI GP3S7LR20110324 HDMI8New Item Development RGB/SPDIF/PC/HPRS232C GP3S7LR RS232C9PINOnly for training and service purposes GP3S7LR DDR256 DDR3 1.5V By CAP - Place these Caps near MemoryIC1201-*1 K4B1G1646G-BCH9GP3S7LR SFLASH IC1401-*1GP3S7LR 20110511TUNERL GP4RGLOBALTUNERBLOCKGP3S7LR NTP7400 IC501 NTP-7400LFull Scart/ Comp1 GP3S7LR REAR JACKSIDE COMPONENT PHONE JACK New Item Developmen CI Region Option name of this page CISLOT because of Hong KongGP3S7LR PCMCI 10067972-0500LFGASKET SMD GASGP3 S7LR 20110324