LG Electronics 42CS669C-ZD service manual Troubleshooting, Power-up boot check, No No No No No

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TROUBLESHOOTING

1. Power-up boot check

Check stand-by Voltage.	No
Check stand-by Voltage.
P403 9~12pin : +3.5V_ST
ok
Check Micom Voltage.	No
Check Micom Voltage.
L404 : +3.5V

Check X201 clock. 24 MHz

Check Power connector.

Replace L404.

Replace X201.

Main B/D 3.5V Line

Short Check

Replace Power board.

Check P403 PWR_ON.

1pin : 3.3V

Re-download software.

Replace Mstar(IC101) or Main board.

Check Multi Voltage. P403 2pin:24V, 17pin:12V

Check IC402/3/7 Output Voltage.

IC402 : 2.5V

IC403 : 1.1V

IC407 : 1.5V

Q403 : 3.3V

Check LVDS Power Voltage.

Q409 : 12V

Check Mstar LVDS Output

Check Inverter Control & Error Out. P403 18 pin : High

P403 24 pin : low

Change Module.

No

Replace Power Board.

Replace IC402/3/7, Q403.

Replace Q409.

Replace Mstar(IC101) or Main Board.

Check Power Board or Module.

Copyright ©2012 LG Electronics. Inc. All right reserved.	- 14 -	LGE Internal Use Only
Only for training and service purposes

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Contents READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS LD0AWSERVICE MANUAL http//aic.lgservice.comPRODUCT SAFETY CONTENTSCONTENTS SPECIFICATIONGeneral Guidance SAFETY PRECAUTIONSIMPORTANT SAFETY NOTICE Before returning the receiver to the customerSERVICING PRECAUTIONS Electrostatically Sensitive ES DevicesSmall-Signal Discrete Transistor Removal/Replacement IC Remove/ReplacementReplacement Power Output, Transistor Device Removal/Replacement1. Application range SPECIFICATION4. Model General Specification 3. Test method5. Component Video Input Y, CB/PB, CR/PR 6. RGB Input PC2 PC Mode 7. HDMI Input PC/DTV1 DTV Mode 2. Designation ADJUSTMENT INSTRUCTION1. Application Range 3. Main PCB check process3.3. EDID data 3.1. ADC Process3.2. EDID Download After downloading, have to adjust Tool Option again3.4. Function Check 4. Total Assembly line process4.1. Adjustment Preparation Manual W/B process using adjusts Remote control6.2. Command Set 4.3. Outgoing condition Configuration6.1. Signal TABLE 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 No No No 4. AV Video5. Component Video ok No6. 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 Side DIAGRAMBLOCK RearEXPLODED VIEW Copyright 2012 LG Electronics. Inc. All rights reserved Only for training and service purposesGP3S7LR LGE Internal Use OnlyNormal Normal PowerVDDC DDR3+3.3VNormal FROM LIPS & POWER B/DPowerDET +1.5VDDRCONTROL IR & LED USBDIODES IC1450SIDEHDMI HDMI EEPROMHDMI1 GP3S7LR20110324 HDMI8New Item Development RGB/SPDIF/PC/HPRS232C GP3S7LR RS232C9PINSPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION IC1201-*1 GP3S7LR DDR256DDR3 1.5V By CAP - Place these Caps near Memory K4B1G1646G-BCH9GP3S7LR SFLASH IC1401-*1TUNERL GP3S7LR20110511 GP4RGLOBALTUNERBLOCKGP3S7LR NTP7400 IC501 NTP-7400LFull Scart/ Comp1 GP3S7LR REAR JACKSIDE COMPONENT PHONE JACK New Item Developmen GP3S7LR PCMCI CI RegionOption name of this page CISLOT because of Hong Kong 10067972-0500LFGP3 S7LR GASKETSMD GAS 20110324