Troubleshooting - LG 42LK430 Service Manual
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Also See for 42LK430:
- Owner's manual (184 pages) ,
- Manual del usuario (106 pages) ,
- Brochure & specs (28 pages)
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1. Power-up boot check
Check stand-by Voltage.
P403 9~12pin : +3.5V_ST
ok
Check Micom Voltage.
L404 : +3.5V
ok
Check X201 clock.
24 MHz
ok
Check P403 PWR_ON.
1pin : 3.3V
ok
Check Multi Voltage.
P403 2pin:24V, 17pin:12V
ok
Check IC402/3/7 Output Voltage.
IC402 : 2.5V
IC403 : 1.1V
IC407 : 1.5V
Q403 : 3.3V
ok
Check LVDS Power Voltage.
Q409 : 12V
ok
Check Mstar LVDS Output
ok
Check Inverter Control & Error Out.
P403 18 pin : High
P403 24 pin : low
ok
Change Module.
Copyright ©2011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TROUBLESHOOTING
No
Check Power connector.
No
Replace L404.
No
Replace X201.
No
Re-download software.
No
Replace Power Board.
No
Replace IC402/3/7, Q403.
No
Replace Q409.
No
Replace Mstar(IC101) or Main Board.
No
Check Power Board or Module.
- 14 -
ok
Main B/D 3.5V Line
Short Check
No
Replace Mstar(IC101) or Main board.
ok
Replace Power board.
LGE Internal Use Only
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