LG 42LN541C Service Manual

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LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLE SHOOTING
1. Power-up boot check
Check stand-by Voltage.
P401 3, 5pin : +3.5V_ST
Check 18pin Power connector
Main B/D 3.5V Line
Short Check
Check X201 clock
24 MHz
Replace X201
Check P401 PWR_ON.
1pin : 3.3V
Replace Mstar(IC101) or Main board
Check Multi Voltage
P401 9, 10pin : 24V
/ 13, 14, 15pin:12V
Replace Power Board
Check DRV ON Control
P401 2 pin : High
Check Power Board
Check IC402/3/7 Output Voltage
IC402 : 2.5V
IC403 : 1.15V
IC404 : 1.5V
Q408 : 3.3V
Replace IC402, IC403, IC404, Q408
Re-download software.
Check stand-by Voltage
L402, L403 : +3.5V
Replace L402, L403
Check LVDS Power Voltage
Q406 : 12V
Replace Q406
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
Change Module
ok
ok
ok
ok
ok
ok
ok
ok
okNo
No
ok
Replace Power board.
ok
No
No
No
No
No
No
No
No

LG 42LN541C Specifications

General

Brand	LG
Model	42LN541C
Category	LED TV
Language	English