LG 42LN541C, Service Manual

Page: 14 / 34

- 14 - LGE Internal Use Only Copyright © 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
M ain B/D 3.5V Line
Short Check
Check X201 clock
24 M Hz
Replace X201
Check P401 PWR_ON.
1pin : 3.3V
Replace M star(IC101) or M ain board
Check M ulti 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 M star LVDS Output
Replace M star(IC101) or M ain Board
Change M odule
ok
ok
ok
ok
ok
ok
ok
ok
ok No
No
ok
Replace Power board.
ok
No
No
No
No
No
No
No
No