Read LG 42LA6150 (CHASSIS:LA33B) Service Manual online
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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 IC402/3/7 Output Voltage
IC402 : 2.5V
IC403 : 1.15V
IC407 : 1.5V
Q403 : 3.3V
Replace IC402, IC403, IC407, Q403
Re-download software.
Check stand-by Voltage
L404, L408 : +3.5V
Replace L404, L408
Check LVDS Power Voltage
Q409 : 12V
Replace Q409
Check M star LVDS Output
Replace M star(IC101) or M ain Board
ok
ok
ok
ok
ok
ok
ok
No
No
ok
Replace Power board.
ok
No
No
No
No
No
No
No
Check DRV ON Control
P403 2 pin : High
Check Power Board
Change M odule
ok
No
ok
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