LG 32LN54 series - Troubleshooting; Power-up Boot Check Procedures

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Only for training and service purposes
TROUBLESHOOTING
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 M star(IC101) or Main board.
Check Multi Voltage
P401 9, 10pin : 24V
/ 13, 14, 15pin:12V
Replace Power Board.
Check DRV ON Control
P403 2 pin : High
Check 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 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