LG 42lk530 Service Manual page 52

1. Trouble shooting - No power
Check stand-by Voltage.
P501 9~12pin : +3.5V_ST
ok
Check Micom Voltage
IC602 pin 48 : +3.5V
ok
Check X602 clock
32 KHz
ok
Check P501 PWR_ON.
1pin : 3.3V
ok
Check Multi Voltage
P501. 2 pin : *24V , 17 pin : 12V
ok
Check IC501/4/5/8 Output Voltage
IC501 : 0.9V, IC508 : 1.5V
IC504 : 2.5V ,IC505 : 3.3V
ok
Check X101 Clock
54 MHz
ok
Check LVDS Power Voltage
Q507 : 12V
ok
Check Inverter Control
P501 18 pin : High
ok
Change Module
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Only for training and service purposes
No
Check Power connector
No
Replace L503
No
Replace X602
No
Re-download Micom software.
No
Replace Power Board
No
Replace IC501/4/5/8
No
Replace X101
No
Replace Q507
No
Check Power Board or Module
Main B/D 3.5V Line
ok
Short Check
No
Replace Micom(IC602 ) or Main board
ok
Replace Power board.
LGE Internal Use Only