Trouble Shooting - No Power - LG 42LE5400 Service Manual

1. Trouble shooting - No power

Check stand-by Voltage.
P8000 9~12pin : +3.5V_ST
ok
Check Micom Voltage
IC8101 pin 48 : +3.5V
ok
Check X8101 clock
32 KHz
ok
Check P404 PWR_ON.
1pin : 3.3V
ok
Check Multi Voltage
P8000 2 pin : *20V , 17 pin : 12V
ok
Check IC402/3/5/7 Output Voltage
IC8001 : 1.2V, IC8003 : 1.8V
IC8004 : 2.5V ,IC8005 : 3.3V
ok
Check X1001 Clock
54 MHz
ok
Check LVDS Power Voltage
Q8004 : 12V
ok
Check FRC(IC9001)LVDS Output
ok
Check Inverter Control
P8000 18 pin : High
ok
Change Module
Copyright ⓒ 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
No
Check Power connector
No
Replace L8003
No
Replace X8101
No
Re-download Micom software.
No
Replace Power Board
No
Replace IC8001/ 3 /4 / 5
No
Replace X1001
No
Replace Q8004
Check IC402/3/5/7 Output Voltage
No
IC8903 : 3.3V, IC8001 : 1.5V
IC8902 : 1.2V
No
Check Power Board or Module
Main B/D 3.5V Line
ok
Short Check
No
Replace Micom(IC8101 ) or Main board
No
Replace IC8901/ 2/ 3
OK
Replace FRC(IC9001)or Main Board
ok
Replace Power board.
LGE Internal Use Only