Read LG 32LD550 (CHASSIS:LA02B) Service Manual online
1. Power-up boot check
Check stand-by Voltage.
P8000 9~12pin : +3.5V_ST
Check Power connector
Main B/D 3.5V Line
Short Check
Check X8101 clock
32 KHz
Replace X8101
Check P404 PWR_ON.
1pin : 3.3V
Replace Micom(IC8101 ) or Main board
Check Multi Voltage
P8000 2 pin : *20V , 17 pin : 12V
Replace Power Board
Check Inverter Control
P8000 18 pin : High
Check Power Board or Module
Check IC402/3/5/7 Output Voltage
IC8001 : 1.2V
IC8003 : 1.8V
IC8004 : 2.5V
IC8004 : 2.5V
IC8005 : 3.3V
Replace IC8001/ 3 /4 / 5
Re-download Micom software.
Check Micom Voltage
IC8101 pin 48 : +3.5V
Replace L8003
*20V Voltage is dependent on Model
32/42/46LD550 , 47LD650 => 20V
52/60LD550 , 55LD650 => 24V
32/42/46LD550 , 47LD650 => 20V
52/60LD550 , 55LD650 => 24V
Check LVDS Power Voltage
Q8004 : 12V
Replace Q8004
Check FRC(IC9001)LVDS Output
Replace FRC(IC9001)or Main Board
Change Module
ok
ok
ok
ok
ok
ok
ok
ok
ok
ok
No
No
No
No
No
No
No
No
OK
No
Check X1001 Clock
54 MHz
Replace X1001
ok
No
Replace Power board.
ok
Check IC402/3/5/7 Output Voltage
IC8903 : 3.3V
IC8001 : 1.5V
IC8001 : 1.5V
IC8902 : 1.2V
No
Replace IC8901/ 2/ 3
No
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