LG 55LV355C-UA, Service Manual

Page: 15 / 47

- 15 - LGE Internal Use Only Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes
TROUBLESHOOTING GUIDE
1. Power-up boot check
Check stand-by Voltage.
P403 9~12pin : +3.5V_ST
Check Power connector
Main B/D 3.5V Line
Short Check
Check X1002 clock
32 KHz
Replace X1002
Check P403 PWR_ON.
1pin : 3.3V
Replace Micom(IC1002) or Main board
Check Multi Voltage
P403 2pin:24V or 24V ,17pin:12V
Replace Power Board
Check Inverter Control & Error Out
P403 18 pin : High
P403 24 pin : low
Check Power Board or Module
Check IC402/3/5/7 Output Voltage
IC402 : 2.5V
IC403 : 1.26V
IC405 : 3.3V
IC407 : 1.5V
Replace IC402/ 3 / 5 / 7
Re-download Micom software.
Check Micom Voltage
IC1002 pin 48 : +3.5V
Replace L404
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
ok
ok No
No
No
No
No
No
No
No
No
No
Check X201 Clock
24 MHz
Replace X201
ok
No
Replace Power board.
ok