Trouble Shooting - LG 60LB5900 Service Manual

1. Power-up boot check
Check stand-by Voltage.
P401 3, 5, 6pin : +3.5V_ST
ok
Check Micom Voltage
L206 : +3.3V (AVDD_NODIE)
ok
Check X101 clock
24 MHz
ok
Check P401 PWR_ON.
1pin : 3.3V
ok
Check Multi Voltage
P401 9pin:24V ,13pin:12V
ok
Check IC403/4 Output Voltage
IC403 : 1.15V / IC404 : 1.5V
Q406 : 3.3V
ok
Check LVDS Power Voltage
Q405 : 12V
ok
Check Mstar LVDS Output
ok
Check Inverter Control
P401 2 pin : High
ok
Change Module
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Only for training and service purposes

TROUBLE SHOOTING

No
Check Power connector
No
Replace L206
No
Replace X101
No
Re-download sof tware.(IC102, IC1300)
No
Replace Power Board
Replace IC403/4, Q406
No
No
Replace Q405
No
Replace Mstar(IC101) or Main Board
No
Check Power Board or Module
Main B/D 3.5V Line
ok
Short Check
No
Replace Mstar(IC101) or Main board
- 17 -
ok
Replace Power board.
LGE Internal Use Only