Trouble Shooting - LG 55LF6000-UB Service Manual

1. Power-up boot check
Check PSU DC Voltage
P401_5,6,7,8 pin : 13.2V
ok
Check stand-by Voltage.
L413 : +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 DC Output Voltage
IC400 : 1.15V+5V / IC404 : 1.5V
Q406 : 3.3V
ok
Check LVDS Power Voltage
Q405 : 13.2V
ok
Check Mstar LVDS Output
ok
Check Inverter Control
P401_11pin : High
ok
Change Module
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Only for training and service purposes

TROUBLE SHOOTING

Replace PSU
Main B/D 3.5V Line
No
Short Check
No
Replace L206
No
Replace X101
Re-download sof tware.
No
(IC102, IC1300)
Replace IC400, IC404, Q406
No
No
Replace Q405
No
Replace Mstar(IC101) or Main Board
No
Check Power Board or Module
- 14 -
ok
Replace IC405 (DCDC)
No
Main B/D 3.5V Line
Short Check
LGE Internal Use Only