System Part - LG LHB675FB Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

3. SYSTEM PART

Power on
YES
Stand-by LED
OK?
YES
3A
3B
NO
5.5 VA, 3.3 VA
OK?
IC101: 3.3 VA /
IC151: 1.5 V, 1.2 V /
IC156 : 3.3 V OK?
X501
27.000 MHz
OK?
Replace IC501 MT8563.
3.3 VA OK?
2-48
NO
YES
NO
YES
NO
YES
NO
Check IC155
and 5.5 VA on SMPS board.
Check IC101 / IC151 / IC156
and SMPS board.
Replace X501.
Main Board
Check CN305 pin11.
Front Board