System Part - LG LHD625 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?
IC108: 3.3 VA,
IC102: 1.5 V, IC105 : 3.3 V
OK?
X500
27.000 MHz
OK?
Replace IC500 MT1389.
3.3 VA OK?
2-43
NO
YES
NO
YES
NO
YES
NO
Check IC103
and 5.5 VA on SMPS board.
Check IC108 / IC102 / IC105
and SMPS board.
Replace X500.
Main Board
Check CN305 pin11.
Front Board