LG LHD645 Service Manual

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ELECTRICAL TROUBLESHOOTING GUIDE
3. SYSTEM PART
Power on
YES
Main Board
Front Board
Check IC103
and 5.5 VA on SMPS board.
Replace X500.
Stand-by LED
OK?
5.5 VA, 3.3 VA
OK?
X500
27.000 MHz
OK?
NO
NO
NO
YES
Check IC108 / IC102 / IC105
and SMPS board.
Check CN305 pin11.3.3 VA OK?
IC108: 3.3 VA,
IC102: 1.5 V, IC105 : 3.3 V
OK?
NO
NO
YES
YES
YES
3A
Replace IC500 MT1389.
3B

LG LHD645 Specifications

General

Brand	LG
Model	LHD645
Category	Home Theater System
Language	English