Trouble Shooting - LG 23LS7D Service Manual

1. No Power (LED indicator off) : [A] Process
Check 12V or
ST_5V of Power B/D.
Pass
Check Output of
IC1000, IC1004.
Pass
Check Output of
IC1006, IC1005.
Pass
Check Output of
IC1002, IC1003.
Pass
Check LED Assy.
Pass
Check P306 Connector.

TROUBLE SHOOTING

Fail
Check short of Main B/D
or Change Power B/D.
Fail
Check short of
IC100, Q308.
Change IC1000, IC1004.
Fail
Check short of
Q308, TU600, IC500.
Change IC1006, IC1005.
Fail
Check short of
IC100, IC400.
Change IC1002, IC1003.
Fail
Change LED Assy.
- 11 -
Fail
Re-soldering or Change
defect part of IC100, Q308.
Pass
Re-soldering or Change
Fail
defect part of Q308,
TU600, IC500.
Pass
Fail
Re-soldering or Change
defect part of IC100, IC400.
Pass