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20LCD-H5, 20L-510LT (CHASSIS:LJ71A) - LG TV Service Manual (repair manual). Page 14

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TROUBLE SHOOTING
1. No Power (LED indicator off) : [A] Process
- 14 -
Check 15V or
ST_5V of Power B/D.
Fail
Pass
Check short of Main B/D
or Change Power B/D.
Check Output of
IC1000, IC1004.
Fail
Check short of
IC100, Q308.
Pass
Pass
Fail
Re-soldering or Change
defect part of IC100, Q308.
Change IC1000, IC1004.
Pass
Change IC1006, IC1005.
Check Output of
IC1006, IC1005.
Fail
Check short of
Q308, TU600, IC500.
Fail
Re-soldering or Change
defect part of Q308,
TU600, IC500.
Pass
Pass
Change IC1002, IC1003.
Change LED Assy.
Check Output of
IC1002, IC1003.
Pass
Check LED Assy.
Pass
Check P306 Connector.
Fail
Check short of
IC100, IC400.
Fail
Fail
Re-soldering or Change
defect part of IC100, IC400.
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