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19LS4R (CHASSIS:LP73A) - 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
IC1100, IC1101.
Fail
Check short of
IC100, Q307.
Pass
Pass
Fail
Re-soldering or Change
defect part of IC100, Q307.
Change IC1100, IC1101.
Pass
Change IC1102, IC1103.
Check Output of
IC1102.
Fail
Check short of
Q307, TU600, IC500.
Fail
Re-soldering or Change
defect part of Q307,
TU600, IC500.
Pass
Pass
Change IC1104, IC1105.
Change LED Assy.
Check Output of
IC1104, IC1105.
Pass
Check LED Assy.
Pass
Check P304 Connector.
Fail
Check short of
IC100, IC400.
Fail
Fail
Re-soldering or Change
defect part of IC100, IC400.
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