22LD310 (CHASSIS:LP92A) - LG TV Service Manual (repair manual). Page 29

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TROUBLE SHOOTING GUIDE
No power
(LED indicator off)
[A] PROCESS
Check 24V, 12V, 5,2V 
of Power B/D
Check short of Main B/D 
or Change Power B/D
Fail
Pass
Check Output of 
IC701, IC702, IC704,Q705
Fail
Check short of IC701, IC702, IC704 
Re-soldering or Change defect
Part
Fail
IC701, IC702, IC704,Q705
Pass
Change IC701, IC702, IC704
Pass
Part.
Change LED Assy
Pass
Check LED Assy
Fail
Check P201 Connector 
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