Read LG 42LM3400 (CHASSIS:LT21C) Service Manual online
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TROUBLE SHOOTING
No power
Check 24V, 12V, 3.5V
of Power B/D
Check short of Main B/D
or Change Power B/D
Pass
Check Output of
Q403, IC407, IC401
Check P403 Connector
Change LED Assy
: [A] PROCESS
Fail
Fail
Pass
Pass
Check LED Assy
Check short of
IC402, IC403
Pass
Check short of
Q403, IC407, IC401
Fail
Re-soldering or Change defect
part of Q403, IC407, IC401
Fail
Re-soldering or Change defect
part of Q403, IC407, IC401
Fail
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