Troubleshooting - LG 42LH20R Service Manual

No power
(LED indicator off)
Check 24V, 12V, 5,2V
of Power B/D
Pass
Check Output of
IC1001, IC1003, IC1007
Pass
Check LED Assy
Pass
Check P307 Connector
No Raster
Pass
Check LED status
On Display Unit
Pass
Check Panel Link Cable
Or Module
Pass
Check Inverter Connector
Or Inverter
Pass
Check Output of IC802
Pass
Check LVDS Cable
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes

TROUBLESHOOTING

[A] PROCESS
:
Fail
Fail
Fail
[B]: Process
Fail
Fail
Fail
Fail
Fail
Check short of Main B/D
or Change Power B/D
Check short of IC1001,
IC1003, IC1007
Pass
Change IC1002,, Q1003
Change LED Assy
Repeat A PROCESS
Change Panel Link Cable
Or Module
Change Inverter Connector
Or Inverter
Change IC802
Change Module
- 14 -
Fail
Re-soldering or Change defect
part of IC1001, IC1003, IC1007
LGE Internal Use Only