Troubleshooting - LG M1994A-PTJ Service Manual

CHECK 15V or ST_5V
of Power B/D
Pass
Check Output of
IC201 (3.3V),
IC203(1.8V)
Pass
Check Output of
IC207 (11V)
Pass
Check Output of
IC206 (3.3V),
IC208(1.8V)
Pass
Check LED Assy.
Pass
Check P201 Connector.
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Only for training and service purposes

TROUBLESHOOTING

1. NO POWER (LED INDICATOR OFF) : [A] Process
Fail
Fail
Fail
Fail
Fail
Check 15V or ST_5V
of Power B/D
Check short of
IC301, Q205
Pass
Change IC201, IC203
Check short of
IC204
Pass
Change IC207
Check short of
IC301, IC200
Pass
Change IC206, IC208
Change LED Assy.
5V
- 17 -
Fail Re-soldering of Change
defect part of IC301,Q205
Re-soldering of Change
Fail
defect part of IC204
Re-soldering of Change
Fail
defect part of IC301,IC400
15V
LGE Internal Use Only