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TV/CATV doesn't display
Check TU500 Pin15(Video output),
Pin17(Sound output)
Can you see the normal signal?
Check the output of TR(Q503).
Can you see the normal waveform?
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
This board has big problem because
Main IC(IC100) have some troubles.
After checking thoroughly all path once
again, You should decide to replace
Main Board or not.
Copyright
2008
LG Electronics. Inc. All right reserved.
C
Only for training and service purposes
TROUBLESHOOTING
NO
YES
NO
YES
NO
YES
Could you measure voltage of
TU500 & IIC lines?
Are they all normal?
YES
You should replace TUNER.
You should decide to replace TR(Q503)
or not.
After checking the Power of Main
IC(IC100) you should decide to replace
Main IC or not.
- 19 -
NO
You should check power line
& IIC lines.
LGE Internal Use Only
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