Dtv Doesn’t Display - LG M227WD Service Manual

DTV doesn't display
Check the output data of TU500
Pin 24~34
Can you see the normal signal?
YES
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
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.
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C
Only for training and service purposes
Could you measure voltage of
NO
TU500 & IIC lines?
Are they all normal?
You should replace TUNER.
After checking the Power of Main
NO
IC(IC100) you should decide to replace
Main IC or not.
- 20 -
NO
YES
You should check power line
& IIC lines.
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