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DTV doesnt display
Check the output data of TU800
Pin 24~34
Can you see the normal signal?
NO Could you measure voltage of
TU800 & IIC lines?
Are they all normal?
NO You should check power line
& IIC lines.
YES
You should replace TUNER.
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
NO After checking the Power of Main
IC(IC100) you should decide to replace
Main IC or not.
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.