Read LG 42LC7D (CHASSIS:LB73A) Service Manual online
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Check the output data of TU800 Pin 21~28
Can you see the normal signal?
YES
Could you measure voltage of TU800 & IIC
lines?
Are they all normal?
You should check power line & IIC lines.
You should replace TUNER.
YES
NO
Check the input and output of HD2.4(IC401).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
This board has big problem because Main
chip(HD2.4) have some troubles.After checking
thoroughly all path once again, You should
decide to replace HD2.4 or not.
NO
NO
DTV doesn’t display
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