No
Video
Is video present after connecting a
signal to one of the AV inputs and
selecting that input?
Does video appear after reseating
the ribbon cables connecting the
power supply to the digital board?
No
Replace the
power supply
board.
Yes
Is tuner video present
after auto-programming?
Replace the digital
main board.
No
Yes
No
Check remaining
inputs.
Yes
Does video return after
connecting an antenna and
auto-programming.
No
Check remaining
inputs.
Yes
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