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Do you have audio? If you feed it an RF video signal with actual program material will it pass that to the outputs?
I ask because you mentioned in your old thread that you were testing with a flatpannel set and no signal to the VCR tuner....Some flat panels are finicky and won't show a picture unless the signal they get is near perfect.
If audio and video are dead even thru the tuner you will need to get a service manual and a oscilloscope to troubleshoot it....Or get an ESR meter and some new caps and HOPE it is a bad cap and that you manage to find and replace it.
If only the tape video is dead the tape heads are either dirty or bad, or the signal chain has a problem.
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