This VIC-20 has a weird switch connected to it and internally has a speaker attached. The switch seems to be some kind of s-video mod but the video output is messed up:
With old computers like this it’s a good idea to replace the capacitors so I give that a try first as the computer does seem to be putting out a signal. Replaced the big caps on the motherboard and also the caps in the RF modulator.
And what do you know this seems to have done the trick. I guess one of the RF modulator caps must have been bad. At some point soon I’m going to remove the switch mod but leave the internal speaker if possible. Also this case is in dire need of some Retrobrite love!