I have a used Datavideo TBC-1000 for sale, which needs repair. The unit powers on but the video signal does not come through clean (complete pixelation) though there is audio that passes through. This is the same with RCA or s-video. Possibility that the caps need to be replaced. I opened up the unit and I did not see any obvious swelling of the capacitors.
The unit is being sold as is. Considering the market for these I'm listing it at $750 plus shipping (or best offer). Happy to answer any other questions.