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Too many unknown factors with that, what is the peak to peak output at that point on that video buffer chip? You need 5v, is it inverted or not inverted?
The Sony schematic gives no clues as what the video signal is, only hints of a 5v vertical blanking pulse at q402.
The idea of this seems much more trouble than it's worth over a VCR.
Cable boxes do sometimes have composite A/V output that can be used for this such a thing, but you also need to input test patterns for convergence, so a VCR'S tuner is more flexible.
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