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Again, this is a situation where having an oscilloscope would be extremely helpful.
If sound is good, then tuner & IF up to #3 are most likely OK, as the sound is taken off the 3rd video IF V3. So the problem should be after that in L6 and after, the video detector may be faulty, or any one of those peaking coils between L6 & V4 P7.
If you did have a oscilloscope, the method would be to check for the 5v PTP video, starting from the anode of x6, and trace it down to V4 P7 to check it has a clear path.
But w/o one, it's much harder, check everything starting with x6 → V4 P7.
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