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So, you are saying you have gotten HV back and have a raster again and now back to the point of not able to tune in video?
So it's suggested again that you try a longevity run with video input at test point B, like you had it hooked up there before, ( removing 3rd IF V3), and work on sound and tuning after.
And as it says on the schematic, all voltages and waves are taken with test pattern input, w/o such input, it's understandable that voltages and waveforms will fluctuate as there is nothing to lock them into “normal” ranges.
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