Recurring 6100 x-axis collapse

alfonzotan

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I'm having X-axis collapse on the 6100 in my Tempest again... same thing I've seen several times in the past, Fonzie test or tapping the deflection board with a ruler 'fixed' it temporarily. Went in and repeated what had fixed it for about a year: removed and reflowed the X side frame transistor connector pins, and also cleaned off a bunch of old flux that had accumulated during many repairs; no change to the collapse (actually the spot killer went from intermittent to permanent). Pulled the board again and reflowed the two big x-axis transistors, now I have half collapse (left or "top" half), so at least that's progress.

Frame transistors and the two X deflection transistors all test out okay, good continuity and no shorts found in the reworked joints. Any suggestions welcome.
 
If you've been resoldering stuff like a crazy monkey, then perhaps also consider hairline cracks in a PCB trace or two? 🐵🙊
Sometimes you need a good microscope to see this kinda stuff. YMMV
 
Went through a few rounds of making it worse before it got better (which is my standard for repairs, unfortunately)... finally found one pin on the X-axis connector that wasn't showing continuity, patched it to the next component with some resistor leg. Then when I put the board back in and powered up... everything was dead. No spot killer, no spot with the brightness all the way up. Said bad words. Checked in with @andrewb for suggestions. Watched crappy basketball and went to bed.

Rechecked the system again today using Andy's invaluable guide, found Q102 was bad. Replaced, put everything back together, and I'm back in business. I'll give it a long test sometime this weekend to be sure.
 
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