so this monitor was working but colors weren't great and had never been capped. Did cap kit, removed and reflowed solder on header pins, restored tube (I would say it is still out of spec but there is life on all guns can pass cut-off tests etc).
Put everything back and things were looking good with decent picture. Then while adjusting or having it on the bench running for a bit, BAM! Red Gun seems to be stuck on and getting retrace lines.
Put tube back on CR7000 and, as before, there is some leakage on red gun during g1 short test but it is not shorted.
swapped p317 interface board with known working, same result. <this eliminates all the tr204-06 transistors
removed tr401-03 on neck board and tested with diode test == all tested good.
Reflowed solder on ground wire and tested all ground points == good
Any other hints to narrow this down further. Should I remove tr401 and see what the behavior is or is there an easier way to turn the red gun completely off safely?
this image is with black level about midway. If I turn black level all the way down it is just red w/ retrace lines
Put everything back and things were looking good with decent picture. Then while adjusting or having it on the bench running for a bit, BAM! Red Gun seems to be stuck on and getting retrace lines.
Put tube back on CR7000 and, as before, there is some leakage on red gun during g1 short test but it is not shorted.
swapped p317 interface board with known working, same result. <this eliminates all the tr204-06 transistors
removed tr401-03 on neck board and tested with diode test == all tested good.
Reflowed solder on ground wire and tested all ground points == good
Any other hints to narrow this down further. Should I remove tr401 and see what the behavior is or is there an easier way to turn the red gun completely off safely?
this image is with black level about midway. If I turn black level all the way down it is just red w/ retrace lines


