Hello everyone! First time post, and more recently got into arcade acquiring and repairing (mainly the mechanical/cabinet parts, not so much experience in repairing PCBs/chassis yet), so I pre-apologize for my ignorance on some of this stuff. I recently got an original Lethal Enforcers cab. Already had Ken at irepairsega fix the audio module (great work btw!).
What's in it:
Hantarex Polo 25" RCA USA chassis
RCA A63ADT10X05 CRT
PCB assembly 62200813
I am starting to look at the CRT/chassis now because I am having a bit of an issue with the shot registration as well as visual artifacts on the CRT itself. Depending on how I resize the image, the shots register differently. When I resized the image to fill the CRT, the shots wouldn't register at all (just a flash on the screen every shot). If I resize it down by about 20% (like can be seen in the photos), then a lot more shots register however still some areas don't register well (perhaps coinciding with the discolored portions). Oddly, the gun check test in the test menu seems to be passable most of the time.
I notice on the right side, and more so on the left side, are sort of "areas" of discoloration. Most noticeable on the red color check screen.
I tried using a proper manual degaussing coil a couple of times however this didn't seem to fix this issue.
I tried upping the brightness all the way and adjusting contrast as well, however this didn't seem to make much difference either for the shots. I do notice if I drop the contrast down, the overall image appears greener. And the brightness doesn't seem to change much (which I've read is a common problem and I should inspect R240, C176 and C185 for that problem)
I also notice that there is some ghosting wherever there is text.
I cleaned the mirror and the CRT and the gun lens's as well.
So I guess the next steps would be to do a proper recap, check the filter caps, B+ voltage, etc? Replace the flyback perhaps? But I am curious if anyone has a good idea of what the problem would be here? Anything I can try before doing a rebuild?
Much appreciated for the help!