I've got a late era WG 19K7000 (7901 to be exact) kicking my butt. It's dated 1994....I didn't know they were making 7000 at that time. It's got a hum bar from hell. It was in a Galaga. I moved the monitor from the game to my bench....problem remained (with a different motherboard and different power supply). The problem is definately the monitor. The B+ is right at 124VDC. I swapped the filter cap....no change. I swapped the regulator IC...no change. It looked as if it had just recently been capped....I re-capped it anyway, just to see.....no change. All solder joints look good. The hum bar is crazy bad.....but slowly gets better if the monitor is left on. At approximately 5 minutes, it's gone. The B+ never changes, rock stable. This screams of a cap, but it's not. I'm at a loss....anyone ever seen this issue? Thanks!
Edward
Edward
