I've got a Donkey Kong that has the typical left side droop. I keep two PCBs in this cabinet, DK and DK Jr. This just started acting up a few weeks ago.
Importantly, the droop occurs with both my DK and my DK Jr. boards. Adjusting the Vertical pots on the PCBs (i.e. the ones that move the screen left and right) will temporarily fix the problem but as soon as I power down and back up again the problem comes back. I never get a smooth left to right when I adjust the V pot. Instead, the screen repeatedly falls in and out of synch as I turn the pot through its spectrum. I'm getting the EXACT same symptoms on both the DK and DK Jr. PCB. I replaced the pots on the DK Jr. board and this failed to change anything. Based on the above I'm thinking the pots are good and not the problem.
I checked the B+ which was initially a little high at 111v but it adjusted down to 108.2v just fine. This had no visible effect on the problem or the image and the syptoms are still there.
I have also tried adjusting the H-Hold pot in the center of the chasis. This will also temporarily "fix" the droop problem until I power down and power back up. I get a good 10-15 degrees of turn radius where the screen is locked in, other than the droop. Outside of those 10-15 degrees I get a scrambled image like you'd expect when the H-sycnch is off. Also, once I get the droop mostly adjusted out, the very left side of the image still flares up or down just the slightest bit and I can never get the image truely flat/stable.
The monitor was capped in April 2010 and the monitor has been rock solid since that time.
Anybody got any ideas? I'm thinking about replacing the H-Hold pot, however, the pot looks like it's already been replaced in the past. It's got a plastic dial on it, not the crappy flat metal one that would have originally been on the monitor. Otherwise the monitor is great and I'd rather not mindless recap it if I can avoid it.
Importantly, the droop occurs with both my DK and my DK Jr. boards. Adjusting the Vertical pots on the PCBs (i.e. the ones that move the screen left and right) will temporarily fix the problem but as soon as I power down and back up again the problem comes back. I never get a smooth left to right when I adjust the V pot. Instead, the screen repeatedly falls in and out of synch as I turn the pot through its spectrum. I'm getting the EXACT same symptoms on both the DK and DK Jr. PCB. I replaced the pots on the DK Jr. board and this failed to change anything. Based on the above I'm thinking the pots are good and not the problem.
I checked the B+ which was initially a little high at 111v but it adjusted down to 108.2v just fine. This had no visible effect on the problem or the image and the syptoms are still there.
I have also tried adjusting the H-Hold pot in the center of the chasis. This will also temporarily "fix" the droop problem until I power down and power back up. I get a good 10-15 degrees of turn radius where the screen is locked in, other than the droop. Outside of those 10-15 degrees I get a scrambled image like you'd expect when the H-sycnch is off. Also, once I get the droop mostly adjusted out, the very left side of the image still flares up or down just the slightest bit and I can never get the image truely flat/stable.
The monitor was capped in April 2010 and the monitor has been rock solid since that time.
Anybody got any ideas? I'm thinking about replacing the H-Hold pot, however, the pot looks like it's already been replaced in the past. It's got a plastic dial on it, not the crappy flat metal one that would have originally been on the monitor. Otherwise the monitor is great and I'd rather not mindless recap it if I can avoid it.