So, we're having this weird issue with a QNIC CGM-2500 monitor in a Neo Geo. Whenever a game has a flash in it, like during duper moves in fighters or big explosions in shmups or what have you, the monitor will desync for a split second and then recover.
Here's a video I took of the KoF 2001 intro, you can see it do this about six times:
https://youtu.be/J2j0QlXB8ME (audio is kind of loud, but unnecessary so you can turn it off)
The monitor has had a cap kit not too long ago. This seemed like it was potentially a flyback problem, so the flyback has been replaced. I kind of remember it being worse before the flyback replacement, so that may have helped a little, but it's been a while and I've had to work on so much stuff since then I can't be 100% sure on this.
I found the manual for the monitor and it has a flowchart that says that IC701 controls horizontal and vertical osc, so I replaced that. No effect there either. The Sync interface is IC401 and I believe I replaced that as well to no effect. I can double check on that tomorrow.
We had this issue with a K7000 too and I couldn't pin it down there either. Has anybody encountered this problem before and had any luck fixing it with something not related to the parts I've already gone through?
Here's a video I took of the KoF 2001 intro, you can see it do this about six times:
https://youtu.be/J2j0QlXB8ME (audio is kind of loud, but unnecessary so you can turn it off)
The monitor has had a cap kit not too long ago. This seemed like it was potentially a flyback problem, so the flyback has been replaced. I kind of remember it being worse before the flyback replacement, so that may have helped a little, but it's been a while and I've had to work on so much stuff since then I can't be 100% sure on this.
I found the manual for the monitor and it has a flowchart that says that IC701 controls horizontal and vertical osc, so I replaced that. No effect there either. The Sync interface is IC401 and I believe I replaced that as well to no effect. I can double check on that tomorrow.
We had this issue with a K7000 too and I couldn't pin it down there either. Has anybody encountered this problem before and had any luck fixing it with something not related to the parts I've already gone through?
