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Posted by: imactheknife on 2025-04-22 15:20:09
recapped a working 12” apple rgb color monitor. Pretty straightforward. Now i have a small band so i guess vertical collapse? Any idea what and where to check? I wonder is any of my new caps are an issue? |
Posted by: Durosity on 2025-04-22 15:58:02
Have you checked all the adjustment pots to make sure they’re set correctly? |
Posted by: imactheknife on 2025-04-22 16:26:39
Have you checked all the adjustment pots to make sure they’re set correctly? How would one know if set correctly? Will look and see if there is a service manual for this |
Posted by: Durosity on 2025-04-22 17:06:55
Well (and admittedly my knowledge of these things is limited), does adjusting the pots make any difference? I don’t think there’s a setting on them as such that is “correct”, more one that’s correct for the current components that are on the board.. I had a crt I recapped a while ago and when done it was all a bit odd, but some careful adjustments seemed to fix it. Now.. the problem is of course I don’t know if that’s going to have a longer term consequence on the life of the device.. but it was fairly minor adjustments and it’s at least taken it from a dead display to a working display. |
Posted by: imactheknife on 2025-04-22 17:12:17
Well (and admittedly my knowledge of these things is limited), does adjusting the pots make any difference? I don’t think there’s a setting on them as such that is “correct”, more one that’s correct for the current components that are on the board.. I had a crt I recapped a while ago and when done it was all a bit odd, but some careful adjustments seemed to fix it. Now.. the problem is of course I don’t know if that’s going to have a longer term consequence on the life of the device.. but it was fairly minor adjustments and it’s at least taken it from a dead display to a working display. I tried adjustments but no real change. So will let electricity dissipate and wait over night. Will take apart and check my caps, reflow, and see if anything makes a difference. |
Posted by: Durosity on 2025-04-22 17:17:22
Sensible! Make sure there’s no caps backwards. I did that recently with a AppleCD SC and I’m so annoyed with myself over it. The drive worked fine at first after I replaced the now charred cap, but a few days later it died and not yet been able to recover it.. not 100% sure if that’s was related or not but it sure didn’t help. |
Posted by: imactheknife on 2025-04-22 17:22:50
Sensible! Make sure there’s no caps backwards. I did that recently with a AppleCD SC and I’m so annoyed with myself over it. The drive worked fine at first after I replaced the now charred cap, but a few days later it died and not yet been able to recover it.. not 100% sure if that’s was related or not but it sure didn’t help. Yeah one backwards cap shouldnt do anything but with vintage, who knows? This little monitor worked good before so i hoping its easy to fix. All monitors i have done (6) have worked fine. Was hoping to fix that apple vision 17” but has same issues as before. |
Posted by: Durosity on 2025-04-23 01:57:00
one backwards cap shouldnt do anything but with vintage Yeah.. our hobby likes to throw the rules out the window!
as hoping to fix that apple vision 17” Fingers crossed you get it going. I’ve got one that won’t even power on.. hoping to get it going one day! |
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