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| Macintosh Plus - Wobbly picture, collapsed height |
Posted by: joshc on 2020-09-13 20:49:55
I have a Plus with a recapped logic board and analog board (work carried out by me).
It worked perfectly before I put it into storage.
I've just taken it out of storage, I think I last turned it on a few months ago.
Now the picture is very wobbly and the picture height has collapsed.
Any ideas as to what is causing this behaviour?
I have checked the ground points and everything is still screwed together as it should be...
See videos below
View attachment IMG_0540.mp4
View attachment IMG_0543.mp4
View attachment IMG_0541.mp4
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Posted by: techknight on 2020-09-14 00:20:04
They dont play. just show white screens. Should use a service like google drive, or some other uploader/video embedder.
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Posted by: joshc on 2020-09-14 00:54:17
Sorry, they work in Safari but yes don't seem to work in other browsers for some reason
Looks like mp4 embeds are broken on this site maybe.
@techknight Here you go...
https://streamable.com/9h20fk
https://streamable.com/gpmdc6
https://streamable.com/g04h5i
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Posted by: techknight on 2020-09-14 01:54:48
thats an open capacitor somewhere. your getting 120hz noise into the horizontal deflection.
if you have already recapped this board, you should go back and double-check all of your work. And have you replaced EVERY capacitor? including the main primary input filter capacitor?
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Posted by: joshc on 2020-09-14 03:19:31
That seems very odd because after the recap this worked perfectly, its only after being in storage that its had this weird problem.
I replaced all capacitors yes.
I will check them all again...
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Posted by: joshc on 2020-09-14 04:15:11
Reflowing the solder joints for the capacitors did the trick. Thanks @techknight
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Posted by: techknight on 2020-09-14 04:46:57
Figured. I knew it was an open capacitor somewheres.
At least you got it going 🙂
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