Hey guys
I'm having a video issue with a macintosh SE logic board that I just bought off craigstlist. It came with a set of low density roms which I used to get another mac SE board working, and I now have a fully working mac SE setup but I can't seem to get the second board working. The board was supposed to be good but I got into this knowing I would have to learn to fix these issues if I want to keep some 68k macs alive for a while.
I don't think it's the classic simasimac issue.
Either way I figured I would start by clipping out the battery and replacing the capacitors. Video came out the same. I then washed the board thoroughly in a bath of water/soap and then isopropyl alcohol, video still came out the same. All the roms have been cleaned and reseated.
I know the rest of the machine works without any video issues and I'm using RAM that I know is good. Doesn't seem to be any broken traces or corrosion anywhere.
I'm a bit stumped at this point, having some trouble finding a way to diagnose issues with the SE specifically rather than the SE/30... Just wondering if anybody could point me in the right direction.
I've got a screenshot of what it looks like initially. The white bands are only visible in the picture and not on the actual unit, and it's hard to see in the picture but under the bottom-most white band, 1/4th of the screen has a slightly different repeating pattern. The picture changes in stages, about every 5 seconds or so the region at the bottom expands upwards about an inch and the pattern changes slightly. It looks as if a pixel or two in each character of the pattern changes from black to white or white to black. After about 20 seconds it stops changing with the top 1/4th of the screen being a slightly different pattern than the bottom 3/4th.
Has anybody run into this issue before?
Thanks
I'm having a video issue with a macintosh SE logic board that I just bought off craigstlist. It came with a set of low density roms which I used to get another mac SE board working, and I now have a fully working mac SE setup but I can't seem to get the second board working. The board was supposed to be good but I got into this knowing I would have to learn to fix these issues if I want to keep some 68k macs alive for a while.
I don't think it's the classic simasimac issue.
Either way I figured I would start by clipping out the battery and replacing the capacitors. Video came out the same. I then washed the board thoroughly in a bath of water/soap and then isopropyl alcohol, video still came out the same. All the roms have been cleaned and reseated.
I know the rest of the machine works without any video issues and I'm using RAM that I know is good. Doesn't seem to be any broken traces or corrosion anywhere.
I'm a bit stumped at this point, having some trouble finding a way to diagnose issues with the SE specifically rather than the SE/30... Just wondering if anybody could point me in the right direction.
I've got a screenshot of what it looks like initially. The white bands are only visible in the picture and not on the actual unit, and it's hard to see in the picture but under the bottom-most white band, 1/4th of the screen has a slightly different repeating pattern. The picture changes in stages, about every 5 seconds or so the region at the bottom expands upwards about an inch and the pattern changes slightly. It looks as if a pixel or two in each character of the pattern changes from black to white or white to black. After about 20 seconds it stops changing with the top 1/4th of the screen being a slightly different pattern than the bottom 3/4th.
Has anybody run into this issue before?
Thanks
