Hi, first post, glad to be here.
I have a new-to-me Mac Plus. It appears to be an earlier Mac that was upgraded. It has the Samsung CRT and the "early" flyback transformer without yellow(brown) glue on it. It has a 4MB RAM upgrade.
The problem with the CRT is that some horizontal rows will randomly be offset by 1-2 pixels to the right or left. The attached image shows a single frame of the symptom. In operation, different rows exhibit this problem per frame randomly, and the number of affected rows randomly increases and decreases. It gives kind of a "sizzling" visual effect.
Inside the unit, something is making a faint sizzling/arcing/popcorn sound but I can't pinpoint what it is. Seems more like the CRT neck than the flyback but can't really tell.
I recapped the analog board yesterday, and re-re-touched up all the solder joints, and that didn't make things better or worse.
I also did the diode power mod to the SCSI port on the mainboard, which had no impact on this issue before or after (which it shouldn't have, but mentioning it just in case).
Other than this CRT issue, the computer seems 100%; it was well-cared for in its lifetime, not especially dirty/dusty, hardly yellowed. Works fine with a BlueSCSI to run various programs.
Thoughts?
Thanks!
I have a new-to-me Mac Plus. It appears to be an earlier Mac that was upgraded. It has the Samsung CRT and the "early" flyback transformer without yellow(brown) glue on it. It has a 4MB RAM upgrade.
The problem with the CRT is that some horizontal rows will randomly be offset by 1-2 pixels to the right or left. The attached image shows a single frame of the symptom. In operation, different rows exhibit this problem per frame randomly, and the number of affected rows randomly increases and decreases. It gives kind of a "sizzling" visual effect.
Inside the unit, something is making a faint sizzling/arcing/popcorn sound but I can't pinpoint what it is. Seems more like the CRT neck than the flyback but can't really tell.
I recapped the analog board yesterday, and re-re-touched up all the solder joints, and that didn't make things better or worse.
I also did the diode power mod to the SCSI port on the mainboard, which had no impact on this issue before or after (which it shouldn't have, but mentioning it just in case).
Other than this CRT issue, the computer seems 100%; it was well-cared for in its lifetime, not especially dirty/dusty, hardly yellowed. Works fine with a BlueSCSI to run various programs.
Thoughts?
Thanks!