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| Macintosh SE/30 screen "shimmering" issue |
Posted by: Will Cheyney on 2020-06-30 05:41:34
Hi all. Looking for some technical advice from you all.
I have a Macintosh SE/30 that has a very minor issue with the display. It appears that when the machine is seeking data from the HD, a very faint horizontal shimmering line effect moves up and down the screen. So faint that I can't even record it to show you. There is no "worming", distortion or burn in on the display otherwise.
I doubt the majority of people would even notice it but I'm curious as to whether anyone knows what a potential issue may be.
The logic board has been recapped and I'm planning on doing the Sony PSU tomorrow incase it's a voltage regulation thing (testing the voltage on the floppy port shows small fluctuations).
Any ideas? Thanks!
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Posted by: blusnowkitty on 2020-06-30 06:08:35
If I had to guess - and it is just a guess - it's probably magnetic interference from the hard drive. I've got an IBM PS/2 Model 25, IBM's answer to the Macintosh all-in-one PC, and the hard drive in that thing does create a very slight wobble on the screen. If I unplug power to the drive, it goes away completely.
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Posted by: Will Cheyney on 2020-06-30 06:38:56
Thanks @blusnowkitty. No luck though. I've tried disconnecting the HDD power and booting from a Floppy EMU and the issue is still present.
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Posted by: jessenator on 2020-06-30 06:47:57
The logic board has been recapped and I'm planning on doing the Sony PSU tomorrow incase it's a voltage regulation thing (testing the voltage on the floppy port shows small fluctuations). I would also look into re-capping the analog board. I had a very similar issue to what you're describing in my own SE/30. Re-caps across the board solved that little irritation for me.
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Posted by: Will Cheyney on 2020-06-30 06:50:57
I would also look into re-capping the analog board. I had a very similar issue to what you're describing in my own SE/30. Re-caps across the board solved that little irritation for me. Fab, good to know @jessenator!
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