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So, I've reflowed all the solder joints on the connectors and looked over both the analogue and logic boards closely, but no dice. I'm not sure if this helps with diagnosis, but I noticed the following: The machine will run for a while from cold. Formatting a floppy repeatedly will eventually...

Ok, I’m getting really weird readings from the floppy connector with the machine in its not-booting state. Struggling to get anything from the 5, 12 or -12 lines. When I do get something stable, it’s 2 or 3V on any of those three. That’s against the GND lines on the socket as well as with...

Ah yes! Will grab a pin out and give it a test. Thanks!

Thanks, PotatoFi! Just curious, do you know some good points to test the +5, +12 and -12V voltages at on a running system?

Bit more info: after leaving it for a few hours, it started fine! Ran well for about 10 minutes, even managed to format a floppy to test my FDD refurb job. Finder showed the full 4,096K…but then it froze. And it’s back to showing the pattern in the photos and won’t boot again. I’m still sorta...

Hi! I picked up my first compact Mac - an SE SuperDrive with 1MB RAM. It booted fine, but the display brightness was unstable (dimmed in unison with hard drive access) and the horizontal screen size would jump by 5mm or so every now and then. So I ordered cap kits from Console5 for the PSU and...