Recent content by Hugotronics

To me UC7 is bad, you'll need to replace it.

If the RAM is bad or missing, the machine will produce the death chime. If there's no chime at all, the issue is more serious — possibly a broken trace or a faulty IC.

This part of the board drives the soft power circuit. Any broken trace is a problem. To test a trace you suspect is cut without following it to the end, you can simply scrape it slightly to expose the copper.

Broken traces around UE13 (HC132), or just a bad chip.https://oldcrap.org/wp-content/uploads/2023/04/apple-iici-schematics-startup-circuit.gif

There are some electrolytic capacitors that you should definitely replace, they're probably leaking.