Mostly it's the Capacitors that go bad. Adrian's Digital Basement has some videos on resurrecting old 8bit apple computers. here's a good playlist to start. He

Mostly it's the Capacitors that go bad. Adrian's Digital Basement has some videos on resurrecting old 8bit apple computers. here's a good playlist to start. He starts talking about the power supply around the 26 min mark. https://www.youtube.com/watch?v=qTkX7rkq_Kk&list=PL4tFqFVNf5LT6X3sMRfbRWuTVE5NuEmKj&index=8 https://www.youtube.com/watch?v=qTkX7rkq_Kk&list=PL4tFqFVNf5...