iz8dwf | The longest Commodore PET 4032 repair ever, pt.1 @iz8dwf | Uploaded December 2021 | Updated October 2024, 2 hours ago.
CBM PET universal board (originally 4016), S/N WG9369.
First part of the complete repair after it was almost completely socketed.

Timeline:
00:00 - Welcome
00:34 - Sockets! They're everywhere!
02:00 - Testing all RAM connections
05:36 - Power on tests
06:18 - All 40 pins IC are bad
08:33 - Half of the ROMs are bad
11:39 - Missing trace to one ROM
13:06 - The first bad 4116
14:41 - A long RAM troubleshooting
15:06 - Bad /RAS
17:40 - Identifying a short circuit
21:33 - More fixes to go.

Second part video:
youtu.be/U0985Padg6c

Related/useful videos:
How to test a remarked 6502:
youtube.com/watch?v=5MccK9MI9qI&t=272s


IZ8DWF's PET RAM/ROM daughterboard:
youtube.com/watch?v=bjyGk5zoDMs

IZ8DWF's dynamic RAM in-circuit tester:
youtube.com/watch?v=xRQRTc4lDlg&t=430s

Music on this video:
Wise - Silent Partner
Natural - Endless Love
Cologne 1983 - Josh Kirsch/Media Right Productions