The Apple II and the Mysterious Ticking Noise

Video Description

We're having some trouble with the 1979 Apple II, after fixing the keyboard and PSU. Mentioned in this video (some links are affiliate links): - GitHub repository with Apple II project issues: https://github.com/users/geerlingguy/projects/1 - Jonard EX-2 DIP/IC Extraction Tool 24-40 pin: https://amzn.to/4mONQbr - Hakko FR-301 Desoldering Gun: https://amzn.to/4lZTZQI - PicoRC Apple II replacement PSU: https://dekunukem.github.io/PicoRC/ - 80W PicoPSU Power Supply: https://amzn.to/4nli6e4 - 12V 8A DC adapter for PicoPSU: https://amzn.to/4niQUwp - Console5 Recap kit for Apple II PSU (DYNA COMP 606-5001): https://console5.com/store/apple-2-power-supply-cap-kit-dynacomp-606-5001.html Support me on Patreon: https://www.patreon.com/geerlingguy Sponsor me on GitHub: https://github.com/sponsors/geerlingguy Merch: https://www.redshirtjeff.com 2nd Channel: https://www.youtube.com/@GeerlingEngineering 3rd Channel: https://www.youtube.com/@Level2Jeff Contents: 00:00 - We were so close 00:51 - Keyboard repair 02:36 - Desoldering gun makes it easier 03:55 - Final pass on the X key, dreaming of USB 05:22 - Recapping the Power Supply 06:06 - The Mysterious Ticking Noise 07:07 - PicoRC replacement PSU 07:54 - Now it won't boot? 08:47 - Cleaning every chip with DeoxIT 09:58 - Debugging clocks on the oscilloscope 11:32 - Debugging RAM 12:44 - What else can we do?