The Apple II and the Mysterious Ticking Noise

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
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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?