This repair put my logical reasoning to the test

#apple #macintosh On today’s video, I’m going outside my comfort zone and working on analog stuff. It’s a very broken Macintosh 128/512/Plus power supply/analog board. It was sent in by Tommy of the YouTube channel Arctic Retro as a broken part. He didn’t know what was wrong with it other than the machine wouldn’t power on. So let’s find the faults with this board and get it working again! --- Video Links Tommy’s channel Arctic Retro: Thread on replacing the variable potentiometer with a modern part: (Thanks to patron Flying Toaster) Adrian’s Digital Basement Merch store: Adrian’s Digital Basement ][ (Second Channel) Support the channel on Patreon: -- Tools Deoxit D5: O-Ring Pick Set: (I use these to lift chips off boards) Elenco Electronics LP-560 Logic Probe: Hakko FR301 Desoldering Iron: Rigol DS1054Z Four Channel Oscilloscope: Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier: TL866II Plus Chip Tester and EPROM programmer: (The MiniPro) TS100 Soldering Iron: EEVBlog 121GW Multimeter: DSLogic Basic Logic Analyzer: Magnetic Screw Holder: Universal ZIP sockets: (clones, used on my ZIF-64 test machine) RetroTink 2X Upconverter: (to hook up something like a C64 to HDMI) Plato (Clone) Side Cutters: (order five) Heat Sinks: Little squeezy bottles: (available elsewhere too) --- Links My GitHub repository: Commodore Computer Club / Vancouver, WA – Portland, OR – PDX Commodore Users Group --- Instructional videos My video on damage-free chip removal: --- Music Intro music and other tracks by: Nathan Divino @itsnathandivino