Using the built-in "test mode" to troubleshoot a dead Mac SE/30

In my last SE/30 repair video, I was totally stuck with what to do next because the machine crashed as soon as I turned it on. That led me on a path to discover the internal ROM based Macintosh diagnostics which we can leverage to figure out what exactly is wrong with these broken SE/30 motherboards!

Part 0: https://www.youtube.com/watch?v=Mf8zdOXndwY Part 1: https://youtu.be/v8KXPXT4E1U Part 2: This part! Part 3: Coming soon

-- Links

Using internal Mac diagnostic modes: https://docs.google.com/spreadsheets/d/1zsc7ET5fyiOYWj1_AzOgafbrCVFED-7jzLH6ruCiAVE

Original document on the Diagnostic protocol: https://web.archive.org/web/20210516085835/https://mac68k.info/wiki/display/mac68k/Diagnostic+Mode

Replicated Schematics of the SE/30: https://github.com/mishimasensei/macse30mlb/tree/master/hardware/pcb/mlb/output

Mac SE and SE/30 PicoATX PSU adapter: https://github.com/dekuNukem/PicoRC https://www.tindie.com/products/dekunukem/picopsu-adaptor-for-macintosh-se-se30/

RGB2HDMI: https://github.com/IanSB/RGBtoHDMI

TechStep Photos: https://appletothecore.me/files/1991_techstep.php

TechStep Replica: https://ko-fi.com/s/aa01c62182

Adrian's Digital Basement Merch store: https://my-store-c82bd2-2.creator-spring.com/

Adrian's Digital Basement ][ (Second Channel) https://www.youtube.com/channel/UCbtwi4wK1YXd9AyV_4UcE6g

Support the channel on Patreon: https://www.patreon.com/adriansdigitalbasement

My GitHub repository: https://github.com/misterblack1?tab=repositories

-- Tools

Deoxit D5: https://amzn.to/2VvOKy1 http://store.caig.com/s.nl/it.A/id.1602/.f

O-Ring Pick Set: (I use these to lift chips off boards) https://amzn.to/3a9x54J

Elenco Electronics LP-560 Logic Probe: https://amzn.to/2VrT5lW

Hakko FR301 Desoldering Iron: https://amzn.to/2ye6xC0

Rigol DS1054Z Four Channel Oscilloscope: https://www.rigolna.com/products/digital-oscilloscopes/1000z/

Head Worn Magnifying Goggles / Dual Lens Flip-In Head Magnifier: https://amzn.to/3adRbuy

TL866II Plus Chip Tester and EPROM Programmer: (The MiniPro) https://amzn.to/2wG4tlP https://www.aliexpress.com/item/33000308958.html

TS100 Soldering Iron: https://amzn.to/2K36dJ5 https://www.ebay.com/itm/TS100-65W-MINI-Digital-OLED-Programmable-Soldering-Iron-Anti-static-Structure/113382669853

EEVBlog 121GW Multimeter: https://www.eevblog.com/product/121gw/

DSLogic Basic Logic Analyzer: https://amzn.to/2RDSDQw https://www.ebay.com/itm/USB-Logic-DSLogic-Basic-Analyzer-16Ch-100MHz-4Ch-400MHz-Xilinx-Spartan-6-FPGA/202543965672

Magnetic Screw Holder: https://amzn.to/3b8LOhG https://www.harborfreight.com/4-inch-magnetic-parts-tray-90566.html

Universal ZIP sockets: (clones, used on my ZIF-64 test machine) https://www.ebay.com/itm/14-16-18-20-24-28-32-40-pin-IC-Test-Universal-ZIF-Socket-Fs/303206721971

RetroTink 2X Upconverter: (to hook up something like a C64 to HDMI) http://www.retrotink.com/

Plato (Clone) Side Cutters: (Order Five) https://www.ebay.com/itm/1-2-5-10PCS-Micro-Scissor-125mm-PLATO-170-Electronics-Cutter-Side-Cutting-Pliers/163458746184

Heat Sinks: https://www.aliexpress.com/item/32537183709.html

Little squeezy bottles: (available elsewhere too) https://amzn.to/3b8LOOI

--- Instructional videos

My video on chip removal without damage: https://www.youtube.com/watch?v=XQVjwPsVFd8

--- Music

Intro music and other tracks by: Nathan Divino @itsnathandivino ... https://www.youtube.com/watch?v=W1biFIdQZDw