Your contributions are much appreciated!! Thank you!
I think laying it all out like that is great..
Just thought of a few points worth mentioning in the video:
As far as non-booting in particular:
1 - The driver board does not have to be attached to run tests 01a through 05-displays.
2 - Disconnecting the driver board may help the boot succeed, If so the problem is on the driver board.
3 - Not all chips are suspect on a non-booting board - only the chips that are actually tied directly to the address and/or data bus. so assuming the CPU chip is okay, then RAM, 5101/CMOS, PIA's, transcievers, and even the other stock ROMs could be the culprit. Determining which one is the really fun part
4 - You can remove all ROM and RAM chips, including the 5101 if needed to run the 01a-leds test. Also applies to 01b-bus and 01c-transceivers.
5 - Having adequate +5V and +12V is imperative on the MPU and the driver board if connected. Reset circuit must also be functioning properly (aka reset pin on CPU chip starts out LOW and goes HIGH after half a second or so).
6 - Batteries do not need to be installed.
7 - Illustrate where the tip of the logic probe should be connected, If the board in question does not have LEDs installed. Of course, also show where to connect the black and red alligator clips of the probe to the MPU board. On a system 6, TP9 is red, TP10 is black.
8 - Testing a non-booting game for all system boards 3-6a are generally the same. System 7 just has the segment display for results (with the funky characters for PASS/FAIL).
9 - Jumper settings on the MPU board need to be verified. In addition, If their MPU board has been upgraded (say from a 6 to a 7, etc) the selected group of Adapter tests should be chosen based on the board revision it is "emulating". So if a system 7 board is installed (and jumpered correctly) in a system 6 game, the Pincoder sys346 group of tests should be used for troubleshooting.
It should also be noted that if the driver board is connected at the 40 pin, and for some reason the rest of the driverboard connections are to be removed, (aka on the bench) 2J8 (Logic power bus input) should remain connected. One must also be sure (at this point) that the 40 pin be in working condition. I usually use a magnifying glass and a flashlight to inspect the condition of each pin and its connection while the driver board is connected - at least to start with.
As far as fuses go.. some games of course immediately lock on one or more solenoids when the williams roms are booted. this SHOULD NOT be the case when running 01a-leds through 09-lamps as those tests disable the solenoids and flippers by setting the PIAs to a particular configuration. So it should be safe to leave all fuses in. However, if they still lock on while running those tests then there is an issue with driverboard circuitry that is AFTER the PIA, or perhaps improper connections under the playfield. In this case the corresponding fuses can be removed to allow troubleshooting to continue.
I'm sure you have other points you want to add, and that's the beauty of having other people involved
Thank you again for putting this together!
ps: I think it would be best to have all of the videos in one youtube account/channel, so that we dont have end up with a million links to give out. Cheddar if you want to maintain that channel, that's cool with me, but if you'd rather not I can create one and we can move things there