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It did work last time I tested it but I can test again with my Plus

@Swabbie I'll sell you a beige mouse for $30

Just remove the back case and front bezel and scrub with soap and water... If it chimes that's good. If the screen stays black or flickers that's because of a cracked solder joint on the analog board. https://archive.org/details/mac_The_Dead_Mac_Scrolls_1992/page/42/mode/2up Those mains cords...

@Cory5412 On the suggestion of others, please rename this thread to "Honey, I shrunk the MicroMac Performer" to make it more easily findable in searches. Thanks. I did ding up my first assembled Polyphloisboisterous '030 by trying to desolder the headers so I decided to build another one. The...

Go on over to TinkleDifferent then

I don't think the internal Quantum HDDs can spin down... But if it's a Quantum it's certainly got stuck heads due to melted rubber bumpers inside. Turns to goo after a long time :(

LOL! I soldered the wrong side of the headers to the card.

I think that the round machined pin headers are too large in diameter. I'll try to desolder them and replace them with buss wires.

My GALs are also 15ns. I just tested the upgrade card in my Macintosh Plus and it does work. The only problem is that it's very hard to mount on top of the 68000, I can't even push it in all the way. There's a lot of resistance. I soldered a machined pin socket on top of the 68000, and machined...

Yes. I fixed the Afterburner, it was a problem with the on/off switch. I bought the wrong type of switch from DigiKey so I substituted another harvested from an old fax modem but it didn't function exactly as expected. The switch was connecting VPP to the wrong pad so I soldered a bodge wire and...

Twist the code into pretzels so it'll crash an emulator but not real hardware

Upgrade almost fully assembled... I didn't buy a PGA-128 socket for the 68030, instead I used several machined pin headers. Just waiting on GALs because I also built a GAL programmer for Arduino, but it doesn't identify any GALs inserted and I don't know why.

PAL is a programmable logic chip, if someone got a hold of this particular Donoho PAL they could read out or reverse engineer the logic it was programmed with and write that to new PALs or GALs. But I guess the person who owns this special IIfx logic board is a total douchecanoe for not donating...

They say Y, replace with Y2

Book says replace with at least 35V rating. The ones you picked will do the job

CR1 is in the flyback circuit, so mains voltage doesn't matter. The book says 3A diodes were originally used, they should be replaced with at least 5A rated diodes.

Yes. Actually the diodes aren't mentioned in "The Dead Mac Scrolls" but rather the earlier "Macintosh Repair & Upgrade Secrets" https://archive.org/details/mac_Macintosh_Repair_Upgrade_Secrets_1990/page/n145/mode/2up

Blackened leg on diode looks bad. See "Dead Mac Scrolls" about replacing it

PCBs have arrived. I made a few small changes since the last time I showed the design. JLCPCB made five of these for $2.07 and shipped to USA for $9.19

Then you've still got cold solder joints or a loose connection somewhere. Look again...