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Try again, amended the permissions.

Take a look at the MLCC under the word 'SINGAPORE' - cracked/dry solder on those fillets. I'd add a dab of flux and reflow each side, to be sure.

These are also available in the resource section, above.

Ah - remember, the ground shield on these models also acts as a ground between different points on the logic board - IIRC Adrians Digital Basement also encountered the same issue as this, make sure the contact between the board and the ground shield is good.

It's a rectifier - Vishay still make these: https://www.mouser.co.uk/ProductDetail/Vishay-Semiconductors/BYV28-200-TAP?qs=yIvl1B2wDi7mFBLogVTbRA%3D%3D

Yeah i had a look there, but lots of questions, no answers.

So this was about to be yeeted into the e-waste at work when one of my colleagues stopped it from going in the bin, putting it on my desk instead. I love these little USFF 1L machines, they pack so much into such a tight space, and this appeared to be no different. Opening it up, oh, a...

Here you go, this should fit just fine: TE 5749181-1

It should be the same part number as the one on the Macintosh SE Reloaded BOM, lemme grab that after Christmas dinner...

Happy Grav-mass!

If you wanna get rid of that 660AV and an auto inject pizza box case & drive *ahem* :D

Just curious, what's the board revision printed on the PCB?

Might be worth uploading these to the resource section here.

@DosFox may be the person you're looking for, AFAIK

@techknight has been recently restoring something similar, I'll ping him on the discord.

Sand the board down until you get to the middle layers on both sides. then mark, or scan.

The BBU is an ASIC - it is non programmable, it is fixed function, not FPGA or CPLD.

We used these:

Reminds me of the power supplies we had in the electronics lab at school, big, orange, with a chunky metal insulated bus bar like loopbto select the voltage on it. Also used banana plugs.

They're pin compatible parts.