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Was able to find the part number--820-01124 (923-02823). Just in case it may help anyone else. Found them at "thebookyard.com", but they're out of stock currently. Found in stock at macrecycling.com.

I'm in need of a few of the small I/O boards for the new 2018 Air models. Can't find a part number (don't have any available to check), and can't find any on the typical venues. If anyone could even just provide the part number (820/821-XXXXX), that would be helpful as well! Very much...

Why are you wanting to do this? 3332 boards are repairable, and 3662/3787 boards aren't typically GPU issues. Just curious why you would do it?

Yup, very likely dead CPU.

Check for shorts across all rails. If no shorts, this one may not be good news. CPUs dropping like flies on these things.

00165 boards much more picky with BIOS. Did you even try to perform a clean install of High Sierra when you had a working (bootable) BIOS?? Installing High Sierra will correct ME region automatically, as long as unit will boot to installer.

Perform clean install of OSX using that exact board/drive and try again (or force update via bless/mount). Sounds like you still have ME region issues.

Never seen a MUX do that. If it really has been worked on that much, you can't rule out damage to the board itself. Of course, GPU highly suspect, as it damage near/around it...inspect entire board very well for missing/damaged components.

I was able to confirm the cable was in fact iSight. iSight will never work again on this unit/assembly, but at least the display works!

Working on a 2018 Air Retina with liquid-damage. Was able to miraculously repair the board without schematics by matching circuits, etc., but ran into one issue I won't be able to resolve. One of the smaller cables/connectors coming from the LCD assembly has been burned beyond repair. The pins...

Oh my goodness--yes, ALWAYS remove heatsink when working on any board, unless you're doing something super minor on edge of board, etc. I have repaired around 20 of these CPU vcore drop-out issue boards. Of the 20, ~10 were 3662, ~5 were 3787 and ~5 were 00138/00163/00426. I have noticed that...

Yup, pretty common fault on these...would be a bitch to fix. If it was liquid, hopes are a bit higher. If it was random or a drop, this will be a nightmare.

Have you confirmed the board doesn't have any cracks/breaks? Specifically along I/O side...USB ports commonly cracked at the board. There are many lines running along right-side edge of board, so any damage there can cause funky issues relating to power/charge/etc. Just a thought...this thread...

Make sure you used a C00 CD3215 and not B03; check chip face. Made the same error a few times (the B03's are easier to pull from the 00840/75 boards), but the 00923/239/etc need C00.

OK, I guess they just added it to internet AHT. I've booted 3 more 2015 models the past day or two and they all now have it. Pretty convenient, I guess. Disregard! :D

Was running AHT on a 2015 board today, and noticed something I'd never seen before; the unit's serial number was shown permanently (the entire time after booting to option+D) in the bottom-left hand of the screen, along with a barcode. I've never seen this before and hope I'm not crazy, but just...

2informaticos Quick question regarding Medusa; can it repair/clean a BIOS properly if it's not the original to the board? In other words, this OP says board came in with BIOS already replaced, so the BIOS original to the board is lost/unavailable. In my experience with boards that have no...

Thank you!! I actually realized I had replaced the CD3215 with a "B03" version instead of "C00". Once I replaced it with a C00 chip, the board began working--no more cycling, etc. It boots and has passed AHT, and seems to be working well! :) Thanks again!

Working on a board that had liquid to some areas I'm not thrilled about, but it is what it is! Obvious liquid to U7800, U7900, U4200 and U3100 (awesome, great, very excited). Board running on 5.14v that cycles every ~8 seconds or so, EXCEPT if I connect charger to the bottom right-side port, in...

Bad bottom RAM slot. You can repair damaged pins, or just utilize the top slot. Common issue on the 820-3115 boards.