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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.

I'm having a hard time finding an affordable/reliable vendor for the LP8550 with the "dot" (D71B?) instead of the "diamond" (D68B?) logo for pin 1, which I assume has programming (compared to the diamond-logo/D68B chip). I bought 100 a year or so ago, and have just run out. All I have left are...

Ahh, yeah, OL isn't great news. .6 is fine, and all data pins should read roughly that. The good news is that they don't all go straight back to the CPU; all of those pins measuring OL could indicate a bad U9150. What does U9150 area look like? I'd reflow, then replace if reflow doesn't help.

Compare diode for all pins to working board; easiest way. See if any are significantly (5-8%+) different in value.

Inspect eDP connector very well; sounds like there may possibly be some slightly bent/damaged pins inside. Also compare diode values for data lines on eDP to working board; I've seen a few of these (drops I believe) that had open data lines (and sadly were not repaired). With these symptoms, you...

Interesting--thanks. I knew RAM, bad CPU (after a few starts) would typically cause shutdown at similar intervals of time, so good to know BIOS/ME can have the same effect. Thanks!