-
For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.Subscribe Now
A2337 boot-looping
- Thread starter Soji
- Start date
Disconnect internal LCD and test with external monitor.
Very likely the owner worked on the machine without disconnecting the battery.
Machine restarts w/ and w/o battery too?
Try starting in SMC bypass mode.
Machine restarts w/ and w/o battery too?
Try starting in SMC bypass mode.
Soji
Member
It’s still recycling with and without battery
Smc bypass to is not going through. When it reached that time it bootloops , no matter the task it will turn off
am thinking it’s a power thing, the power recycles
there is a big coil next to speaker
connector 2r7 written on it. The 12.3 sometimes 13.2V goes to 00.00V when it loops
I don’t have the schematic yet. Pls can you give a link to buy.
Smc bypass to is not going through. When it reached that time it bootloops , no matter the task it will turn off
am thinking it’s a power thing, the power recycles
there is a big coil next to speaker
connector 2r7 written on it. The 12.3 sometimes 13.2V goes to 00.00V when it loops
I don’t have the schematic yet. Pls can you give a link to buy.
Attachments
Last edited:
gir489
New member
Alright shot in the dark here. How old is the SSD? Have you tried swapping the drive out with another one? You might be chasing a phantom here. I would try a second boot device before trying all this extra rework.
If removing the bad part didn't fix it, and it still does the same thing, I'm betting it's the SSD. Just remember kids, correlation is NOT causation!
If removing the bad part didn't fix it, and it still does the same thing, I'm betting it's the SSD. Just remember kids, correlation is NOT causation!
L5230 is not the point where to check PPBUS_G3H.
Check at F5200, w/ and w/o battery battery connected.
If is not stable, you must check for short on all big coils.
drive.google.com
Check at F5200, w/ and w/o battery battery connected.
If is not stable, you must check for short on all big coils.
02016 X1757 Rev_4.0.0_.pdf
drive.google.com
gir489
New member
Yeah this is exactly why I stayed away from the A1 laptops. I bought a 2020 MacBook Pro used for $700 with the bottom bezel on the screen broken that I'm going to fix eventually but for now works all because it has cosmetic damage. And yes, I think it's one of the NAND chips or the A1 processor. Get Mac OS installed on a USB boot drive, or Linux (I recommend Mint Linux) and see if you can boot. Chances are you can't because nobody else supports the A1 chip like Apple wants, and they're trying to reclaim the Mac market share again by kicking Intel to the curb when they're done with them (again) but people like us remember. So you're either going to have to diagnose a chip fault, boot failure, RAM failure, or any other number of possible failures.
MY BET! If it's the A1, they've locked out the security enclave and detected you swapped the screen. Now it's trying to lock you out for not being Apple certified repair. But that's just my guess from working on the days of when we swapped the fucking thumb button and it would stop reading finger prints and give you errors. Same shit different day.
You can't do anything until get stable PPBUS_G3H.
And this fluctuation is not LCD related; as can be checked without LCD too.
And this fluctuation is not LCD related; as can be checked without LCD too.
Check for knocked of components, broken traces.
The problem was induced by owner; when changed the LCD assembly.
Something changes if try disconnecting internal LCD?
The problem was induced by owner; when changed the LCD assembly.
Something changes if try disconnecting internal LCD?