Hello! I need help, the MacBook could not boot and rebooted! After examination, I found that the small sound board with a 3.5 mm jack was oxidized! I replaced it and the MacBook no longer boots. Consumption with a battery 20v / 0.000A, without a battery 5v / 0.120-0.470A (not stable). The MacBook is not in DFU!
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Hi everyone,
I'm working on a MacBook Air 2020 (A2337, board 820-02016) and running into a strange USB-C issue. I've gone through quite a bit of testing and part replacement, but I'm stuck — hoping someone here can shed some light.
🛠 Original Issue
The machine initially wouldn't negotiate 20V over USB-C — stuck at 5V.
Diagnosis showed PP1V5_UPC0_LDO_CORE shorted to ground.
I replaced U3100 (UF400) using a donor board (A2179), and the machine powers on fine now.
⚠️ New Problem: One USB-C Port Only Works in One Orientation... -
Hello everyone,
About me, my goal and the equipment I (don't) have:
I am brand new to this forum, and I am eager to learn about repairing laptops. I have an engineer background although I haven't done electronics for a while. I have watched several Youtube videos in the last two months, trying to understand how to diagnose a faulty motherboard. I have a USB-C Amp meter and a classic multi meter. No DC Power Supply to inject voltage, no soldering iron to replace components.
About my issue and my goal:
A friend of mine has a MacBook Air M1 A2337 that does not... -
Hey! As the title says. i don't know if this is the right place to ask but i need to get trusted USB C Controllers (CD3217-CD3215) For macs and dont know where to get them. i dont know if you guys know where is a good place to get it.
The thing is that i have a Macbook air A2337 M1 and i dont have a donnor board to get the CD3217. So i try the CD3217 from a A2141 Board and at first, whitout his eprom it does not convert 5v to 20v. then i put the original CD3217 eprom from the A2141 and then the macbook A2337 conver the 5v to 20v but still not turning on. i guess that the CD3217 is...09-06-2024, 12:06 PM -
Hello all,
I am repairing a Macbook A2337 and i have a problem
The Macbook is stuck in restore as someone before me tried a DFU restore and bricked the device, now i can't do a restore as AC2 throws error 1 which is related to the trackpad.
When i turn on the device i get the trackpad click for a few moments and then nothing, i tried 7 trackpads and 7 trackpad flats, i know all 7 are functioning okay, especially one as i use it for testing and DFU restore.
I inspected the whole board and everything seems fine.
Can anyone help me as i didn't fiddle with trackpad... -
Hey,
I'm working on a MacBook Air M1. I'm pretty sure the U8100 is not working correctly. But I never had to change it before, so I wanna ask anyone of you guys to confirm (or not confirm) my thoughts on it.
USB Tester: 5V / 0,00A
PPBUS_AON: 12,3 V
PP5v_S2: 0 V no short
PP3v3_S2_UPC: 0 V no short
PP1v25_S2: 0 V no short
PPDCIN_AON_CHGR_R: 5 V
no enable signals for the S2 rails by the U8100
both CR3217 (UF400, UF500), are supplied by 5V (Fuses FF200 and FF201)
PP3v3_UPC0_LDO: 0 V, 0,5V diode mode to gnd
PP1v5_UPC0_LDO_CORE:...
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