Hello, so I get on e-Bay an higly water damaged mother board, to replace another one with a dead T2. So I managed to fix the water damged one, after a day of schematic readings and components replacing. But I made a BIG mistake. The computer turned on, with backlight and everything, Apple logo showing but the power button wasn't working, so I unpluged the cable for audio jack and pwrbttn and pluged it in back.... And now it doesn't boot anymore, staying at 20V around 0.039-0.041 Amps. In the T2 power boot sequence the last line to get power is PP2v7_NAND, so the NAND is corectly powers on. But no PP3v3_S5 and don't understand why cause not shorted and I have PP3V3_AWAKE from the T2. Any help please?
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Hi everyone!
I have a 2018 MacBook Pro (with Sequoia OS) that I've been using for years with no problem. I recently received an M2 MacBook Pro so I'm mostly using it and not the 2018 one, but since a friend of mine needs a computer, I thought I could restore my 2018 and give it brand-new-like to my friend.
I tried using the built-in tool to restore the MacBook (Settings > General > Transfer or restore > Delete) but it got stuck when trying to remove the Find Device configuration (it asked me for the password for my old Apple ID -now I use the same account but...06-27-2025, 08:54 AM -
Dear all,
I have a Macbook Air 2020 13” (820-01958) with water marks around U8700, C7665 and U2800 in front of me. The laptop is not turning on but the CPU is getting warm after a while.
I am trying to figure out which component is potentially dead. For that I made the following measurements:
Voltages on T2 chip rails:
PP1v8_SLPS2R = 1.80V
PP1v8_AWAKE = 1.80V
PP1V8_SLPS2R_PMUVDDGPIO = 1.80V
PP1v1_SLPS2R = 1.10V
PP0v8_SLPS2R = 0.80V
PP0v82_SLPDDR = 0.82V
PP3v3_AWAKE = 3.28V
PPVDDCPUSRAM_AWAKE = 0.80V
PP0v9_SLPDDR... -
Hi,
my MacBook Pro 15" 2018 Touch Bar (A1990) doesn't charge anymore. Board# 820-01041-A
I'm not experienced in diagnostics, but I want to try to solve the problem with your help, because every local shop charges around 600€ (650 usd). Which is the value of the whole Macbook.
The Macbook was charging when suddenly the "charging sound" appeared every other second for around 4-5 times.
After that the Macbook was dead. It isn't charging anymore.
The USB-C Port where the charger was plugged is burned. Also The Cable and the... -
MODEL: MacBook Air 2018 A1932 820-01521
Problem: 5.12V / 0.60Amps
History: Unknown but I can see slight liquid spill on IC U8201/74aup1t97gm
Things tried: I've cleaned the liquid area, removed the IC U8201/check pads, good/ chip looks good, put back. Replaced CD3215C x 2 times, so 4 new chips just in case. I've attached photo readings of V/resistance and signals as per logi wiki website. Please advise what I can check next. Schematics available upon request.... -
Hi guys,
I have a MacBook Pro M4 16" A3403 on the table with water damage. I allready found the problem within a bad cap. As far as my researh went, I couldn't find the schematics and boardview for this MacBook model. They seem not to be released now. So my question is if anybody has a working A3403 on the table and could tell me, which specification this capasator has?
I attached a photo of the missing cap. It's on the bottom side of the logicbard.
I am very thankful for your replys.
Thanks in advanced and best regards from Hamburg Germany...
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