Got a MacBook Pro 15" A1990 with a board issue, The board turns on, I did a DFU revive to see if it needed a firmware patch, that was successful, however the board just keeps boot looping and turning off and on very quickly. Obviously the DATA Is there, but it wont even launch into recovery, it will just die and turn back on with Apple logo, once it gets really hot it dies, if the laptop sits for the day and is cool, it will turn on then get hot within 1 min then die and turn itself on and repeat. Once it does that it turns itself on and off repeatedly in seconds. I put a thermal camera on the board to see if any chips are getting really hot. I noticed that UA600 chip gets really hot and hits about 130 degrees. This seems a little steep. I see that is a POWER CONTROLLER IC Chip so im assuming possibly this could be the issue but there are a few other power chips getting hot as well. Any suggestions would be great. Thanks in advance.
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mb code:820-01827-A;
sn:C02Z349ALVDR;
i9 32GB Ram 1TB
Hi, I found short on one of 6 black nand (total 1TB).
i removed all 6 nand ( voltages all ok) and now i want to program with JC P15 but for A1990 2019 there is only 512GB configuration.
I try A2141 1TB configurazion with TSB4228 but the position on pcb is different ( U9300 and U9400 is no stuff on A1990 but present on A2141 and U8800 and U8900 is no stuff on A2141 but present on A1990 )
macbook with A2141 configuration run on recovery but don't complete it.
anyone can help me?05-26-2025, 09:27 AM -
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... -
Hello,
I am currently working on a Macbook Pro A1990 (motherboard 820-01041) which is not charging.
The Macbook consumes 5V and 0.019A at USB-C. There seems to be a partial short-circuit on the PPBUS_G3H rail as I have 0V on this rail.
I've physically separated (by removing F7000 and F7001) PPBUS_G3H and the ISL9240 charging chip to see which side the short is coming from. Removing these fuses gives me 12.6V at the output of the ISL chip (PPVBAT_G3H_CHGR_REG).
However, I can't work out exactly why I don't have the PPBUS_G3H rail.
Here are the values... -
I have a a1990 2018 15 inch MacBook Pro that will not power on.
I have replaced the pch bga chip because it was heating up under my thermal camera.
I have replaced the battery, and replaced the small ic between the gpu and cpu as it had a direct short to ground.
the MacBook now pulls 20v 2.4amps the trackpad clicks but it does not ever attempt to power on not even fan spin. After PCH replacement I was able to get it in dfu mode 1 time and restore bridge OS, but now the MacBook will no longer go into DFU mode.
I have also noticed L7030 gets extremely hot yet... -
Hey everyone,
I bought a MacBook A1990 with no screen. I bought it knowing the motherboard was defective but wasn't sure what the problem was until I received it. It actually turns on but as you see from the attachment, it has vertical stripes, on an external screen!!
The board is neat. Not opened before for sure. Just a little dust, nothing more.
Recovery using wifi can be opened, as can also be seen in the photo but it doesn't go all the way through after connecting it to a wifi. It downloads the initial Recovery files but never completes the rest of the...