Customer came in with a board issue, board looks clean, board turns on, he did a software update and he got the infamous Apple boot loop logo. He took it to Apple and Apple said he needed a new board. They attempted to DFU revive restore etc no luck. The board is stuck on the (!) point. I tried DFU myself and no luck. Nothing, board boots up goes into DFU computer turns on with Apple logo when applying the patch and nothing it gets stuck at halfway point and hangs on. I was wondering if anyone has had any experience with this particular issue. Board isn't liquid damage from what I can tell and the board does turn on. Any ideas?
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MEOWING IN THE IMPOSSIBLE UNIVERSE! -
Update: Found the issue. Put a thermal camera on and the Touch Bar connectors were in the 100+ range. Disconnected them and did a DFU revive and success. Bad TouchBar will not let you DFU revive or restore.sigpic
MEOWING IN THE IMPOSSIBLE UNIVERSE! -
Yes replaced the Touch Bar problem was solved.sigpic
MEOWING IN THE IMPOSSIBLE UNIVERSE!Comment
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A2338 - Pristine condition.. I took out of the board and inspected it.. nothing.. as if the computer is barely used even.
Anyway, customer said they tried erasing/formatting it and it got stuck on Apple logo preventing to go further.. I asked them why they tried to erase it from the first place? They said it turned off randomly once.. then they erased it and it worked out for a few days then it shut off again..
I put the computer in DFU; I downloaded the latest Ventura IPSW and restored it.. during the "Installing.." it restarts then it shows the exclamation...09-11-2023, 08:43 AM -
Hi,
I am trying to fix this liquid damaged 2020 Macbook pro and I noticed something weird.
When I push on/around the renesas 501cr0b IC, which appears to be a clock generator/ multiplier, If I apply lot of pressure, the device will reach 19.9 volts and seems to be trying to work.
I have thoroughly reflowed that area and completely removed that chip (there was some liquid stain in that area) but no help. I have just 5v 0a unless I apply the pressure.
Your help is GREATLY appreciated. Thanks! -
Hi. I need some help troubleshooting the issue (which is a bit odd to my limited experience) with the A2338 Macbook.
Initial symptoms:
One day the laptop refused to wake up (as it seemed at first), spinning the fan on full blast, with no picture on the screen.
Force rebooting didn't help. To check if it boots at all I connected the external display and surprisingly it booted to the system, and I was able to log in to the system.
However, I noticed that it was in some weird state:- The fan was still blasting at full speed. It's blasting even when the system
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Greetings to the entire forum, I ask you for help because I'm going crazy. A dear friend of mine gave me a macbook pro M1 A2338 that only works with an external screen. With the internal one, no backlight or image. Only the external display is detected from the system settings.
First I changed the display flat, then I made a backup with time machine and tried a reset in dfu but nothing to do, always the same problem.
I analyzed the logic board, it shows no sign of liquid or visible damage. I then moved on to examine the logic with the thermal camera and found that the UP701 chip was... -
Greetings to the entire forum, I ask you for help because I'm going crazy. A dear friend of mine gave me a macbook pro M1 A2338 that only works with an external screen. With the internal one, no backlight or image. Only the external display is detected from the system settings.
First I changed the display flat, then I made a backup with time machine and tried a reset in dfu but nothing to do, always the same problem.
I analyzed the logic board, it shows no sign of liquid or visible damage. I then moved on to examine the logic with the thermal camera and found that the UP701 chip was...
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