Hello everyone, I have a very interesting issue on this M1 i haven't seen on previous gen intel boards.So i'll give the back story on what happened to this mac. I purchased it damaged from a friend so i knew they didn't open it up. They spilled lemonade on the keyboard and it shut off. When i opened it up, there was surprisingly little liquid actually on the motherboard itself. Most of the damage was located in the LCD/Keyboard backlight area but even so, it didn't look that bad. I cleaned it very well but no components had to be replaced as they all tested fine (just checking for shorts/diode readings) so i attempted to boot. When i booted it went straight to the restore screen with the exclamation point. I had no access to any recovery partition at all. The only thing i could do was restore with apple configurator 2. After restoring the computer came back to life but did not detect the wifi chip. I ran apple diagnostics and it also indicated an issue with the wifi chip. Because of this the computer boot loops every minute. I can load into the OS and use the computer for about a minute before it shuts off by itself and boots again. When it boots back up i get a kernel panic message. So i started to investigate the wifi circuitry to see if anything obvious was damaged there, and i practically found nothing. no shorts, all components read to spec, i am getting all of my VDD power rails into the wifi module, as well as .634V on my PMU_CLK32K_WLBT data line, and i also have voltage on my WLBT_PWR_EN. During the boot sequence, the moment i receive WLBT_PWR_EN voltage i get a blip of 1.2V on WLBT_RESET_L indicating it tried to start but immediately shut off. After that i never see any more attempts to bring up the wifi module until the machine reboots again. i never see the 1.8V rails turn on from the wifi chip. With no apparent shorts, and all voltages present i see no reason this module wouldn't work, unless an overvoltage event occurred near the liquid spill and damaged the chip internally. I'm sure others have had this issue and i'm just trying to figure out if someone has a solution, or knows whats going on. Are these wifi/bt modules easy to kill? Are they replaceable? i imagine there is some kind of encryption that would prevent just a simple swap.
-
-
OpenBoardView — https://github.com/OpenBoardView/OpenBoardView -
Re: A2338 M1 Liquid Damage and WiFi dead
Well crud. Looks to be what happened to mine. I also traced it down and found a 500 ohm to ground short to the wifi chip. What a terrible design.Comment
-
50 ohms is normal resistance and that’s not the problem. There is a via hole under the test point tpl002, there is a corrosion signal "wlbt_pwr_en" does not reach the wifi moduleComment
-
Hello everyone,
This is my first post after browsing this wonderful treasure trove of knowledge for many, many evenings. I've decided to learn how to fix these things, properly.
My patient is an A2338 Macbook Pro M1 (late 2020).
It had some corrosion around JT710 and JT700 caused by liquid spill, as well as against the protective barrier around the USB-C chips UF000 and UF100. So I took the main board out and cleaned it with a toothbrush and alcohol, then with alcohol in an ultrasonic cleaner. Cleaned the touchbar flex connectors as well. The board looks... -
Hi all,
i have a A2338 with water damage on the logic board. Cleaning it showed some heavier corrosion around U7000 and surrounding caps. Some are totally broke.
I get 5,2v when using both USB-C Ports but until now i didn't make any more tests.
Since i'm a beginner i want to know next possible steps. I'm not afraid replacing the intersil 9240hi but the other parts with 1mm or 2mm scare me and i don't know where to get replacements.
I fixed other laptops but this ist my first apple device .... -
Hello, First of all thanks you for reading this topic.
I need your help with identify missing parts on trackpad logic board (661-18430).
The liquid got into the orange area, but I found that the green area had some parts missing or burnt.
Please help me with identity parts from blue and red area . -
Hello guys.
I Have an a2338 with a big problem.. it keeps random freezing and it needs to be powered off from the Power button.. usb fpc connector was completely burned and it has been replaced.. is there a method in order to understand what causing this issue?
Thanks...06-10-2024, 11:09 AM -
Hi. Recently serviced a damaged A1466 Macbook Air. Thought to post the issues and resolution for each.
Macbook AIR Model A1466 Diagnostic 09-01-2021
Issue: Liquid damaged (beer spill) Macbook AIR will not power up.
Problems & Resolutions
1) Attached Apple magsafe power adapter. No green / no orange light. This confirms the absence of the PP3V42_G3H voltage rail. The PP3V42_G3H rail is the primary voltage rail necessary to communicate with the magsafe power adapter to report the green or orange light status to the end user....09-01-2021, 09:31 AM
Comment