jkruns
Member
Last Activity: 05-07-2026, 01:21 AM
Joined: 03-08-2024
Location: Amsterdam
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It turns out the display was indeed toast. I removed the glass, which revealed a huge brownish mess around half of the backlight leds. So in went a new display assembly. -
A3113 TouchID partial read problem
This A3113 M3 had a liquid spill. I cleaned the motherboard, and it worked again. However, TouchID would only read fingerprints very faintly, never enough to actually register a finger. I cleaned all the connectors but that didn't help.
I assumed the sensor itself was broken, so I ordered a new one. After installation and binding to the motherboard again through diagnostics mode, the problem remains exactly as before.
Does this sound familiar to anyone? There is some kind of daughterboard between the Home button and the motherboard, I assume it's part of the top cover.... -
Sorry for posting this in the wrong category, and thank you for redirecting my post.Leave a comment:
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MB Air M3 (A3113) - minor liquid damage, internal screen doesn't turn on
This Macbook was brought in because it didn't chime when turned on, only the keyboard backlight turned on but display remained off (no backlight) and no external display.
Upon inspection, it had some very minor signs of liquid spill around the hinges and display connector, but no visible damage or corrosion even under a magnifying glass. I cleaned the display connector with IPA to be sure. I removed and uncovered the logic board but it looks absolutely mint, no signs the liquid spill reached that far.
I put it back together and now it boots and the external thunderbolt... -
Macbooks Black plastic insulator material - how to replace?
On recent Macbooks there's an increasing amount of black plastic insulating material, covering sensitive components. Starting with the A3113 (M3 Air) the entire logic board is covered with a single sheet of this stuff. I've never managed to remove these covers without deforming or damaging them, let alone keep the edges sticky enough to adhere a second time.
Question to the seasoned pro's here: after you repair a logic board, do you replace this plastic film, stick on the remnants of the original one or leave it bare?
Can you buy this material so you can make your own? Kinda... -
Thank you for that!
With regards to FlexBV, would you say it's worth the investment just for the solution/checklist?Leave a comment:
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Macbook Pro M1 A2338 - how to test for 20V?
I have a stack of liquid damaged A2338's, most of which don't draw more than 5v and thus won't turn on.
So far I've put back the main boards back after cleaning and repair attempts and connected every single component before testing. This obviously take a huge amount of time.
My question is (maybe not limited to A2338 boards): what's the bare minimum that needs to be connected in order to test if it will draw 20V? Should it draw 20V without the battery connected? -
Yeah, I noticed so I tried Sierra and High Sierra as well but it just wouldn't boot from those on external drives.
Spurred on by your suggestion I tried every single release, none of which worked unitl... Big Sur!
Somehow it booted Big Sur without issue and the installer to the local SSD ran fine. I'm updating to Monterey as we speak.
Thank you, you just saved me a $35 EFI chip and a lot of time!...Leave a comment:
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Not the first time (“no bag entry” error) but after correcting with ntpdate time and date are ok.
the Benninger already did PRAM reset several times....Leave a comment:
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A1706 fails to install OS to any disk
Lectori salutem!
The patient is an A1706 model - 2017 mb pro 13” core i7 16GB 512GB 4-thunderbolt ports
Symptoms:- Boots in recovery mode (Sierra)
- Internal SSD is visible and can be erased / partitioned
- Sierra install starts with 6 minutes estimate, but at the end of the countdown fails with “An error occurred while preparing the installation. Try running this application again.”
- The same happens when I connect an external SSD or a USB-C thumbdrive and try to reinstall Sierra on that drive.
- Does not boot from external (Sonoma) bootable thumbdrive
- I have
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As it turns out the battery was bad. The other three batteries are fine, but they didn't work because I missed a crucial bit of information: the large T5 screw that holds down the board onto the battery pcb does more than connect to ground like I assumed. I tested the other batteries without this screw in place, primarily because I removed the batteries from their chassis.
It's still a mystery to me why the battery failed. My working theory is some component on the battery pcb broke. So far I haven't been able to tell the difference between a working battery and the dead one with...Leave a comment:
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It's barely audible, so I'd call it normal fan spin....Leave a comment:
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These issues had already gone away. The only remaining problem is the battery not charging when plugged in or booting from battery only. I'm testing this board with the paired touch id sensor transplanted into a chassis with all 100% tested and working components (display, sound, touch bar, battery, touch pad).
It may be worth mentioning I'm testing this with the board not fully tightened down with all the screws and also without the bottom cover (I do connect all the flex cables every single time I test though). I'm assuming the missing bottom cover will not mess up my test results,...Leave a comment:
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Here's the output of the test on a known good box....Leave a comment:
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Here's what the OS registers about the battery and charging.
Other than "IsCharging" = No I don't know what to make of this....Leave a comment:
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Two more observations.- PPBUS_AON is a touch on the low side (12.02). OBD says 12.4 but on other boards I've seen 12.95V. Maybe nothing.
- I've read several posts from people who've either installed a new battery or depleted their existing battery over a long time, whose macbooks show the same symptoms. Could it be that the issue is not with the board itself but rather these boards really don't like deeply discharged batteries?
Leave a comment:
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I'd love to practice my hot air skills, but the resistance across source & gate are exactly the same on the other 3 boards.
This suggests the K Ohm value is ok, do you agree?Leave a comment:
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Q5265
Source to drain: 1.8MOhm
Source to gate: 3.9MOhm
Gate to drain: 5.8MOhm
The other boards are in the same ballpark.
Q5270
Source to gate: ~360KOhm
Gate to drain: 2.25MOhm
Source to drain: 2.04MOhm
I also checked Q5230 and Q5240. Both seem fine, resistance gates to drains is consistently in the MOhms range.Leave a comment:
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Resistance across C5260 is 2.91Ohm. The other boards read 2.74 / 2.72 / 2.86 respectively.
Unless the tolerances are really tight, this should be ok, right?Leave a comment:
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Makes sense, but how could I have deduced this from the schematics?
There's a list of Power validation test points included in the schematics, but you would have to know what CSO_N and CSO_P stand for or what they do. How did you figure that out?...Leave a comment:
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