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MEOWING IN THE IMPOSSIBLE UNIVERSE! -
I know this has to be something easy to fix if we knew where to look. No bites?sigpic
MEOWING IN THE IMPOSSIBLE UNIVERSE!Comment
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Cannot run Diagnostics it crashes. Still sitting on this in our shop. Something we own, board is perfect looking. Did replace ISL9240 and still has the same issue even with new chip so that rules that out. Thermal sensor? You think that is something I can pin point not he board and replace. I have a few donor boards on hand.sigpic
MEOWING IN THE IMPOSSIBLE UNIVERSE!Comment
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Hello, now coming back to this computer. Still boots and runs fine for one minute then crashes and repeats once it warms up. Any idea where I can look on the board to fix this issue? Would like to know where to start for this. Easy fix I believe but would love to know where to start. Thanks again.sigpic
MEOWING IN THE IMPOSSIBLE UNIVERSE!Comment
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Can you access the System Logs? Just hoping something was written to indicate what happened?
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I'm assuming (probably like you) that it's a thermal or voltage sensor that is reporting over a limit.
I can only think you check each one when it powers up and see if any are looking a bit odd.Comment
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1) Can you DFU this unit?
2) Review each and every I2C line on the board. Check their voltage to ground and compare against the schematic expected voltage levels. If an I2C line (SCL and/or SDA) is stuck, then the I2C slaves (mostly sensors) will appear to be defective. The reboot power cycling may be from a timeout of the I2C slave nodes.Comment
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Hi everyone,
I'm working on a MacBook Air 2020 (A2337, board 820-02016) and running into a strange USB-C issue. I've gone through quite a bit of testing and part replacement, but I'm stuck — hoping someone here can shed some light.
🛠 Original Issue
The machine initially wouldn't negotiate 20V over USB-C — stuck at 5V.
Diagnosis showed PP1V5_UPC0_LDO_CORE shorted to ground.
I replaced U3100 (UF400) using a donor board (A2179), and the machine powers on fine now.
⚠️ New Problem: One USB-C Port Only Works in One Orientation... -
I have a 2020 Macbook Pro A2289 and after many attempts managed to get it into DFU mode, using my older 2017 A1706 Macbook Pro (Running Ventura 13.7.8). However, when attempting 'Restore', it fails at step 4 of 4, showing the following error:
- "The operation couldn’t be completed. (AMRestoreErrorDomain error -1 - Failed to handle message type StatusMsg (Generic error)) [AMRestoreErrorDomain – 0xA (10)]
- "The system cannot be restored on this device. Failed to create new state machine for restore [com.apple.MobileDevice.MobileRestore - 0xFB1 (4017)]
...08-30-2025, 10:27 AM -
Subject: Help Needed: MacBook A1278 (3115) No PPBUS_G3H Issue
Hello everyone,
I'm working on a MacBook A1278 with the 3115 logic board and facing an issue with no PPBUS_G3H voltage. Here's what I've checked so far:- U7000 Measurements:
- Pin 3 has 0V, even though R7012 shows 16.5V from PPDCIN_S5_CHGR.
- Resistors:
- I measured R7010 and R7011 with one leg disconnected, and both tested OK.
Based on these findings, I believe U7000 needs to be replaced. However, I have a related question:- If I also decide to replace the SMC, do I need to order it pre-programmed,
- U7000 Measurements:
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I have a brand new 13.6-inch MacBook Air M4 that was only used for three days and now has water damage. A glass of water was spilled over it. I examined the motherboard and there was only water next to the display connector. I cleaned it with isopropanol and the components look clean. The MacBook obviously turns on and draws 20 volts from the power supply. The keyboard backlight comes on, but the display remains black. Where should I best start? Even when I shine a light on the display, I don't see any image. I have all the tools I need, including an infrared camera. Where should I best start?... -
Hello there
I have problem with Macbook Pro 15" 2017, model 2017, MB code 820-00928.
I bought it as broken with some artefacts on the screen, first I thought that this is problem with ribbon cable but after inspectiing ribbon cable I know it is fine. I tried to reinstall macOs and then I figured out that this must be something with GPU as installation freezes at the end (when drivers are loaded). I installed Windows and was able to install every each of drivers except GPU driver, as soon as I tried to install GPU driver - black screen and restart.
...11-21-2024, 05:25 AM
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