A1989 EMC3214 can't boot to USB drives due to T2 but SSD can't be initialized and Macbook freezes then reboots in recovery

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • MullySculder
    New Member
    • Jul 2024
    • 1
    • Canada

    #1

    A1989 EMC3214 can't boot to USB drives due to T2 but SSD can't be initialized and Macbook freezes then reboots in recovery

    Hey folks, I'm working a 2018 13" Macbook Pro that I can't get to install an OS on.

    This was given to me by a friend who told me I could have it, if I fixed it.

    I've noticed a couple of dents on the laptop case and the touch bar doesn't have any activity lights when first turning on. When I boot up the machine, it gives a folder with a question mark. When I do eventually get to internet recovery with High Sierra, I can go to Disk Utility but I'll get errors when I try to erase the 512GB SSD. First Aid comes back with no issues. But if you linger too long on anything, the laptop will just reboot.

    I've done an SMC and NVPRAM reset as well. I even tried running Apple Configurator 2 and have gotten the laptop into DFU mode many times using an M2 Mac Mini. I even reached Step 4 of installing the OS but the process fails and nothing happens on the laptop.

    I spoke to Apple's chat support whom figured it could be the SSD, but it needed to be booked in for an appointment. I spoke to the store that was going to look at the machine, who told me that it would have a diag. fee attached, but because the laptop was taken a part, they would stop service.

    Apple's built in diag. comes back with ADP000. To be clear, I'm not a novice with computer builds and fixes, but I haven't worked on too many Apple machines.

    I even tried Checkra1n and that also won't finish in DFU.

    I have a hot air reflow station that I picked up off Amazon, a budget soldering iron and soldering gun (that can be used on cars).

    I spoke to a place that can reprogram the T2 chip and was quoted $199.99 CAD, which I'm not sure is even worth it. A replacement "logic" board is 300-400 and I could do a board swap. However, as this laptop is now mine to figure out, I thought I'd head over here and see what you folks have in mind. The place that can reprogram said that the issues I'm getting a symptoms of a T2 chip that needs to be desoldered, reprogrammed and soldered back.

    I took the back off to check for dust buildup and such; my friend told me he repasted the CPU a few months back but I haven't done a teardown to verify that. I'm suspecting that the SSD could be wrong since it fails whenever I try to format/erase. Especially as, when I go to select a startup disk to disable the T2 security, it says no Admin can be found. Same as when you try to install Mac OS. The laptop does get quite a bit toasty, but I hear that's standard for Macbook Pros.

    If you have any ideas, before I start tearing this laptop a part, please let me know.

    The good news, the screen works great, the keyboard feels nice and the touchpad is large.

    Please ask me for any further info you require and I'll see what I can get you. I do believe this has an i5 and 8-16Gigs of RAM.

    Thanks again,

    - MullySculder

Related Topics

Collapse

  • modtool
    Macbook Pro A1989 fallen, reboots if touchbar connected
    by modtool
    Hi to all,
    the owner of this macbook brought it to me after a fall, that hit the upper right corner of the top case.
    Luckily enough, the screen and all other parts of the machine haven't been damaged, only the touch bar wasn't lighting up anymore, and the macbook began to behave strangely, because it seems to start and work fine but suddendly it shutsdown (and at the same time the fans make a high rotation for half a second, as if an animal was annoyed by something...) at random times, sometimes after 2 minutes, sometimes after 5 minutes, but never over 10 minutes, then restarts...
    11-10-2023, 07:42 AM
  • ErinV
    MacBook Pro A1989 820-00850-A not powering on
    by ErinV
    Hey everyone!

    I have a MacBook Pro A1989 with a 820-00850-A board that recently stopped working. I used it overnight to charge my phone, in the morning it didn't turn on, I assumed flat battery but now won't charge and doesn't start at all.

    I have fully dissassembled it, when disconnected the battery reads at 0.012V. Even with the battery disconnected the laptop doesn't boot.

    The diode voltages around all 4 CD3215's seem fine.

    For all CD3215 (UB300, UB400, U3100 and U3200) I read just above 5V on PP20V_USBC_TA_VBUS, 3.3V on PP3V3UPC_TA_LDO, 1.8V...
    09-30-2024, 10:21 PM
  • Madoy104
    Macbook Pro A1989 - No image, working fine with external monitor
    by Madoy104
    Hi everyone,


    I have a MacBook Pro A1989 that was likely exposed to liquid. It doesn't display an image on the built-in screen, but the screen is backlit (you can't see the Apple logo or any other elements when held up to light). The laptop provides 20V and 1.5-2A, and it works fine when I use it with an external monitor. Currently, the connector for the display (J8500) is disconnected. I'm writing to ask for help in diagnosing the issue. I've heard that when the J8500 is exposed to liquid, the processor pin responsible for the display might short-circuit, and I'd like to know...
    08-15-2024, 10:01 AM
  • PITERPENY
    Macbook A1989, 820-00850, won't boot. 20V, 0A.
    by PITERPENY
    Today I have a MacBook A1989 at work 820-00850. When assembled, the laptop switches to 20 volts but the consumption is 0.00 ampere. if the motherboard is on the table then the consumption of all ports is 5 volts and0.35 amperes and does not go to 20 volts only if you assemble a MacBook.
    Here are some measurements, maybe someone can tell what the problem is.
    The initial problem was a burnt out induction coil L8504 (replaced).
    When connected to another MacBook, it constantly hangs in dfu and cannot install updates, something is wrong.
    here are some measurementsmotherboard...
    01-16-2024, 02:19 PM
  • Nikan.e
    MacBook A1989 repair / no CPU voltage no boot signs
    by Nikan.e
    Hello everyone.

    I have recently obtained a MacBook Pro A1989 model with a touch bar and Apple ID. Unfortunately, it does not want to start up.

    No CPU Voltage.
    U7800 Does produce voltages.
    T2 Chip warming up very very little.

    I do have voltages like 1.8, 0.9, 3.3, 2.5 volts, etc., present. I did not find any short circuits. Unfortunately, the device has no touch ID/start button. So, I have used the debug jumper to put the device into DFU mode. - It is getting recognized as a Macintosh while not in DFU mode and as Apple (DFU) while in DFU mode....
    11-24-2023, 11:55 PM
  • Loading...
  • No more items.
Working...