To Update need to connect to recovery mode and install os online by wifi .T2 chip not accept restore by apple configurator only serie M1 and M2
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From post # 4, we know that PPBUS_G3H created by U7000 is not yet boosted to the ~13 volts by the SMC.
Measure the voltage to ground of the following points of interest:
I2C_PWR_SDA
I2C_PWR_SCLComment
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You replace t2 chip ! was have serial number !Comment
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Post #25Comment
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I've just swapped T2 from one a1989 (that was not working - burned display pin in cpu). To another a1989 that was icloud locked. Nothing else just T2
First thing you have to do is boot to DFU and connect to another macbook with Apple configurator 2. Device must be shown as apple device (under DFU in apple configurator, if it shows DFU but under is Unknown device that is probably because T2 is bad or bad soldered)
second Revive (that can end with error - but you need to have apple logo at least on the macbook)
third when it finished (at least for me it was so) macbook started in DFU and i go to Restore via apple configurator (whole process until padlock)
then macbook started that no OS installed (flashing folder icon). I've restarted it in internet recovery (CMD + Option + R) reinstalled os and it's working.
everything except fingerprint (i have to find correct fingerprint that was married with that T2)Comment
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Hello,
I need help with Macbook A1989. It stuck at 5V / 5mA.
I already do some measurements https://logi.wiki/index.php/CD3215_Bootup_Sequence
PP20V_USBC_XB_VBUS - 5V
PP3V3_UPC_XB_LDO - 3V
PP1V8_UPC_XB_LDOA - 1.8V
PP1V8_UPC_XB_LDOD -1.8V
PP1V1_UPC_XB_LDO_BMC - 0V
It's the same on all CD3215. There is no signs of corrosion or something like that.
What should I check?
Thanks for help.
Thanks
Martin -
Hi,
Preface : My primary job it's not repairing logic board, so please excuse me.
The Macbook A1989 is stuck at 5v at 0.3A on three usb-c port, and in one port no absorption, so the incriminated chip may be the CD3125.
I'have read that these mac have two CD3125 in daisy chain.
How can i confirm my diagnose before reballing it? Someone have experience with this issue?... -
Hello everybody! Posting this in hopes somebody has some expertise that leads to a clear path of troubleshooting that saves me a lot of time!
My macbook has the flex cable problem, the one that prevents the screen turning on. Ive been dealing with this for the last 3 years. Last year it went dead and I managed to fix it following youtube tutorials. But my fix wasnt the best, the problem returned a month later. This week, it went dead again. I again tried to fix it.
This time the original cable broke too close to the screen, it can't be fixed without tearing the screen... -
Hi,
I have a MacBook Pro 13 inch A2238 M2 and it was stuck 5V with 0 amps. I measured some important lines and I found a short on PP3V8_AON_MPMU_ISNS_VIN, I tried injecting 1v and I saw heat coming from the mPMU so I removed the pmu thinking that was the problem. I don't know why I didn't check the other side of the border but there it was, a shorted cap. I replaced the cap and the short was gone, so I reballed the PMU and put it on again but voltage was still stuck at 5V and the current was fluctuating between 0 and 0.45 amps. I checked under the thermal camera and I saw the mPM...04-02-2025, 05:02 PM -
hello everyone, let me ask, I have a macbook which is stuck at 5v and 0.03 A when tested with a usb tester. Previously I wanted to replace the screen on the device, but by accident I forgot to unplug the battery. This caused the MacBook to get stuck at 5v, previously I had replaced the CD3215 (U3100) IC because it was warm. After I replaced it the problem was still not resolved. Please guide. Thank you
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