Hi,

I have a MacBook Pro 13 inch [B]A2238 M2[/B] and it was stuck 5V with 0 amps. I measured some important lines and I found a short on [B]PP3V8_AON_MPMU_ISNS_VIN[/B], I tried injecting 1v and I saw heat coming from the [B]mPMU[/B] 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...

Hello,

I am trying to repair the laptop mentioned in the title. I have been searching posts looking for readings similar to mine but cannot find any. I am fairly new at this so please be gentle 🏳

History:
No water damage, screen cracked. Laptop doesn't draw any amps on USB meter from either USB C port. Removed the board, same no amp draw. No standby light on the board. Apart from dust board looks great! No obvious visible burnt components. At the moment I dont have a Mac charger, its on the way. I am using a samsung USB C charger which should get the board on...

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...

Hey guys, just troubleshooting a MacBook Pro A2289 with the 820-01987 logic board.

No fan spin, no booting, device not getting detected by the Apple Configurator.

Did a few basic things, the board gets to 20V USB supply according to my USB tester, F7000 fuse seem to be ok and not blown.

Board draws about 0.5A for about 10 seconds, after that it goes down to 0V. Found an n channel FET (Q4830) in the backlight supply(?) that could to be blown (pictures below), not quite sure about that, but t assume that should not be relevant, because I was testing the board...

Hi all

i have a 2338 which had no display (there is a little crack near the edge to the case) but worked with external display. Some weeks later it didn`t boot anymore.
USB Tester shows 5,18v, 0,08 a and 0,38w with power supply.
With battery connected i get 20v and 0,0 a
Thermal camera shows that U0500 is heating up to 30c.

F5200 is not shorted
Visual inspection didn't show any problems.

I'm sure that i need to change the display but what can i do to find my other problem with the board?...

Hi,

I hope this is the correct place to post about this device. I originally posted regarding this on iFixit so see the details from that post below:

"I'm hoping someone can give their opinion on the symptoms I'm seeing before I spend any more time and put money into this. I got this MacBook from a customer and after looking at it they decided they didn't want it.

It doesn't turn on and there's no visual signs of life. I have tried resetting the NVRAM, SMC, power cycling, unplugging the battery, using the charger with the battery unplugged. Removed the...

[FONT=Verdana]Hello everyone.[/FONT]

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

[FONT=Verdana]No CPU Voltage.[/FONT]
[FONT=Verdana]U7800 Does produce voltages.[/FONT]
[FONT=Verdana]T2 Chip warming up very very little.[/FONT]

[FONT=Verdana]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...