Re: A2289 Board 820-01987-A Dead?

I might add
PPVCCSA_S0_CPU is 1V when The Mbp is taking 0.30Amps for 10sec then goes back to 0V

Re: A2289 Board 820-01987-A Dead?

Piernov thanks again for taking the time here is what I found:

U7100

Pin 41 Vin 12.62V constant
Pin 42 VCC 5.12V Constant

U7270 This one is tough 820-1987 and 820-01598 dont look the same I found U7270 but caps and Res are not populated in the same way on both boards...

PPBUS_HS_CPU 12.62V

On caps and resistors around the chip I found 5.11V, 4.8V and 12.62V (1 Cap)

VCIN not sure
VDRV not sure

Re: A2289 Board 820-01987-A Dead?



Thank you piernov for your kind reply.

You assume right! the macbook showed that it fell on the case....

These are the results to your question


CPU_VR_EN_R 1.8V at 0.29 Amps taken for 10 seconds then 0V

PPVCC_S0_CPU 2.4 Ohms

PPVCCSA_S0_CPU 10.0 Ohms

PPVCCGT_S0_CPU 2.4 Ohms...

Hello everyone, I think I am the worst repair guy here is my story...

I am trying to repair my daughter's board bought 3 months ago she dropped the macbook pro Board 820-01987 Resulting in no Backlight no Image.

I had fan spin and normal voltage and Amps at this point with the board out.

I tried to take some measurement on the display cable.

Unfortunately I felt a quick hot sensation when I did this... I know I know...

This is where I am at:

When I plug in the A2289 I Get 20.4V and takes 0.13A jumping...

Re: New Members - please post your introductions here

Hello, my name is Gary 45years old. The covid confinement made me explore the world of repairs and electronics.

Thank you for the answers i Have already found in this forum and I am sure many more to come!