MacBook A1989 820-00850-A

[ZENDR]

Hi all,

I've got a Macbook 2018 with touchbar that doesn't seem to be powering on. Doesn't have liquid damage or visible damage.
- takes 20.2V and 0.4-0.5A
- lcd doesnt appear to be turning on
- no backlight, no keyboard light, no touchbar

I got the schematic, and started to measure voltage on some components.
Some clues where to start looking would be most welcome
Any help is welcome

[mon2]

Re: MacBook A1989 820-00850-A

Measure and post the voltage of

1) PPBUS_G3H.

2) I2C lines.

See attached.

[ZENDR]

Re: MacBook A1989 820-00850-A

Ppbus_g3h 12.6v
i2c_pwr_scl 1.8v
i2c_pwr_sda 1.8v

[ZENDR]

Re: MacBook A1989 820-00850-A

Its fixed! It wasn't a hardware issue after all.
I was able to get another Mac with usb-c and restore mine using DFU mode and Apple Configurator 2 on the working mac

This guide is very helpful on how to enter DFU and how to restore:
https://mrmacintosh.com/how-to-resto...into-dfu-mode/