A2338 2020 13" MacBook Pro

= Board Number: 820-02020 =

=== **Important** MacBook logic boards with a M1 processor may display 20v, 0.01 amps as measured on a USB-C amp meter if the board is out of the enclosure with the display disconnected. This is normal and is an operating characteristic of these boards. The device may be fully booted into an operating system with this amperage due to the M1's power conservation features. === Intermittent Power Issues

MacBook will sometimes turn on and sometimes wont. Amp Meter will read 5v 0a and amperage may sometimes fluctuate. PPBUS_AON will be at 12.2v. When MacBook is shutdown it will refuse to shut off completely and not turn back on when forced off.

The Cause of the issue in my particular case was PMU (U8100). The board was pristine but keyboard key "F" and surrounding keys had a dim backlight. Which led me to believe there was prior liquid spill but did not make it to the logicboard. Those keys were right above the PMU/CPU. Once PMU was changed the issue was fixed. Reflowing PMU may bring it back to a functional state temporarily but only do this for testing and not as a fix.

-GR Computer Tech