A2337 2020 MacBook Air

A2337 (820-02016) MacBook Air

=== **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. ===

820-02016 Base Power Sequence (Main rails only)
Once a valid external power source (Charger or battery) is connected, the following rails will come online.

PPBUS_AON- Normal voltage ~12.6 - 13.1. Produced from the ISL9240 (U5200) that uses PPDCIN_AON_CHGR_R as its VIN.

PP3v8_AON_VDDMAIN- Normal voltage is ~3.8v. Produced from U5700 that uses PPBUS_AON as its VIN.