Hello, I'm new to this level of troubleshooting (had not heard of openboardview 30 minutes ago), but have a multimeter and just found the schematic for this mainboard (820-01041-A).
Board & battery were replaced by Apple late 2021, stopped working late 2022 after sitting on a shelf for a while, and haven't touched it since. Did some googling for similar posts, and tested these voltages with the laptop plugged in. I only moved the charging cable to a different port for testing PP20V_USBC_TB_VBUS, not sure if that's relevant.
Board & battery were replaced by Apple late 2021, stopped working late 2022 after sitting on a shelf for a while, and haven't touched it since. Did some googling for similar posts, and tested these voltages with the laptop plugged in. I only moved the charging cable to a different port for testing PP20V_USBC_TB_VBUS, not sure if that's relevant.
- PPBUS_G3H@F7000 (asked for here on a similar post) is showing 12.28v, but no draw (.3w) at the wall outlet.
- PP5V_G3S@J6000 is exactly 0v (mentioned here, as are the following ports)
- PP3V3_G3H_T@C7669 is 3.3v
- PP20V_USBC_TB_VBUS@TP1 is 5.15v when the charging cable is plugged into the lower port on that side. Otherwise 0v.
- PP3V3_G3H_RTC_X@TP1 is 3.3v