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.[LIST][*]PPBUS_G3H@F7000 (asked for [URL="https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/100237-macbook-a1990-820-01041-a-no-power-on?p=1741306#post1741306"]here[/URL]...

Hi, Dillon from Boston, trying to fix an a1990 mbp!