Hey ya'll this is my first post on here. I recently aquired a used/broken 2019 mbp 16 a2141 with the 820-01700 board. Seller told me that the laptop needed a new lcd. However upon doing some troubleshooting i found out the lcd is fine.

Laptop boots like a normal, plays chime, touchbar lights up however there is no image on the internal lcd. If i connect and external monitor while its already on, nothing happens and no image is displayed on external. However if i restart or boot the machine while its plugged in, the external then works and a backlight is now visible on the laptop....

Hey ya'all my names Will. 30 y/o with a passion for computers and audio. Been lurking on this forum for a while. Recently purchased a used and broken macbook that i'm troubleshooting. So far its still broken but I hope to change that soon enough! Thanks for having me!