Lenovo ThinkPad P14s Gen 1 not POSTing / Black Screen
Hello all 
I have a Lenovo ThinkPad P14s Gen 1 (S/N: PF-2LJ7LF) (Type Number: 20Y1-0011US) (Board Model Number: GT4A1 NM-C801) that appears to not be POSTing after the previous owner attempted to troubleshoot some display issues, and in doing so while trying to install updates (BIOS suspected) seems to have bricked the device. The device charges (LED indicator light turns on) and powers on (power button and keyboard light up), but fans do not spin and the display remains black (no backlight either). Pressing the caps lock key also does not light up the LED indicator.
I've checked it with an external display + with internal LCD connector disconnected -> still no display / POST.
Also tried various other things to troubleshoot such as resetting battery and CMOS, reseating RAM and testing with new known working RAM.
Attached is the BIOS dump. Any help or suggestions for how to flash a working BIOS would be much appreciated.
P.S. this is my first post on here, so hope I've done everything properly :P. Also, many thanks to Knucklegrumble for the LENOVO BIOS AUTO-PATCHER for Supervisor Password Removal. I've bypassed two ThinkPad supervisior passwords so far with the help of that tool 🥂
I have a Lenovo ThinkPad P14s Gen 1 (S/N: PF-2LJ7LF) (Type Number: 20Y1-0011US) (Board Model Number: GT4A1 NM-C801) that appears to not be POSTing after the previous owner attempted to troubleshoot some display issues, and in doing so while trying to install updates (BIOS suspected) seems to have bricked the device. The device charges (LED indicator light turns on) and powers on (power button and keyboard light up), but fans do not spin and the display remains black (no backlight either). Pressing the caps lock key also does not light up the LED indicator.
I've checked it with an external display + with internal LCD connector disconnected -> still no display / POST.
Also tried various other things to troubleshoot such as resetting battery and CMOS, reseating RAM and testing with new known working RAM.
Attached is the BIOS dump. Any help or suggestions for how to flash a working BIOS would be much appreciated.
P.S. this is my first post on here, so hope I've done everything properly :P. Also, many thanks to Knucklegrumble for the LENOVO BIOS AUTO-PATCHER for Supervisor Password Removal. I've bypassed two ThinkPad supervisior passwords so far with the help of that tool 🥂
I bought some stuff to try to repair it and learn as many things as possible about computer repairs but nothing worked so far. When the black screen appeared, my legion 5 pro was connected to my external monitor...
