A1707 820-00281-10 2016 Powers ON, but no display (no POST?)

[vinaypundith]

Got a 2016 A1707 MacBook Pro with an 820-00281-10 board (Not sure what the difference between this and the 820-00281-A is). The laptop powers ON, the fans spin, touchpad haptic feedback works, but there is nothing on the display or touchbar, and the Caps Lock light doesn't do anything. My first thought is a BIOS brick, that I can reflash with a USB programmer, but are there any voltage rails I need to test first to rule out something like a GPU or CPU power line failure?

 

[2informaticos]

Any history available?
Do you get CPU and GPU voltages?

Don't forget to make backup, before writing the BIOS chip.

 

[vinaypundith]

No history available, unfortunately. Which CPU and GPU rails should I check? And yes, I'll make a backup.

 

[2informaticos]

All the coils surrounding CPU and GPU...