No video.. Has backlight and external Monitor video ..820-00928-A

Yep! Bad display assembly.

Before you get a replacement display lets first review what likely happened and how to prevent it from happening again. In Apples race to go thin they forgot the Intel CPU and AMD GPU are heaters! So you don’t want to place a heat sensitive logic near the heat!

The T-CON board is what paints the image onto the LCD panel, that’s the part of the display that has failed here.

To prevent this you need to first not use your system on thick surfaces like a bed or a rug that can block good air flow and the fluff can foul the fans and heat transfer fins so you system overheats! So you do want to clean your system of the dust and debris build up.

The next thing is to push the fans harder when you are running heavy processing tasks using a good thermal management app like TG Pro

Here’s the needed part: MacBook Pro 15" Retina (Late 2016-2017) Display Assembly and the guide to put it in MacBook Pro 15" Touch Bar 2017 Screen Replacement. Apple has been altering things on us so there was a point you could get any screen, now its best to stick with a used screen so the brightness and in the newer systems TrueTone to work properly (it requires calibration using a special Apple tool) if you use a brand new display.