T112. Can't get external screen to work. White Screen of death

Here’s the full process explained. I made this as a PDF so it could be printed and kept near the mixer.

I have de same SBC as you showed in your picture. Whet do I find pins 6 and 8?

I had to take out the SBC and look. You can find documentation on the web about these units. They are in section of dual jumper location just like on a pc motherboard.