I'm going to try that on the chips next to the video board. And yes, it only happens after I've had the computer on for a while.

The monitor works fine on the Quadra 700 after it has been on for a while, clearly not the monitor here but something on the LC board.

I'm thinking of picking up an extra LC board to part out and am also looking for a video card for the empty PDS slot. However, I'm hoping to fix the internal video first since I recently got a IIe card that I want to put in the LC.