So, I tried this and tested the cable before plugin it in, it has worked for a short while, but the image was reveresed and I had white horizontal lines on the screen, sadly, that was it, I shut it down quickly but now I don't have any picture on my SE with the SE board plugged in, I have 12v and 5v and I it does the booting sound.
The logic board was marginal so perhaps something has given up.
weird toh, why the signal would be so different?