PlayStation 2 Displaying Corrupt Images

Afternoon all. So I just got this unit, SCPH-39003, turn it on all all displayed OK. Then after a few moments the images became corrupt. I thought it was a dodgy video lead but I’ve tried 3 and all having the same issues (one lead of which I know works).

I have tried turning off the switch at the back and powering back on but no joy. I have tried with no controllers plugged in or memory cards and even another power lead but still having the same trouble. I had a brief second where it went back to normal and then went corrupt again.

I also tried loading a PlayStation 2 disc to see if it looks the same with a disc loaded and it displays the same problem.

Any advice greatly appreciated. Image attached.

Thanks