So double checked the pins on U1, looks like some were slightly shorted. Lesson learnt, don’t be too generous with the solder paste if you choose to cook it in the oven.
Thanks heaps for your help everyone (especially marqs). I will take it home and test over the weekend with the other consoles.
One other thing I have noticed with the PS1 is that the image is to the right of the screen and thus slightly cut off on the right. Will keep playing