@Severence no worries, it’s too bloody cold to sit in the shed at night trying to figure this out anyway lol.
I kind of came to the same conclusion as you about VREF as couldn’t see anywhere else it could be coming from although there could be a via under a pad or something.
Does make sense about the diode frying the chips as this one hasn’t gone up in smoke yet so a bit of a good sign so far.
I will try to check the resistors but my multimeter probes are not very fine so do struggle with so many small ones so close to each other. I could try to remove to check but have quite a few of the 0205 ones in the 9th dimension already that it is risky.
The cap doesn’t look good on the side connecting to the IC so may have to replace that. Diagram stakes its 0.1uf, unfortunately my donor is missing the ones above the IC but looking at other posts, it looks as if the ones below the P13 chip are the same so may try to swap one of those out and replace the resistor at the same time for good measure and see what difference it makes.
The datasheet also shows a link between C3 (NON1) and the middle of the 2 resistors coming off VREF but cannot see how that connection is made either. Looks like -5v has a via near the LCD FPC connector but god only knows where that goes. May try tracing it back and make sure I haven’t messed with anything on that side too but as I’m not getting the 1v on VREF, probably not the issue right now.
Appreciate the time you are taking to look into this and try to help me, out of 2 switches I am trying to fix, this one I got with missing components, faulty USB-C and no idea what else is wrong with it and the other one with warped board causing bad ram connections and possibly a bad EMMC it’s certainly not giving me an easy ride for my first go