iPad 5 LCD Not working in iPad 6?

Strange One.

iPad 6 has come in with a busted LCD. I have a new tested and working LCD from a iPad 5 and its just showing static (grey dots etc with no picture visible).

I tried a damaged but still working iPad Air LCD with the same issue.

I then found a damaged but still working iPad 6 LCD and it worked no problem at all apart from the already known damage as its a test LCD.

I tried both LCDS that didn’t work in the iPad 6 in a iPad 5 and the new LCD worked perfectly and the other worked as advertised (Had some damage as it’s a test LCD)

Considering iPad Air 1,5 and 6 LCD’s are combatable has any one else come across this or have a solution?

Note - I did try a reset with all LCDs plugged into the iPad 6

Thanks