Power button not working after screen repair

"it is a bad solder joint on the home flex.

the home flex is also the lock sensors for the smart cover.

if it does not have a complete connection then the lock function of the on/off button will not work"

this is why, no tape on aftermarket digitisers, switch over from old to new digitiser (see picture)

Switch the tape across as pictured above. It 100% worked for me. Put the old and new digitiser side by side and you will see the difference. I believe the metal frame makes a contact with the home button flex causing it to think it's always pressed.

I had the same issue and resolved it by re-touching my solder work on the home button flex ribbon - (the smaller set of joints that attach to the glass)

"iPad Mini Checklist,

POWER OFF that device

No metal tools

Remove the long pads on the bottom of the LCD

Move tape from old screen to new screen (near the home button flex, or use a non conductive tape to cover all the exposed circuits)

If its pre-assembled and the power button is not working, its either a bad solder or bad IC Chip (you can try retouching the solder, but if its under warranty I wouldn't mess with it unless its a last resort)

Mini's give me a different problem everytime."