Weird proximity sensor bug iPhone 14 pro

Hello guys,

this is my first post here because I have two iPhone 14 Pro‘s with an bug that seems so weird to me. I repaired both phones displays and now I encountered the weird situation that the proximity sensor seems to not work right and is super unreliable.

Both phones have DD Aftermarker Soft Oleds with 120 Hz Rate + transplanted Display IC. The phones work fine but the only thing that happens is that if there is a new message the display won‘t get activated to show the popup and that during listening to an Whatsapp voicemail e.g. the proximity function activates random and if activated sometimes doesen‘t end itself unless you push the powerbutton.

I did further testing with different flexes, I put new adhesive on the sensor because I thought it was bleeding light and nothing helped. If I disconnect the flex at all, I get a lit up display on pop up messages, proximity logically doesen‘t work anymore.

I also did an full reset using DFU, nothing changed.

One more thing I noticed is that when I put pressure on the display while in phone in an certain area around the corners, the proximity gets activated and if I take my finger away it sometimes deactivates and sometimes not.

The only thing I can imagine to be the cause is the display itself because its the same error in 2 phones. But the seller said they had no problems with it in general. What I also don‘t understand is why I get lit up screen without flex and no lit up at all when connected even tho the prox is not activated all the time until I put pressure or it‘s randomly activated.

Last step will be to buy another display for me but maybe someone has encountered the same problem or has an hint for me.

Thank you very much,

Yours

Theo