DOA machines happen...Even with Apple. I recently opened an sealed iPhone X with a nice fat scratch on the glass. Luckily for the customer I noticed it, otherwise he'll have a !&&* of a time explaining that to the customer service.
telefoon uitzetten, touchid 1 aansluiten, telefoon aanzetten, als je de verkeerde hebt aangesloten zie je nu in beeld: touchid is niet beschikbaar. Als je dat niet te zien krijgt heb je de goeie te pakken.
The guide for the iPhone 7 Plus states that it uses 1.1mm Y000 for the 6 shield screws and one 1.8mm philips. Since most of the other screws seem to be the same length my guess is those will be identical as well.
My thoughts point towards the magnet sensor that senses a magnet inside a case, telling the iPad to wake up if you uncover the screen. I never checked the schematics for that but considering the symptoms of your issue i guess they share the same circuit. This sensor is soldered on and should be removed and replaced to the new assembly with a heat gun or something like that.
There are temparature senors that can be blocked by ice, depending on how the engineers designed your freezer. IF they are blocked by ice, they'll sense a lower temp than the overall temp inside of the freezer, and think everything is OK and won't be adding extra cold.