Require technical advice on what may be broken (iPhone 7 Plus)
I have a friend who not long ago accidentally shut the van's door on his beloved iPhone 7 Plus, and well...++this was the end-result.++ (Keep in mind it was fully functional however)
I offered my help to attempt fixing it as I knew parts are really cheap nowadays on eBay and I diss/assembled a few phones before. I am nowhere near precise or professional, I only do it to save myself a lot of money and for my friends.
Now, I've bought a new screen, a new rear housing and put everything back together. It all looked good and all, however when I connected the lower board's cable to the main motherboard (which I believe is connecting the lower board to the main one), the bottom board does not seem to get any power, hence when it's all connected together, the phone wouldn't ever boot up. Strangely, when the cable isn't connected, the phone boots up, however from my testing: the charging port doesn't work, neither the vibration motor. With that in mind, I assume that neither the microphone, speaker work also as they do not get power and aren't fully connected to the main board.
This is ++the original one++.
So, I thought that I might have screwed something up and damaged the bottom board, so purchased a new one. A few days later, I disassembled and put the iPhone back together, only to find out that the brand new, undamaged lower board is affected by the same issue. It doesn't charge, nor it has any haptic feedback - and assuming the speaker and the microphone also do not work.
So here I am, a few days later. I've looked everywhere on Google to see if others had a similar problem, but found absolutely nothing. Would anyone perhaps be able to point out a few things on what I should search/look for, perhaps experienced the same? Any advice would be much appreciated.
If nothing works out, I will either take it to a repair shop and see if they can figure it out, or sell it for scrap parts. (My friend has neither warranty, insurance or AppleCare, so taking it back to Apple - especially after I've changed the whole housing is not an option)
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