Chosen Solution
i just wanted to know if when all three ribbon cables are connected should the phone turn on/respond even if not fully reassembled (ie screews not back in place)?
The 2 screws next to the “do not remove” sticker help make contact with battery prongs and antenna pin. I think these are the minimum to check iPhone is working.
your lcd maybe not fully on meaning u must plug it back in or another possibility is check the tiny metal clips on the motherboard and on the cable c if you see all the tiny metal rows if 1 is missing it causes the lcd to malfunction. the 2 screws at the bottom of the iphone have nothing to do with the phone they are only there to support the bottom to the top. also make sure that when u try to turn on the phone the screen is back in place or else it wont turn on. hope that helps
If you are talking about the two big external scrows in the bottom of the iphone betwean the speaker and the mic. these are only for holding the LCD and has nothing to do with circuit, and you can run the device without them. even if the LCD is not fully reassembled you still can run it (but the 3 cables under the LCD must be pluged well).
