Repair of Nonfunctional Accelerometer Sensor

Well, that may be a bit bigger of an ask than you thought. The accelerometer and gyroscope are actually part of the same chip on the 12 Pro (if I am interpreting the schematic correctly). Which is soldered onto the logic board. And to further complicate things, the 12 Pro Max logic board is actually two separate boards sandwiched together, and this chip is on the inside of the sandwich. Check out the teardown for a better visual on this. The board is visible in step 9 and the chip in question is highlighted in red on Step 12.

It could certainly be replaced, assuming the fault is with the chip itself and not with it’s lines of communication or other related chips. But it requires separating the two boards, removing the faulty chip and soldering the new one in place. Plus testing function afterwards in a specialized jig, and then soldering the boards back together. So it’s a bit of a process and could be costly. I would expect to pay at least $100 for this sort of repair, but would likely be more depending on the person.

The proximity sensor would be along the top edge of the screen near the Face ID and front facing camera parts. You should be able to tell if this functions pretty easily, although I doubt it is related. If you make a phone call and cover the top part of the screen with your hand, the screen should shut off. It should come back on once you remove your hand. This function is a product of proximity sensor data.