How To Repair iPhone 7 Touch ScreenPosted by rewa on June 28th, 2017 in case you’ve forcibly rebooted the iPhone 7, you’ve restored the iPhone 7 from a backup, you’ve set up the iPhone 7 as new, and you’ve got repaired the broken screen and lcd, and the contact display screen continues to be unresponsive, it’s time to exchange your wondering and look for a completely extraordinary answer.Rewatechnology.com here presents you a refreshing logic board solution regarding to the unresponsive touchscreen issue of iPhone 7. 1. Phone 7 Disassembling Remove charging port screws and detach the display assembly.Disconnect flex cables and remove logic board screws.Take out the logic board.
2.Iphone 7 Malfunction Diagnosing Roll out the maintenance drawing for reference.
Test resistance of the display assembly connector with digital multimeter. Pin 10 worked as AP_TO _TOUCH _MAMBA _CONN _L signal. The signal was connected with CPU AT2 pin via inductor FL3904.
Circuit between pin 10 and inductor FL3904 displays normally.
Test resistance from inductor FL3904 to CPU, the device displays normal value. Then we can draw the conclusion that inductor FL3904 was damaged.
3. IPhone 7 Malfunction Repairing (1)Take down the inductor with soldering iron.
(2)Solder tins on the copper wire. After that, connect the two bonding pads of the inductor with the copper wire. Then cut off the rest of it with a sculpture knife.
(3)Test pin 10 resistance with digital multimeter again, this time we get a normal value, which means the problem has been fixed.
4. IPhone 7 Touch Screen Function Testing Clean the bonding pad with PCB cleaner.Assemble the phone and test.Touch function back to normal
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