When touch the iPhone touch screen, it has no response, the iPhone 6 touch function failed to work. Here is the repair guide.
Disassemble the iPhone 6 by phone opening tools, remove the iPhone motherboard, we found the iPhone black and white touch IC
have been replaced by former repair man.
After measure them with digital multimeter, all the data tested is normal. Remove the
iPhone black and white touch IC, and then measure the diode data for the solder
pad, it is normal.
Based on previous repair experience, we
know that the iPhone 6 Plus display socket synchronous signal inductance easy
to empty weld and causes iPhone no touch at all. The data of iPhone 6 display
socket synchronous signal measured is about 400 by digital multimeter, which is normal. According to
this repair idea，we replace the new U2403 touch synchronous tube, and then turn on
iPhone test it, but the problem still there.
Remove the touch synchronous tube, and then
measure the 6 pin ground resistance, about 700, it is normal data. When measure
the first pin, we found an anomaly, the resistance value of this pin is
infinitely large，while the normal data should be about 400.
Check iPhone schematic diagram through the WUXINJI Dongle, we know that this pin is connected with a
test point PP2405, the data of PP2405 tested is 400, which is normal, so we
decided use QUICK 861DW hot air rework station to solder the
jumper wire between PP24005 and the first pin on the synchronous tube .
Measure the iPhone motherboard again, the data tested is normal. Install the iPhone and test it, the iPhone touch screen has response when you touch it with your fingers, the touch function back to work!
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