iphone screen not responding to touch

If you dropped your phone and it immediately went black. When you accidentally dropped your cell phone, and the phone touch function is stopped, what do you do.but it's meaningless. You should try to solve it. You will bring it to a repair place where they cleaned it. If you want to fix it by yourself, vipfixphone.com can provide the guide to help you fix it.
Trouble Phenomenon:
IPhone 6 Plus has no response when slide on screen. The touch function is lost and cannot be activated.
Repair Process :
Step 1
Remove the motherboard , finding there are weld marks on? NAND Flash , as shown in picture.

Step 2
After dealing with the touch problem many times, we know disconnection of pin M1 of touch process chip will cause such problems. Pin M1’s location is shown in picture.

Step 3
The signal name of pin M1 of touch process chip is LCM_TO_AP_HIFA_BSYNC. Chinese name is synchronizing signal of LCD screen and touch communication. The circuit diagram of pin M1 of touch process chip is shown in picture.

Step 4
If LCD screen and touch process chip cannot communicate synchronously, the touch screen definitely cannot be used. After fixing the solder pin of M1, assemble touch process chip and then power on. The touch function recovers. Activate it and enter system to test. The iPhone shows blurred screen. Reboot it and it crashes when the progress bar is going to show.
Step 5
CPU or NAND Flash faults will cause such problems. As the iPhone has been welded before, the NAND Flash has greater chance to have faults. Reinstall the NAND Flash to exclude the possibility of NAND Flash pseudo soldering. But the problem is still the same. Finally, replace the NAND Flash and root to test. It becomes normal. The damaged NAND Flash.

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