My iPhone Touch Function Fault, How to Solve
The word "Touch Disease" refers to the touchscreen issues that surface after the phone undergoes stress, like being dropped on the floor several times.
IFixit discovered that the issue stemmed from faulty chips inside the devices. When the phone is dropped or bent, the chips become loose. At the time, and called the issue "Touch Disease". It sounds like a made-up illness, but many iPhone owners really have the touch disease. If you think you've got this problem, this article will help you to fix it.
Read More: The Common Problems And Resolvent on iPhone
IFixit discovered that the issue stemmed from faulty chips inside the devices. When the phone is dropped or bent, the chips become loose. At the time, and called the issue "Touch Disease". It sounds like a made-up illness, but many iPhone owners really have the touch disease. If you think you've got this problem, this article will help you to fix it.
Read More: The Common Problems And Resolvent on iPhone
The iPhone 6 Plus that has been sent, customer description says, it suddenly no touch during the normal use and this iPhone hasn't been repaired before. So we know the reason, then we start to fix.
1. We first thought it is caused by iPhone black touch IC M1 pin disconnection. Remove the black touch IC, we found that there were no signs of M1 pin was empty solder or disconnection. Anyway, now the chip has been removed, so we measure the diode data of it with multimeter. Measuring the diode data of several important pins which on black IC solder pad, all is normal. Picture 1-1
2. Then we scrap the M1 pin, and solder a jump wire on it with phone soldering station, now we put back the black touch IC, power on it, and test it, the failure still exists. Now we can rule out this reason. Measuring the working conditions of white touch IC, we found the diode data of white touch IC 5.1V power supply Filter Capacitor only about 70,so we suspect this could be caused by a short circuit inside the touch IC.
3. Remove the touch IC and measure the diode data of 5.1V, it still only about 70, we didn't find the real problem yet. 5.1V in addition to the touch IC and display power IC peripheral circuit, only two of the filter capacitor, so we just pry the two capacitors out. After pry out the capacitors, measure it again, the diode data recovered to over 500, looks like the capacitor is short circuit. We can check it under the microscope, as shown in picture 1-2
4. Find an iPhone junk motherboard, and then fill back the capacitor. Assemble the touch IC, supply power on it, then test it, now it can be touch, the problem is solved.
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