Some experience sharing about iphone 6 Plus touch unresponsive
Although the iphone 6 Plus sales hit a high number, their enviable success has slightly been marred by the bendgate issue that has given birth to “Touch Disease.” Due to a flaw in design, Touch function failurehas been found to be prevalent on quite a few iPhone 6 Plus devices.
Customer sent us the iPhone 6 Plus to repair, the customer-described failure is that the iPhone 6 Plus suddenly no touch during the normal use and this iPhone hasn't been repaired before.
Because it is iPhone 6 Plus, so 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 10-9-1
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.
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 10-9-2
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.
Customer sent us the iPhone 6 Plus to repair, the customer-described failure is that the iPhone 6 Plus suddenly no touch during the normal use and this iPhone hasn't been repaired before.
Because it is iPhone 6 Plus, so 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 10-9-1
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.
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 10-9-2
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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