If you iPhone 6 plus touch function not working, what can you do? All you need to do is find the best way to fix it！Would you consider why the iPhone is suddenly out of touch in normal use? According our experience, it may be 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.
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 junkmotherboard, and then fill back the capacitor and install the touch IC.
Assemble the Phone by phone screwdrivers, supply power on it, then test it, the touch function is back to normal. The repairs end!
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