Fault description: iPhone 6S Plus occurred touch panel fault
According to our ever experience, it is great possibility to be caused by IC fault. If you are clear about this part, you may just need to change it, let us start today's analysis.
iPhone 6S plus touch IC is on the touch screen, so there no need extra operation for phone motherboard, it will be easier for the next repair procedure.
By checking WUXINJI schematic diagram, we can see that the power supply of the display and touch screen is supplied by U4000 and power C--U2000.
The power IC provides a 1.8V power supply, and U4000 provides 5.7V to 5.1V voltage. As shown in picture 1-1.
picture 1-1
The inductor FL4200 FL4205 FL4207 FL4208 FL4209 FL4210 is easy to corrode, resulting in no indication, no touch. If you encounter the same condition, short connection can solve the problem.
If there is no light and no display, first you need to do is to install the iPhone 6s plus screen (Since it is more troublesome to install screen for measurement, you can also short connect by jumper wire as the green line remarked in picture 1-2, then use Fluke 15B+ digital multimeter to measure the IC output voltage 5.7V on single logic board directly.
picture 1-2
If there is no 5.7V on the components as shown in picture 1-3, it means that the display screen power supply IC--U4000 is damaged, the solution is to to replace a new U4000. If there is 5.7V, you need to check the short inductance FL4200 FL4205 FL4207. If there is touch failure condition, check and short connect FL4208 FL4209 FL4210.
picture 1-3
While doing the corresponding deal as followed our guiding, you will get the right result.
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