What cause iPhone 6SP No Touch Function

Customer to repair a 6SP no touch, the faulty iPhone 6sp motherboard problem is shown in picture 6-5-1.

Fault Detection :

First observed the iPhone 6SP main board appearance after getting it, we can see it has slight water influent, but no obvious corrosion, also there is no obvious deformation on the board.

Fault Repair:

1. According to our repair experience, the first step is to measure resistance value with multimeter, we find there is no resistance value displayed on J4200-22 pin, so the fault of we are going to solve today is found out now. As shown in picture 6-5-2.

2. After removing glue on the main board, it is found that FL4215 falls off, as shown in picture 6-5-3.

3. How to solve the fault? just directly short connect FL4251, the resistance value is tested normal.

4. Now continue to install the iPhone 6sp screen and have a test, touch function finally gets normal.

Now the fault is perfectly solved! is shown in picture 6-5-4.

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