iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair

iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair

Machine model: iPhone 6 Plus
Malfunction: the touch of the mobile phone is out of order, and the machine has important information,  which cannot be Update System.

iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair Figure 1.

Maintenance process: First, it is easy and then difficult. First, it is the problem of the screen itself, and then it is the motherboard problem. There is no result in replacing the screen, which seems to be the problem of the motherboard itself. Remove the motherboard, turn on the screen, measure and touch VCC.

iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair Figure 2.

Touch +5.7V of PP5V7_SAGE_AVDDH is normal.

iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair Figure 3.

iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair Figure 4.

PP5V7_SAGE_AVDDH did not touch -5.7V VCC, and then measured another measuring point and found that it was normal. After power failure, the line was disconnected.

iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair Figure 5.

The line disconnection Jump wire was solved, and after the screen measurement, U2402 (sub-touch chip) also boosted the voltage.

iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair Figure 6.

iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair Figure 7.

iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair Figure 8.

iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair Figure 9.

Installation test, touch back to normal. This is the end of maintenance!

iPhone 6 Plus black Touch-5.7V disconnection caused touch failure repair figure 10.