iPhone 6 Plus Touch Failure repair

Machine model: iPhone 6 Plus
Malfunction: touch failure of mobile phone.
The customer described that it could not be touched, and it had been repaired locally, but after several days of use, it could not be touched again, and the repair was the same several times.

iPhone 6 Plus Touch Failure repair Figure 1.

Maintenance process: according to the customer’s description, the machine should have been dropped, and it must be that the synchronization signal of M1 pin of U2402 BCM5976C1 is disconnected, so it can’t be touched. The peer has already repaired it, but there will still be a malfunction. It seems that the malfunction has expanded. Remove U2402, re-install Jump wire, and it can be used for a while, but it can’t be touched again. It seems that this is not the problem, but the display mirror.It is found that Inductor Capacitor under the display seat of J2019 has the phenomenon of tin emission.

iPhone 6 Plus Touch Failure repair Figure 2.

I called diode value to the ground, and it turned out to be Inductor Inveracious Soldering of the synchronous signal.

iPhone 6 Plus Touch Failure repair Figure 3.

iPhone 6 Plus Touch Failure repair Figure 4.

Hand solder,Diode value is normal.

iPhone 6 Plus Touch Failure repair Figure 5.

After the installation test, it did not appear again one day later.Ouno looks like it has many faults. It hits diode value, which shows BTB connector, and many of them don’t have diode value. Then, you can gently touch Inductor Capacitor under the microscope. It seems that Inveracious Soldering has a large area, and it is decisively disassembled and rewelded.

iPhone 6 Plus Touch Failure repair Figure 6.

iPhone 6 Plus Touch Failure repair Figure 7.

Installation test, everything is normal.It seems that the last use of SMD REWORK STATION blowing too long, resulting in the back of the sealant Inductor Capacitor Inveracious Soldering, this repair is over.