iPhone 6s Plus water damage cannot be started for repair

iPhone 6s Plus water damage cannot be started for repair

Fault model: iPhone 6s Plus
Fault phenomenon: the water damage cannot be started
Maintenance process:
Today, we received a iPhone 6s Plus. The customer described that the mobile phone water damage could not be turned on. After detection, it was found that Connect the power supply short-circuit current 275ma can reach the current of switch and restart auto power off.

iPhone 6s Plus water damage can not be started repair Figure 1.

Look at the current should be able to display the right ah, why not display, carefully observe the light is no backlight.

iPhone 6s Plus water damage cannot be started for repair Figure 2.

If you look at the backlight chip, there are traces of water damage corrode. Then blow down the backlight chip on the right. It is found that there are many tin beads on PAD by corrode. After soldering the optical chip again,Connect the power supply,short-circuit current is smaller, only 90 ma. The logo can be displayed normally when the power is turned on. However, when the current reaches 500 hundred, it will restart.

iPhone 6s Plus water damage cannot be started for repair Figure 3.

So I continued to find the place where corrode was located. First, the Capacitor of many main VCC and corrode was deducted. The current of short-circuit current was getting smaller and smaller. There were more than 50 Ma short-circuit current. Finally, it was found that the corrode on the side of the USB chip was also serious, so the USB chip was removed. Sure enough, the tin beads under PAD were also replaced by the USB chip.

iPhone 6s Plus water damage can not be started repair Figure 4.

Once again, Connect the power supply has no short-circuit current, the power on is normal, and the system test function is normal. At this point,iPhone 6s Plus water damage cannot be started, and the fault is repaired.