iPhone 7 mobile phone water damage can not start repair

Machine Model: iPhone 7
Fault phenomenon: mobile phone water damage cannot be turned on

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 1.

Maintenance process:Connect the power supply does not have short-circuit current,switch jumps directly more than 200, this kind of fault is generally caused by VCC Short circuit.

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 2.

Take a look directly at the dozens of VCC s output by the main power supply.

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 3.

After testing these VCC s, you can basically determine where Short circuit is causing them.

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 4.

When the PP3V0_TRISTAR_ANT_PROX signal was detected, it was found that Short circuit was already present.

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 5.

Take a look at the signal to these places, and also to the USB.

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 6.

Take the USB directly, then Measuring diode value is still Short circuit, and continue to check the appearance of the motherboard.

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 7.

When I saw this, I found that a chip has been damaged. It is very likely that this chip caused the PP3V0_TRISTAR_ANT_PROX Short circuit.

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 8.

After dismantling the Inductor, I found that the PP3V0_TRISTAR_ANT_PROX diode value has returned to normal.

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 9.

Reinstall the USB you just removed.

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 10.

At this time,switch is normal.

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 11.

When switch is turned on, it is found that Stop at and Stuck on Apple logo cannot enter the system.

iPhone 7 mobile phone water damage cannot be turned on for maintenance Figure 12.
switch dropped to 200 after 2A, and it stopped moving.fingerprint has also been buckled. Now it is suspected that the problem of coder will cause the current to be normal, but the or so will not move if it drops 200.