Fix iPhone 6 Overheat Issue after Water Damaged

Won't turn on when iPhone 6 is damaged by water. After fixing the startup failure, a new problem was discovered. After a period of use, the iPhone 6 overheats and the iPhone battery is almost drained. Is this abnormal? Next, phonefix will share some repair tips for you.

Taking apart the iPhone 6, we see that the iPhone waterproof sticker has changed color, because the normal sticker is white, and this sticker is red.

Connect the iPhone motherboard to the DC power supply, and a large current is displayed, indicating that the iPhone standby circuit voltage is short-circuited. Measured with a digital multimeter and found that the PP_VCC_MIAN voltage is short-circuited.

Putting the iPhone motherboard under a microscope to observe, we found that the capacitor C5202_RF next to the iPhone WIFI IC has turned black, and the tis on the capacitor has fallen off.

Use Quick 861DW hot air rework station to remove C5202_RF, and then measure PP_VCC_MAIN, the voltage is normal.


After assembling the iPhone 6 and turning it on, the iPhone can enter the system, and it seems that the iPhone 6 has returned to normal. However, after a period of use, the iPhone 6 overheats and the iPhone battery drains quickly, which is an abnormal phenomenon.

Now we need to test the various functions on the iPhone 6, the abnormal function module will cause this problem. After testing, we found that the iPhone compass function is abnormal, because everything we turn on the iPhone compass function needs to be calibrated.

Moreover, after calibration, the orientation displayed by the compass is also abnormal.

We also tested the gravity sensor function, it is normal.

Based on the above test results, we concluded that the problem that caused the iPhone to overheat and drain quickly occurred on the compass circuit.

Disassemble the iPhone 6, remove the iPhone motherboard, measure the compass power supply with a digital multimeter, and find that the PP3V0_IMU voltage is short-circuited.

Log in to ZXW Dongle to view the schematic diagram of iPhone 6. It can be seen that PP3V0_IMU is output by iPhone power IC, and directly supplied to iPhone compass IC U1901 after filtering capacitor C1902.

So the PP3V0_IMU voltage short circuit problem is related to iPhone power IC, C1902 and iPhone compass IC.

First use Phonefix 861DW hot air rework station to remove C1902, and then use a digital multimeter to measure the diode data of PP3V0_IMU, the measured data is 455, which is normal.

Install the new C1902 and then assemble the iPhone 6. Powered on, used the iPhone 6 for a while, everything worked fine, the iPhone 6 didn't overheat, and the iPhone compass functioned fine.


The above are some repair tips for iPhone 6 overheating after being damaged by water, I hope it will help you. If you want to know more about iPhone repair, please leave a message in the comment area.


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