IPhone5S Charge heating battery is not durable


In our daily life, often encounter mobile phone charging fever, and battery power is very fast, so that we go out to bring a lot of inconvenience, as I share some of the maintenance experience in this area。

Steps：

Plug the charger to charge for half an hour, finding that the iPhone is very hot and the temperature is nearly 70℃. Turn if off at once and tear it down to test.

First, replace the Tail Plug Flex Cable, but the problem is still the same. Tear down the motherboard and measure each relevant circuit. Measure the diode data to ground of each pin, such as charging tube Q2, USB Control chip U2 and USB interface J7. We find that diode data to ground of pin 26th of USB interface J7 is abnormal which is larger than the normal one 20. The location of pin 26th of USB interface J7 in bitmap is shown in picture 5-36.

Picture 5-36

After analyzing the circuit diagram, we know that pin 26th is connected to USB management chip U2. So replace U2 chip and turn on to test. But the problem is still the same. Then we continue to check the rest circuits. Remove Q2 and short connect the D pole and S pole on solder pad, as shown in picture 5-37. The location of Q2 is shown in picture 5-38.

Picture 5-37

Picture 5-38

Recharge it and test. IPhone is no longer hot and trouble is removed.

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