How to solve iPhone 7P charging problems and sounds problem

Actually, i am so sorry for the delay updating, the company organized a training for stuff, of course contains me. So i have to stop updated articles. But it is fine, i back now, next days, i will share more wonderful articles with you guys.

Today, we will talk about iPhone 7P charging and sounds problem, according to our customers said, he dropped this phone accidentally from the balcony, then when he is ready to reopen it, the faults occurred here.

Anyway, we need to diagnostic and do our best to fix it.

Firstly, we need to solve the charge problem cause if the phone can't run normal, the next steps will be much complex.

Plug the iPhone lightning cable, we confirm the iPhone 7P is not charging. Connect iPhone 7P to the computer, the computer also can't identified the device. Now, we confirmed that iPhone 7P charge problem is caused by iPhone USB charge IC.

Remove the USB charge IC from the iPhone motherboard, use digital multimeter to measure the grounding resistance value of the solder point on the solder pad, we found the resistance value of the C3 is infinitely large, and this signal point is connected to the main audio IC via resistor R3104.

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There are 3 kinds of possibilities for this case: first one is the resistor R3104 is damaged; second is the iPhone motherboard is pins dropped or disconnection; third is the iPhone audio IC is damaged. Remove the iPhone main audio IC, the pins is dropped, and circuit line is disconnected. Soldering jumper wire in this point, and replace the iPhone big audio IC. Now measure the resistance value of the USB IC C3 pin, the data is 480, which is normal value.

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Now the charging current is 1.13A, the charge function is normal. Because of the iPhone audio IC pins dropped and disconnection, after soldering the pins and replace the iPhone main audio IC, the iPhone audio function is back to normal, now we need to fix iPhone camera problem. Observe the iPhone camera, we found that was badly deformed. Replace the new iPhone camera, and then install the iPhone 7P, now the iPhone camera function is back to normal. The iPhone 7P was perfectly repaired.

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