How to repair iPhone 7 Plus will not charge and no sound
We received an iPhone 7Plus, the iPhone 7Plus malfunction is very strange, the customer said it can not be charged and there is no sound. After communicating with the customer, he accidentally dropped the iPhone 7 Plus to the ground, and then the iPhone camera would not take a picture. The iPhone had no sound and the iPhone was not charging.
After receiving the iPhone, it has a lot of problems, but we need to fix it one by one. First we need to solve the iPhone charging problem. Plug in the iPhone lightning protection cable, we confirmed that the iPhone 7P is not charging. Connect the iPhone 7P to your computer and the computer will not recognize the device. Now, we confirm that the iPhone 7P charging problem is caused by the iPhone USB charging 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.
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.
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.
If you can not understand the above steps, please contact me on www.vipprogrammer.com
After receiving the iPhone, it has a lot of problems, but we need to fix it one by one. First we need to solve the iPhone charging problem. Plug in the iPhone lightning protection cable, we confirmed that the iPhone 7P is not charging. Connect the iPhone 7P to your computer and the computer will not recognize the device. Now, we confirm that the iPhone 7P charging problem is caused by the iPhone USB charging 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.
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.
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.
If you can not understand the above steps, please contact me on www.vipprogrammer.com
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