After iPhone 7 Plus dropped, the iPhone can't take photos, no sound on the headset and no charge after dropped.
Repair Process
After received the iPhone 7 Plus, it seems to have a lot of issues, but we need to examine it progressively.
First we need to solve iPhone charging issues. When use charging cable to charge iPhone 7 Plus, it really on no charge status. Connect iPhone to computer, finding that the computer can't identify the iPhone. Based on these phenomena, we can basically confirm that it is caused by iPhone USB control IC.
Disassemble the iPhone USB control IC from iPhone motherboard, and then measure the diode data of iPhone solder joints on solder pad with Fluke 15B+ Digital Multimeter, finding that the diode data of iPhone USB IC C3 pin is infinitely large. This signal point is connected to iPhone main audio IC by through resistor R3104.
There are three reasons can cause this case, one is resistor R3104 is damaged; the second one is the iPhone motherboard dropped pins and disconnection; the third one is iPhone big audio IC is damaged.
Remove the iPhone main audio IC and check it under the Phone repair 7-45X Trinocular Stereo Microscope, there's a pins dropped and disconnect. Fix the jump wire of the pin, and replace the iPhone big audio IC. Now measure the diode data of USB IC C3 pin again, the data is 480, and it’s normal data.
Re-install the USB control IC, insert the charger, now the charge current is 1.13A, the charge function is normal.
Because audio dropped pin and disconnection, after fix the pins and replace iPhone big audio IC, the iPhone audio back to normal work, now we need to fix iPhone camera issue.
Because the iPhone was dropped before, observe the iPhone, we found the iPhone rear camera badly deformed, directly replace the new iPhone rear camera, the iPhone won't take photos issues has been solved.
The iPhone 7 Plus has been perfectly repaired!
Repair Process
After received the iPhone 7 Plus, it seems to have a lot of issues, but we need to examine it progressively.
First we need to solve iPhone charging issues. When use charging cable to charge iPhone 7 Plus, it really on no charge status. Connect iPhone to computer, finding that the computer can't identify the iPhone. Based on these phenomena, we can basically confirm that it is caused by iPhone USB control IC.
Disassemble the iPhone USB control IC from iPhone motherboard, and then measure the diode data of iPhone solder joints on solder pad with Fluke 15B+ Digital Multimeter, finding that the diode data of iPhone USB IC C3 pin is infinitely large. This signal point is connected to iPhone main audio IC by through resistor R3104.
There are three reasons can cause this case, one is resistor R3104 is damaged; the second one is the iPhone motherboard dropped pins and disconnection; the third one is iPhone big audio IC is damaged.
Remove the iPhone main audio IC and check it under the Phone repair 7-45X Trinocular Stereo Microscope, there's a pins dropped and disconnect. Fix the jump wire of the pin, and replace the iPhone big audio IC. Now measure the diode data of USB IC C3 pin again, the data is 480, and it’s normal data.
Re-install the USB control IC, insert the charger, now the charge current is 1.13A, the charge function is normal.
Because audio dropped pin and disconnection, after fix the pins and replace iPhone big audio IC, the iPhone audio back to normal work, now we need to fix iPhone camera issue.
Because the iPhone was dropped before, observe the iPhone, we found the iPhone rear camera badly deformed, directly replace the new iPhone rear camera, the iPhone won't take photos issues has been solved.
The iPhone 7 Plus has been perfectly repaired!
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