Repair guide: iPhone 6S won't wake up after standby
We received an iPhone 6S, the customer described the iPhone vibration and ringtones working properly. This means that the iPhone is turned on and does not display the iPhone LCD screen. The customer said that the iPhone was fixed in other places before, and after a few days of use, it was destroyed again, which is the same failure. How should we fix it?
We start to disassemble the iPhone, finding that the screws on the bottom are missing, after disassembling, the screws inside are also missing a lot. This is common failure on iPhone 6S, the repair idea is that the system signal interruption or the power supply and clock are unstable, and most commonly is iPhone display circuit problem.
Although there are many screws missing after disassemble the iPhone, but we don't found any repair trace of repairing. Considering this iPhone has a low chance of failure，so we start to repair from the simplest way, try to replace the iPhone display assembly. After replacement, test the iPhone for 2 days, it doesn't have any problems. However, after 2 days, test the iPhone again, the fault is back, seem the real problem is on the iPhone motherboard.
Take off the iPhone motherboard, put it under the Stereo Zoom Microscope to observe, we found the repair trace.
Looks the previously repair shop also repaired this circuit, use digital multimeter to measure the resistance value of displace interface, the problem was found quickly.
The data measured for 11 pin is 450, but the 9 pin is 390, it is obviously wrong. Measuring the other end of the inductor, the resistance is 390， until now we can confirm that the inductor is damaged or there is a virtual weld. Re-welding the inductor by using QUICK 861DW hot air rework station, and then measure the resistance for both pins, all is 390. Assemble the iPhone, and test it for few days, the iPhone 6S works properly, the problem of not waking up has been repaired!
If you have any methods or suggestions for solving this problem. Please contact us at www.vipfixphone.com.
We start to disassemble the iPhone, finding that the screws on the bottom are missing, after disassembling, the screws inside are also missing a lot. This is common failure on iPhone 6S, the repair idea is that the system signal interruption or the power supply and clock are unstable, and most commonly is iPhone display circuit problem.
Although there are many screws missing after disassemble the iPhone, but we don't found any repair trace of repairing. Considering this iPhone has a low chance of failure，so we start to repair from the simplest way, try to replace the iPhone display assembly. After replacement, test the iPhone for 2 days, it doesn't have any problems. However, after 2 days, test the iPhone again, the fault is back, seem the real problem is on the iPhone motherboard.
Take off the iPhone motherboard, put it under the Stereo Zoom Microscope to observe, we found the repair trace.
Looks the previously repair shop also repaired this circuit, use digital multimeter to measure the resistance value of displace interface, the problem was found quickly.
If you have any methods or suggestions for solving this problem. Please contact us at www.vipfixphone.com.
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