Repair Guide: iPhone 6 no display after replacing battery
We received an iPhone 6 and the phone screen was not displayed after the customer replaced the iPhone battery. Although connected to the computer, the phone can be recognized. The iPhone 6 works fine, but the screen does not display.
The iPhone 6 works normally after replacing the battery, but the iPhone no display when it is turned on after battery replacement, this failure is generally due to the customer accidentally installed the long screws to the position of the short screws, and then the circuits under the screw was punctured.
First of all ,we need to disassemble the iPhone, and take out the iPhone motherboard. Measure the resistance value to grounding for display socket J2019 with Fluke 15B+ Digital Multimeter, we find the resistance value to grounding for 14 pin AP_TO_LCM_RESET_CONN_L is infinitely large, which is clearly disconnected.
There is the trace of a breakdown for left screw column BS2502 after observing it under the HDMI Camera Stereo Zoom Microscope, scrap it and re-connect the disconnection. Measure the resistance value to grounding for display socket J2019 14 pin AP_TO_LCM_RESET_CONN_L with multimeter, the data is normal.As shown in picture.
So, install the iPhone and test it, we find the iPhone volume button not working, and the WIFI cannot be recognized.
Measure the resistance value to grounding for iPhone volume button socket J0802, it is infinitely large, and perhaps it is disconnection. This circuit line is on the third floor of the left screw column that near the edge position, carefully scrape it and then re-connect it.
There are 2 reasons causes the WIFI cannot be recognized, one is the iPhone motherboard disconnection, and the other one is iPhone WIFI module IC problem. Remove the iPhone WIFI module IC and measure the resistance value to grounding for solder pad, no abnormal was found. Replace the new iPhone WIFI module IC, install iPhone and test it.
The iPhone volume button and WIFI are back to normal. The repairs end!
If you have any other problems for the mobile phone repair, please contact China Phonefix Shop Team on www.vipfixphone.com.
The iPhone 6 works normally after replacing the battery, but the iPhone no display when it is turned on after battery replacement, this failure is generally due to the customer accidentally installed the long screws to the position of the short screws, and then the circuits under the screw was punctured.
First of all ,we need to disassemble the iPhone, and take out the iPhone motherboard. Measure the resistance value to grounding for display socket J2019 with Fluke 15B+ Digital Multimeter, we find the resistance value to grounding for 14 pin AP_TO_LCM_RESET_CONN_L is infinitely large, which is clearly disconnected.
There is the trace of a breakdown for left screw column BS2502 after observing it under the HDMI Camera Stereo Zoom Microscope, scrap it and re-connect the disconnection. Measure the resistance value to grounding for display socket J2019 14 pin AP_TO_LCM_RESET_CONN_L with multimeter, the data is normal.As shown in picture.
So, install the iPhone and test it, we find the iPhone volume button not working, and the WIFI cannot be recognized.
Measure the resistance value to grounding for iPhone volume button socket J0802, it is infinitely large, and perhaps it is disconnection. This circuit line is on the third floor of the left screw column that near the edge position, carefully scrape it and then re-connect it.
There are 2 reasons causes the WIFI cannot be recognized, one is the iPhone motherboard disconnection, and the other one is iPhone WIFI module IC problem. Remove the iPhone WIFI module IC and measure the resistance value to grounding for solder pad, no abnormal was found. Replace the new iPhone WIFI module IC, install iPhone and test it.
The iPhone volume button and WIFI are back to normal. The repairs end!
If you have any other problems for the mobile phone repair, please contact China Phonefix Shop Team on www.vipfixphone.com.
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