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iPhone 4 Proximity Sensor Not Working

After replacing the iPhone 4 LCD Screen, the Light Proximity Sensor does not work properly. Changed a new Sensor Flex Cable, but it still does not work. The iPhone 4 Proximity Sensor Not Working problem is very common after repairing the screen for iPhone 4 and iPhone 4S.

What caused this problem? The real reason is the front glass of the iPhone 4 does not produced very well. You can clearly see 2 blue holes on the middle top of the glass through light. The 2 holes receive light and sensor from outside,if the holes are not produced very well by factory,it will cause sensor not responding.

In China, most suppliers are selling copy glass with OEM LCD, the glass is not OEM, some poor quality glass will cause iPhone 4 Proximity Sensor Not Working. (No suppliers test the sensor function)

To resolve iPhone 4 Proximity Sensor Not Working problem, we find 2 solutions. You can try the first one which is easier. However, if the first solution is not helpful, you should try the second one which is more effective.

First Solution :

iPhone 4 Proximity sensor not working after screen replaced First Solution to iPhone 4 sensor not working problem

Tear down the iPhone 4 LCD Screen, in the front view, find the sensor cable, try to use the black ink pen or marker to blacken the left sensor. This will resolve your iPhone 4 Proximity Sensor Not Working problem. However, this method is not 100% effective, it only can solve some people's phone. If your problem was still not resolved, please check below second method.

Second Solution :
Step one - Use a knife to cut a piece of black insulation tape, then cut 2 small holes on the tape (Please make sure the 2 holes can fit the sensor well,and the tape must be black)

Step two - Cover the tape you just cut on the sensor flex cable. Make the tape well covering.

Second solution to iPhone 4 Proximity sensor not working Second solution to iPhone 4 Proximity sensor not working -Step Two

Step Three - Just install the screen back on, and test the sensor function.

iPhone 4 Light proximity sensor not work Second Solution to iPhone 4 Proximity sensor not working-Step Three

The Second Solution is always very effective. It can resolve your iPhone 4 Proximity Sensor Not Working problem perfectly. Regarding iPhone 4S sensor problem, it is about the same, you can buy a UV foam and paste it on the sensor.

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