iPhone 4 Proximity Sensor Not Working After Screen Replacement Fix

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When you replace the screen on an iPhone 4 there is a chance the proximity sensor will not work properly once you install the new screen, particularly if it’s a different color screen.

The issue is specific to the iPhone 4 and not because of how the screen was replaced. One of the reasons may be caused by the foam that surrounds the ambient light sensor and proximity sensor.

Based on the photo above, the ambient light sensor is the one on the left, and the proximity sensor is the one on the right. The ambient light sensor is used to detect the light levels in your surrounding. The proximity sensor is what disables the screen when you put your phone close to your ear.

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Usually the foam will stick to the back of the broken screen, so once that’s removed the proximity sensor will not work properly as intended. Thankfully there are a few possible fixes to this annoying issue:

1. Full iOS restore – this is a software fix that works for some. Remember – do it safely to avoid losing your jailbreak and unlock.

2. Black marker pen – Use a permanent black marker and color the back side of the proximity sensor window on the iPhone 4 Screen. You may need to apply a few layers. This method works most of the time especially on the older iPhone 4 models.

3. Proximity sensor lens – This is a tiny lens that you place over the proximity sensor before you install a brand new screen. It looks like a contact lens that changes color according to the surrounding lights. We’ll make these available in our online store soon.

4. Foam – Try to replace the broken foam that was damaged during removal of your broken screen. Some people said using black electrical tape works for them.

What’s important is to have something in between the sensors to make sure they are not interfering with each other.

I hope these tips helped getting your proximity sensor working again!

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iPhone 4 Proximity Sensor Not Working After Screen Replacement Fix was last modified: July 23rd, 2019 by Joe Wang

Comments & Discussion

  1. I have had several issues as a repair shop dealing with broken screens. As a shop you want to make sure and always check to see if the proximity sensor is working before you replace the screen for any unnecessary hassle about replacing parts later. I have fixed a few with using the black sharpy method with success, but sometimes that just doesn't cut it. Another common issue besides the foam piece falling out or not being present is a small grommet that sticks to the back of the old screen. This needs to be replaced in many cases to prevent any light from entering and confusing the two sensors. It may also be an issue with your replacement screen as many replacement screens, especially the clear ones don't have the proper light blocking cover for the sensors.

  2. When will the lens be avaliebal from you? I have bought it from ebay now and tried to put it on a iphone but it didnt help, even when I tried to restore it!

  3. Nice info, i replaced a iphone4 screen as well and got the same problems. I replaced the sensor flex, Checked is the foam whsa still there and it was. I put an extra layer of electrical tape on it. All without result. Then i placed another screen from a working iphone4 and the problem was still there. The sensor is just not responding at all.

    Next option is a restore. This will be done tommorow. But i doubt this will do the trick. I havent tried the black marker trick. But i also doubt about this one. Because the phone didnt work with a good screen as well.

    Could there be something else causing these problems??

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