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Proximity sensor not working after display replacement

I had a broken screen so I ordered a new display with home button, front camera and proximity sensor already assembled in the display frame.

I replaced the display and all works fine except the proximity sensor. Actually, if I press my thumb hard against the proximity sensor area, it works after a 2 seconds lag or so.

What can be the cause and how to fix? My iPhone 5 if black.

Thank you

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Sometimes the quality of the glass on the replacement screen can play a role in how well the proximity sensor works. More specifically, it has to do with how dark or light the class is where the light is designed to come through just to the left of the ear speaker hole. In your case, it sounds like too much light is getting through, so perhaps the glass is not dark enough there. Coloring the glass with a layer of Sharpie ink will often fix things if this is the issue.

If that's not the issue, then it may be a problem with how they installed the bracket that holds the proximity sensor in place. If the bracket is out of place or even missing, then the sensor may be too far away from the glass and too much light may be getting into the area around the sensor.

Checking either of these things would involve taking the screen off again and disassembling the front camera/sensor flex cable area.

Of course, it is very possible you just got a faulty proximity sensor. In that case, I would just replace it with the the one from your broken screen.

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Awesome answer, thank you, even though it looks like a lot of job for an amateur that is afraid to break things. Thanks!

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If I clue a dark tape on the top of the screen, with proper holes for the speaker camera and proximity sensor, could that work?

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That wouldn't be an ideal solution, but it very well might work, yes. The tape would need to be translucent...perhaps some packing tape that has been colored over with a layer or two of Sharpie ink.

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Thanks a lot sir, i purchased an after market display and there is the same issue for proximity.i decided to fully clear the blue coating above sensor on the display, but the sensor even shows a proximity of 1 cm (constantly), i was soo confused. After going through various threads on the internet, i saw this one and on applying a light diluted water marker ink(Blue color) as trial, the senor starts working for real.

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