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Post originale di: Chris Halliwell ,


I would just like to add something as I have spent the best part of three days trying to sort through this one. I have tried all sorts of things from strips of insulating tape cut and placed over the sensor to colouring in the window on the glass. I couldn't work it out, each time I put the phone back together, the proximity sensor still didn't work.

Finally I worked it out and hopefully this will help other people as well.

We repair, refurbish and sell used iPhones [] and had come across this problem a few times in the early days of our business but recently, using better quality digitizers, we hadn't seen this for a while. I did however, as part of a promotional gimmick buy a pretty Blue front and back to customise a phone.

As I said, in the early days I had tried loads of different things, many suggested through this website and many others to try and work out this problem. Some say software issues, some say hardware. OK to clear this up, my logical guess it's a hardware problem that the software can't adjust to. It may well be that the clever software only works in a certain range, I'm not sure. What I do know is it's the sensor that can't cope with the variations on the different glass digitizer fronts. These vary from supplier to supplier, some work and some don't. During the many dismantling procedures in trying to get my customised blue phone to work, I tried one of my standard white digitizers and it worked perfectly so I knew it wasn't the sensor at fault. It's the quality of the window that lets Infrared light pass through it that can determine if it works or not.

Here is a simple diagram of how the sensor works:


The IR emitter sends out the signal and when you cheek or ear gets in the way it reflects back to the receiver and tells the screen to turn off.

I had tried all sorts and then I read an article about putting a little UV filter over the sensor and how it worked 100% so I decided to order one from eBay. When it arrived, it was much smaller than I imagined. When I looked closer, I realised this was already fitted to the iphone I was trying to get working. I had thought that I was buying some little add-on when in fact these are fitted in front of the receiver anyway. Now I really was confused.

Having stripped this phone down for the 6th time (the screws are starting to look a little worn out now), I though I'll stick this new little filter over the top of the old one. If this is what is recommended, I couldn't see that information clearly written down on any of the websites or anywhere on eBay where people are selling these. But as the phone was in bits, I thought I would try it. Below is some images to help understand what I am trying to explain.


As you can see from the pictures, it's quite small and only fits over the right bit of the sensor (which I assume is the receiver).

Top Left - Filter removed (This is standard as it leaves the factory)

Top Right - Filter fitted with extra filter to the right

Bottom Left - Filter

Bottom Right - Sensor with two filters fitted.

Bottom line is, this worked so now my iPhone with pretty blue front and back works as it should.