Fourth generation iPhone. Repair is straightforward, but the front glass and LCD must be replaced as a unit. GSM / 8, 16, or 32 GB capacity / Model A1332 / Black and White.

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Is the iPhone 4 proximity sensor issue solved by replacing the sensor?

Is the well known iPhone 4 proximity sensor issue (unlocking/touching/speaker when calling) solved by replacing the sensor? Or is it a design issue that can't be fixed?

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have you changed the fascia to white?

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No, just a regular black model.

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In your specific situation Thomas, make sure you have updated your phone's software. Apple's response to the issue was that the problem was related to the software which was addressed in an iOS update back in November of 2010:

http://www.macrumors.com/2010/07/16/prox...

That update seemed to have fixed the majority of the problems and user feedback claiming there are still issues has been minimal.

If you are running the latest software, it sounds like the sensor itself may be faulty. The phone is probably still under warranty so I would take it to an Apple store if you can and get it looked at. If you are wanting to replace the sensor yourself, it is located on the power and sensor cable which also contain the ambient light sensor and the 2nd microphone used for noise cancelling. iFixit does sell the part for the GSM/AT&T model and we are sourcing the part for the CDMA/Verizon model:

iPhone 4 Power and Sensor Cable (GSM/AT&T)

The following info doesn't sound like it applies to you, Thomas, but it may apply to others:

As pollytintop alluded too, there have been issues reported when trying to replace your front panel on the iPhone 4 and when changing the panel to a white panel from a black panel. The newly released white iPhone 4 has a black oval shaped window over the proximity and light sensor:

http://www.macrumors.com/2011/05/04/orig...

If you had a black iPhone originally and then swapped out the front panel with a white one, you probably ended up with a panel that had a window with a bunch of small holes that sat over the proximity sensor. Both the panel with the window with the small holes and the newer panel with the black oval window will work with that iPhone.

If you bought a white iPhone when they came out officially in April of 2011, you must replace the front panel with a panel that has the black oval window. The older front panel that had a window with the small holes will not work properly in the newly released white iPhones.

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Hi Scott,

Thanks for the info. I am indeed running the latest software. I also asked a couple of friends and they don't seem to have as much problems with it as I do.

Since this problem is kind of hard to prove by filling in a form and there are no official Apple Stores in Holland (only Premium Resellers), I will consider replacing the sensor cable.

Thanks.

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Just a quick update (on this old post): I did replace it with the sensor cable of a friends defective iPhone (the sensor cable was still good), and it definitely made a difference! I was able to make calls again by holding the phone with my shoulder, like I was used to on my 3GS! My iPhone 4S does not suffer from the issue (and also has better reception and less antenna gate signal drop, almost none actually!)

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I had this issue as well. I recently swapped mid frames and glass on my AT&T iPhone 4. I swapped from black to white glass. My new glass came with the sensor "fix" sticker already attached, it didn't have little holes but one large window (the newer design). I replaced the sensor cable and still had the issue. I even saw that they were selling the sensor cable fix stickers online and I replicated it with some electrical tape and stuck it onto the frame of the phone over the sensors, cutting very small holes for the sensors to be restricted as to the amount of light they were putting out. That didn't work either. What DID work, however, was looking at my old frame, and finding a strip of foam running between the two sensors. I removed that strip and placed it on top of 2 strips of tape on the new frame, between the two sensors, to ensure it was thick enough to hit the new glass. It worked like a charm! What it is is light bleeding over from one sensor to the next by reflecting off the front glass into the other sensor. If you have a black piece of foam tape, you can cut a small strip to run between the two sensors. It needs to be thick enough so that when you place the glass back onto the frame, the foam touches the glass and separates the light from the two sensors completely! Hope this helps!

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hi all,

i know that this is a rather old issue and all the fixes except gasket didn't work for me sharpie etc. and i bet that gasket wouldnt work if i tried it. Anyway here is my story i changed my screen multiple times with ifixit ones and chinese ones and with that screens proximity wasn't an issue for me but one day my power button stopped working and i had to change my proximity sensor ribbon. And after that i was never able to make my proxity sensor work again.

a few days ago i decided to think about this issue again i bought a few more proximity sensors and put them to my screen but none of them worked. So i tried all of the sensors without putting it to the phone case and wow i realized that all of them working outside the case with the direct light. So all of the theories in here assuming that your proximity sensors are not working because it is absorbing so much light into it. But my expirement proved that it is completely wrong.

anyone in here can try proximity sensor without putting it inside the case. So according to this can anyone explain why this proximity sensor is not working?

Thanks...

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See my post below about my post above. The foam is / was NESSESSARY. I know it seems unlikely but it worked immediently when everything else failed (gasket and sharipe both)

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I'm getting this same issue. I have a white iPhone and I've only replaced the screen. The proximity sensor doesn't work anymore but when it is out of the frame it works fine. Does anyone know why this is happening? I've tried the sharpie, there was a foam pad already around the front of the frame. I've put electrical tape too and it's not seeming like it's working.

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I have a similar problem:

I bought months ago a white screen (with "oval window") to convert my black iPhone 4 into white, and then the proximity sensor worked fine.

Now, I have another iPhone 4 White (Original White, I mean) with the glass broken. I bought the same replacement part, but now the proximity sensor is not working.

Why is this happening? Are they using another kind of flex in iPhone white?

How can I solve this or where I can buy a compatible iPhone White replacement screen?

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keep looking on ifixit..there are people who solved the problem by colouring over the sensor etc...just browse under iphone photo or via search bar at top of page, also try white conversion as a search

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@freerefil: Maybe the sensor was positioned closer to the glass (and thus less light leaking) when I replaced it as described above...

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i don't think is the same problem of white conversion.. because I don't have any problem when I convert from black to white..

The problem is when i change the broken glass of an original IPhone white.

I alredy searched but I found nothing.. :S

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i don't think it has much to do with that either..but the solutions are worth a try. The problem is the glass..whether it's a conversion or not. try this answer and link.White Conversion Proximity Sensor on 4.2.1. not working - Help

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This is weird because I have made a lot of conversions (around 50) and I only have had the problem with the original white (around 5)

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The proximity sensors on the white iPhone 4s are different (or at least behave differently) than the sensors on their black counterparts.

The reason that I know this is that I had a white one. I quickly installed it in an Otter Box. The proximity sensor was intermitant at best. I called Otter Box and was told that this was a known issue with the white iPhone 4s and that my best bet if I wanted to use eir product was to get a black phone. That's just what I did and it worked out great.

Good luck.

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My wife has replaced her Black iPhone 4 3 times so far and each time she has had an issue with her proximity sensor. At first I thought it may have been something she was doing until it started happening right in front of my eyes. Her latest exchange just did it today in fact. Phone was stuck to her cheek and all of the sudden she muted her Father twice. We have no idea what it is. I'm beginning to think that's it's just a faulty hardware part on the iPhone 4 since lots of people have had the problem. My buddies iPhone 4's (multiple) had the problem as well. Went away when he got the 4s. Oh and she has always had the latest updates. The worst part is, the employees at the Apple Stories are either oblivious to the proximity sensor issues OR act like they know nothing of it. At this point she's going to live with it until the next iPhone comes out.

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I had an Iphone 3G for over 2 years without a problem and upgraded to Iphone 4 and had constant problems with the proximity sensor - muting callers, putting them on speaker and even worse, adding callers on Facetime while on a call. The phone was replaced and the same problems occurred. Today I have changed phone carrier and got an Iphone 4S and guess what? The same problem. Three lots of muting and Facetime calling in a short phone call. I have used the same case for all of these phones. Is it time to give up on Iphones or can they fix these problems? If I hadn't had the 3G version for so long, I might have thought I was doing something to cause the problem. Obviously, the software was up to date in all of these phones.

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I noticed that Siri (raise and speak) worked fine until I put my protective case on the phone. Although the phone case has cut-outs for the sensor, Siri would not work with the case. I trimmed some of the case next to the sensor and now it works fine. Obviously the sensor has a broad view and must have a larger opening (than my case had) to see through. If you have added any type of case to your phone, trying taking it off and see if Siri works without it.

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freerefil, this works!

The separator between the 2 sensors is the only thing that has actually worked. The key is for it to be thick, like you said. Thick enough to have it press back against the front LCD.

Proximity Sensor Fixed!:

- Date: 8-31-12 - 3:30 AM EDT

- How: 3 layers of foam making a divider between the ALS (Ambient Light Sensor - left) and PS (Proximity Sensor - right). If using electrical tape, you probably need more.

It needs to be THICKER than what it shown in this picture - http://www.beijingiphonerepair.com/wp-co...

It needs to show that it presses back a little bit when you put the LCD on (before screwing it on)

- Specifically what I used: (in case any details matters. I dont think so, as I believe its only the thickness of the center divider that matters)

Got this - http://www.ebay.com/itm/271022014327?ssP...

(these can also be found elsewhere like there - http://pacifictoy.com/index.php?dispatch...)

1. Cut a piece on the side the form a strip, just slightly longer than the center area btwn the sensors. Placed that in the center

2. Used one of these cut out / stickers and placed that on top

3. Cut another piece like from step 1, and placed that on top.

This was the right amount of thickness, and now my proximity sensor work from like 1 inch away :D

I have tried EVERY SOLUTION under the Sun, on every forum. This is the ONLY thing that actually worked.

Attempts included:

- Sharpie (multiple layers)

- Blocking the sensors

- Foam / electrical tape around the sensors

- Tape w/ sharpie

- Replacing the prox sensor (done at a repair shop)

- Different LCD

- I even ordered that little "proximity sensor lens" screen thing

- Even tried this ALS jailbreak app to adjust the ALS (Ambient Light Sensor)

NONE of them worked.

I got a very very very subtle working (but not good enough) when surrounding it with the black foam. But that is because it was like a small divider (but too small to take effect).

And with Dialer-Shield not updated for iOS 5, I have been struggling with this for a while since I had to replace my LCD (after hitting a parking lot face down)

I dont know why the foam divider is needed, and why it has to be thick, but perhaps you are right - the sensors are confusing each other.

I dont think it is the backlight though from the LCD. I have Dimmer (a jailbreak app), and I an almost fully turn the backlight down so low that the screen looks off - and yet the prox sensor still failed to function. I think it may be how one of them (or both works) - possible some kind of IR? (idk I am not an electrical engineer), and due to that signal, one of them was seeing it and saying "no, not turning off the screen, because the darkness condition has not been met (even if pitch black). So my theory is the separate is truly keeping them separate. I’m not sure why or even how the signal was reflecting, but however they were built to work by Apple, they were meant to be separated (would have probably been better if physically separated by more distance, so this crap doesn't happen to people).

So I must say THANK YOU for this. You saved my sanity and my phone. I really do appreciate it.

Everyone with a broken proximity sensor, needs to try this.

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thank you so much appexe! the foam helped!

I did try for two hours now with tape etc.

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freerefil, appexe, thank you, just added a divider made of a 2mm sticky foam and it worked!!

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I have to add this sht works when all else failed. The UX lens thing, the sharpie thing, even the foam gasket off eBay all failed on two original white iPhone 4 devices. But stacking TWO foam gaskets on top of each other did the trick. Thanks man for the post!

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The gasket nor sharpie worked for me. It seems to need the divider / pressure, with the foam I described above.

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yes that makes sense the problem is not about light issue i think or at least for some of us the problem is the distance between the proximity sensor and the phone screen.

Anyone who says that this is because of light can try to make proximity sensor work out side the case in a bright room.

Thanks again.

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Any luck with this?

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i ordered foam from china i hope within a month i'll get them. actually i could find a foam and shape it according to proximity sensor but i am tired of assembling and disassembling of iphone. So i am waiting for the parts...

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Let me know :-)

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hi again,

finally i solved the issue. Without any foams, uv filters or something. The problem occours when the distance between front glass screen and the metal frame is so close. So in this condition probably proximity sensor (which is a kind of infrared receiver) acts as there is an object so close to the sensor. so in this case phone software probably disables proximity sensor not to block phone usage.

So one solution for this is to increase distance between ir sensor and the screen by putting foam, or 4 - 5 layers of very thin electrical tape. In my case i ordered foam stuff from china but i couldnt wait chinese parts to come. So i cut very tiny pieces of electrical black tape with 1 - 2 mm wide 1 cm in length. and put nearly five layers of it over the metal chasis between proximity sensor and light sensor. And finally it works.

So the problem is not about the light, i proved that ir sensor works out side the case under room light. The problem is front glass some how gets closer to the chassis.

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can i know?have any file make proximity sensor not function?

for information,my iphone4 running on ios7 and all function working perfectly,and then after jailbreak,proximity sensor not function like before.so,using iFile,can i fix it with deleting some file to make the sensor working perfectly again?

if it true the problem was happen because jailbreak,what the name of file must to deleting?

can give step by step to delete that file?

tq.

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can i know?have any file make proximity sensor not function?

for information,my iphone4 running on ios7 and all function working perfectly,and then after jailbreak,proximity sensor not function like before.so,using iFile,can i fix it with deleting some file to make the sensor working perfectly again?

if it true the problem was happen because jailbreak,what the name of file must to deleting?

can give step by step to delete that file?

tq.

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Thomas de Leeuw will be eternally grateful.
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