Iffy Proximity Sensor

bert682 said:

Hi All

Picked up a Nexus 4 a few days ago and only just noticed (as result of a call) that the proximity sensor is reporting that its "blocked" at all times, so the phone things its against my head. I can workaround this by using the "Power button to hang Up" option but at present cannot access any in call features.

When I look under good light the sensor, there are 2 areas so not sure which is the sensor, I can see what looks like a bubble under both. if you imagine what an air pocket looks like under a screen protector thats what it looks like but its behind the glass, perfectly centred. I guess its possible that something has broken here as a result of the drop, the top left corner was the point of impact, does that seem likely?

I got the phone cheap as it had a broke screen so have a new one coming. Its the full screen, glass and digitizer. Does anyone know of the sensor is part of the screen or does it sit behind and then I could be really screwed!

Ta

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Sp_Ark said:

Search for proximity sensor fix after screen replacement here on xda. I've found out that if you switch sides of the little rubber /plastic cover that covers the proximity sensor, your problem will be solved. And the light sensor will work with no problems as well.

Sent from my Nexus 4 using Tapatalk

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Planterz said:

Yep, I discovered this "fix" in a random youtube comment (was that you @Sp_Ark?) just a few days ago, and it worked for me. Then I found a thread here that confirmed that this could be a solution (which could have saved me a week of frustration).

If there's actually something on the proximity sensor, then you might be screwed. Well, not really, or $10 from China. The module is a snap-in piece with connector ribbon that also has the headphone jack. The prox sensor is the smaller one on the right side (when looking at the screen).

Disassembly of the Nexus 4 is pretty simple compared to many other smartphones. You'll need a T5 TORX wrench/bit for the screws at the bottom, and a very small Phillips driver for all the screws in the inside. You'll also need a tool to split the 2 halves apart (your screen replacement might have come with tools). You can find a couple videos on youtube, as well as a detailed teardown (pics) at ifixit.com. If you have a hairdryer (or an actual heat gun) you can make the process easier by softening the glue with heat, but it's not absolutely necessary. Just go slowly and be careful when prying the halves apart so you don't flex it too much and break the glass back.

Which screen assembly did you get? You can get it where it's just the LCD and the digitizer, and you can also get it that has the bezel and speaker with it. When I replaced the screen on my N4, I got the whole deal with the bezel and speaker, since it meant less work and fewer things to screw up.

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Planterz said:

You made a wise choice, young padawan.

Yeah, that looks to be the entire front assembly, including the screen+digitizer, already installed in the bezel. Also includes the earpiece plus the speaker grill that you're missing. You'll have to swap over the guts, and that's about it. It's easiest to swap the power and volume rocker buttons first since it's a bit harder to get them where they go if you've got the logic board in the way. Just remember that the contact points need to make a ^ rather than a v when you're assembling it with the screen facing down. Tweezers are good to have, especially if they're very long and even better if they're curved. I also recommend doing this over a clean towel to avoid scratching the screen (there'll probably be a film over it too), and the fluffier the towel the better, to catch the tiny screws from flying and disappearing.

Honestly, getting the 2 halves apart is probably the hardest part. They make specialized tools for this, and often the sellers will include them, but it doesn't look like your purchase includes them (mine didn't either). Something plastic is the best choice, since you're less likely to cause cosmetic damage to the plastic (especially the bezel) if you slip (and you will slip). As I said before, GO SLOWLY. Work it apart a little bit at a time, alternate side to side, starting from the bottom. Eventually you'll be able to pull the 2 halves apart.

The battery will be stuck in pretty good and will need to be pried out. If I were you (and a week or so ago, I was you, I'd pop a new battery in while you're at it. At this point in the phone's life, it's probably had at least a few hundred cycles on the battery and has lost 10-20% of its original capacity. The other comments shouldn't be nearly as hard to get out. Just pry in various points until the piece pops out. Do not force anything. Just work it out slowly. After you pop off the piece that covers the USB port, there's the board that has the port, and that can be slightly tricky to get out. Best way I found is to slip something small and flat (screwdriver?) into the port and push up and out, and the board should come out easily.

Thankfully, there's only 3 different screws used, and they're all easily differentiated from each other. There's the 2 T5 TORX that hold the halves together, the 2 very short screws with wide heads that hold the battery in place, and the rest that hold everything else are all identical to each other.

It looks like on your assembly, it comes with its own adhesives. Everywhere there's a blue film, pull it off and there'll be adhesive underneath. I'd recommend leaving the film on over the part where the sensor/headphone jack module goes until you're sure you can stick it in place with the proximity sensor not acting wonky. Download an app (I used Phone Tester) that can read the prox sensor. FYI, as long as everything is in place, and you've attached the battery, you can boot the phone without replacing the back cover, and test the sensor (just depress the center bit of the power button board). You don't need to screw everything in, but you should at least screw and tighten down the few that surround the sensor area. Once you've got it reading properly (best of luck), it's time to put all back together.

You should familiarize yourself with the teardown/reassembly guides out there. Go to ifixit.com and have everything ready to look at. This is the video[/i] that I used to guide me, and I watched it through a few times before I attempted it myself. You should be just fine with your phone after familiarizing yourself, but if you have any specific problems or questions, feel free to ask, and I'm all too happy to help.

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Sp_Ark said:

If you want to have a working battery like it used to be before removing it, you have to be very patient and extra careful while trying to remove it. Use some heat for the glue and try with something very thin like a nylon guitar pick. In anyway don't bent the battery and don't start from top. It will be easier to first remove the mother board. Iv already destroyed 4 5 batteries while trying to remove them. Sorry for my English, I hope you understand.

Sent from my Nexus 4 using Tapatalk

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Planterz said:

Awesome! See, it wasn't too bad, was it? Ifixit gives the N4 a 7/10 for repairability, and that's pretty high for them. After replacing my N4 screen, friend/coworker asked if I could do the same for his HTC One M7 with a completely shattered, yet functional digitizer. I said "HEEEEEEEEEEELL NO!"

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