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Knock On Not Working

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Thanks Meter: 3
By Anthony_xdl, Member on 30th April 2014, 05:27 AM
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14th October 2015, 08:42 AM |#81  
Senior Member
Thanks Meter: 243
The hidden menu trick worked on my LS980 on stock ZVE rom, rooted.
18th October 2015, 05:52 PM |#82  
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new update:
since problem reappeared again, I had to try something different.
First I have to say that I got LG G2 D801 (T Mobile), but it is used outside US with an international sim card. Even though I tried all above mentioned options, problems came back again, that is, ghostly movement of screen, and double knock not working.
I read that problem with ghostly movement is addressed to digitizer being damaged, I can assure you it is software problem only.
Steps that I took to pinpoint the problem.
1. As soon as I removed sim card from the phone, everything was working perfectly, super respond and all.
so, I thought maybe my sim card its the cause, but
for long time I suspected that T mobile applications might be the cause of what was happening to my phone lately, so I decided to root it so I can install an application for removing preinstalled application, in this case T Mobile applications. Once removed, I turned my sim card back and everything started to work perfectly. Phone is responding like it was a brand new phone.
So, in my case, problem was caused by T-Mobile applications.
So, for the past 24h I had zero problems.
I know that maybe this is a not so common situation (using US phone outside with an international sim card), but if you are like me, then this steps will turn your phone back to normal.
I hope that you will find this info helpful!
21st October 2015, 01:13 AM |#83  
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Thank alot. I rooted my kitkat lg g2 f320l (korean version) and after that my knock on was not working. But now it is working fully. Thanks again.
16th November 2015, 10:41 AM |#84  
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LG G2 D802 Touch not working proper i update touch firmware update but still problem
4th January 2016, 04:37 PM |#85  
Thanks Meter: 4
Originally Posted by Petbath

Hello to everyone,

after getting all this helpful info through this forum I've decided to contribute something myself.

I had the same issue after replacing my LG g2 screen. It worked fine before.
The problem in my case was the proximity sensor. It sits behind an oval window between the front facing camera and the light sensor. It has two small lenses, a bigger or the left and a smaller on the right.
If that sensor sits slightly wrong or the front rubber case is missing (I didn't noticed it the first time) or the required pressure from a small rubber behind (it is on the upper black secondary housing with the 7 screws) is not enough to hold it in a fixed certain place, it doesn't work correctly or at all.

When this happens the sensors detects near (meaning you have the device close to your face) and Knock unlocking is blocked. Also when you are making a call the screen goes off for the same reason, so it is easy to notice.

After I noticed and placed the front rubber case from the old screen, it was working, but slowly. It detected quickly the "near" position but it takes several seconds to re detect "far" position.

The final solution was reinforcing the small rectangular rubber which pushes the light sensor and the proximity sensor from behind, with two small pieces of sticker and the problem disappeared.

You can check that through the hidden menu (for my case 3845#*802#), HW Device test, ALC Proximity Test.
It should change rapidly from NEAR to FAR then waving your hand over the sensor.
If not, push firmly with one finger behind the sensor and see then if it is working

You da man!!! That was it. Thanks for posting!
19th March 2016, 06:59 PM |#86  
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sir how cam i quit from this menu
18th September 2016, 12:46 PM |#87  
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This Method works 100% for me with both Stock Theme or SPB Shell theme
=>>> THIS method has worked for me perfectly. i upgraded the touchscreen software and rebooted my phone and ever since, it has been working.
19th March 2017, 05:25 PM |#88  
Junior Member
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lg d618 knock on problem
Hello . Since I bought knock on hadn't worked . I thinks sensor is OK . It changes from near to far rapidly . Also I have tried upgrade and update touch from hidden menu and it didnt change . Phone is in Lg stock firmware . What I have to do ?
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