Galaxy S4: Proximity sensors activates, but doesn't turn off

[Galich]

I've just registered to thank you. This really had helped. I didn't have compressed air, so I just have blown through a napkin with my mouth. I couldn't find the solution of this problem in Russian Internet.
Thank you, good man!

 

[Iamviveksri]

I too joined just to thank you for this post....saved my phone from rooting to fix the proximity sensor. Wow@Compressed air ! Who would have thought?

 

[Gigore]

Re: Proximity sensors activates, but doesn't turn off

Like others, registered just to say thanks...

 

[fandm2]

I just wanna note. Blowing up didn't work for me. Just simple instructions from here https://forum.xda-developers.com/showthread.php?t=2771972 helped me. But the file "/efs/prox_cal" didn't exist on my firmware and I created one with the command "echo -en $'\x96' > /efs/prox_cal". So, now in test mode (*#0*#) I see the high value 255 and the low value about 150 and the proximity sensor works!