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Why does my screen go black during calls?

Why does my screen go black during calls?

I own and operate my own cell phone repair biz and need to figure this issue out asap for my customer. I've now had this happen to a couple customers phones.

Asked by: Guest | Views: 221
Total answers/comments: 6
bert [Entry]

I experienced this issue when I replaced the frame on my phone and had to transfer everything over. The proximity sensor wasn't close enough to the glass onto the new screen so I placed a folded piece of paper between the sensor and the black piece that screws down. Make sure you place the rubber piece in the frame before installing the proximity sensor. I installed a program called sensor kinetics to see if the proximity sensor was working properly. I hope this helps! It took me a couple hours of troubleshooting to come up with a solution. The issue is that the proximity sensor wasn't close enough to the screen and I believe it was reflecting off the glass and getting a false reading. Download that program and scroll down to the proximity sensor. It will either read 5CM or 0CM. Mine was always reading 0CM. Something else to note: if you unplug the sensor with the phone on, you will need to reboot the phone to get a reading in the program.
bert [Entry]

"I had the same problem. Check the old lcd, it has a small rubber with 2 holes where the proximity sensor fits into, it aligns and holds the sensor in the proper position.

This is why so many people have this problem because its unnoticeable at a quick glance.

Guaranteed this will fix your problem."
bert [Entry]

I have the same problem until I cleaned the sensor beside the front camera,and I stopped experiencing it immediately
bert [Entry]

"I have just sorted one of these out. We replaced a full display and after a couple of weeks customer got in touch to say the double tap on function did not work and when on a phone call, the screen would not illuminate when removed from ear until the other person hung up.

Proximity sensor covers these issues.

There was an very slight gap between the rubber proximity sensor seal and the screen glass, gently pushed the rubber seal onto the glass, reinstalled the sensor and put a small bit of card over the top of the sensor before putting the black plastic cover back onto the top circuit board.

Result, sensor works great on calls and double tap works both to wake and switch screen off"
bert [Entry]

I took a small screw driver and scratched of the tint in that part of the screen and it worked like a charm. You can see the censers but my customer did not care as long as it worked. Also an option.
bert [Entry]

"Hello idocphonerepair ,

enter to maintenance menu of your phone using 3845#*802#select Device TestSelect Individual ItemSensor Testpreform test and try to re-calibrating the sensor

Verify sensor functionality using below app in play store

https://play.google.com/store/apps/detai..."