Screen Contrast vary randomly when switching on and off the screen after updated to 35.0.A.1.297

[mbv041080]

Sometimes when I switch off the screen and then turn it on again, the screen contrast would become dimmer then before randomly, then I switch it off again, wait for a few seconds then turn it on, the screen contrast would return to normal randomly, not everytime. This annoying issue appears after I updated to 35.0.A.1.297. I had already turned off the adaptive brightness but no use. Sony would you please help to identify the issue and fix it in the next firmware update?

[Jonas]

Hi @mbv041080, I'm sorry to hear about that.

Did this start to happen directly after the update was installed or was there a few days after you installed the update? If there was a few days after the update was installed?

I would recommend that you reboot your phone safe mode to see if a third party application is the cause of this behaviour.

Let me know how it works in safe mode!

[mbv041080]

This started directly after the update was installed.
I'll try the safe mode then...

[mbv041080]

I tried safe mode already and the screen contrast still becomes dim after switch it off and on randomly.
I hope this is just a software issue rather than a hardware defect.

[Jonas · Accepted solution]

Thanks for the update!

I just tried this one a Xperia X Performance with the latest software installed and I did not experience the same behaviour when I turned off and on the display.

I'd recommend that you perform a software repair using Xperia Companion. This will delete all data stored in the internal storage of the phone so I recommend that you backup using Xperia Companion before you perform the software repair.

When you have completed the software repair, try turning the display off and on before you restore the backup.

Please keep me updated!

[mbv041080]

I did a software repair and then used it for a whole day, I didn't notice the issue anymore.

Thanks Jonas & Sony.
Now I have to figure out that which app causes this issue......

[Jonas]

Thanks for the update, I'm glad to hear it's working now.

It's most likely not an application that was the cause of it not working correctly since you experienced the same in safe mode prior to you performing the software repair. It sounds more like something may have gone wrong with the update and the software needed to be reinstalled.

Let me know if there is anything else I can help you with!

[mbv041080]

Update again...

The issue appeared again in last few days before and after I updated to android 7.0, so I sent the device to service centre, and have to wait until next Tuesday...
(now using m4 aqua

[Jonas]

Hi again!

I'm so sorry to hear that.

I hope everything works out with the repair so you can enjoy a phone without troubles as soon as possible.

Let me know if there is anything else I can assist you with and have a great weekend!

[mbv041080]

Updated.

The issue appeared AGAIN and AGAIN after I sent the phone to service center and collected it TWICE.

1st time, I was told that the phone was flashed a "new" firmware (same version as I updated before) then nothing wrong with the hardware;

2nd time (yesterday), I was told that the light sensor had been "calibrated" and the phone, again, was flashed a "new" firmware (exactly the same version), and then nothing wrong with the hardware.

Both time when the phone was getting warm, I turned the monitor off, used my palm to rub the monitor off to get rid of fingerprints, then turned it on, the contrast and color of the monitor would become dim and dark randomly.
Besides, I've found that the LED indication of proximity sensor was turned on when I turn off and on the monitor without unlock the screen. (I saw a little red LED that on the right side of the light sensor in a complete dark environment without any light)

M4 Aqua does not behave the same as this X Performance, both the screen contrast issue and the indication of proximity sensor, eventhough I installed the same applications to these two phones.

I'm tired for exchanging phones already, Sony would you please help this frustrated customer to find out the answer?