Screen flashing issue after updating to Lollipop(Xperia Z1) - Android Q&A, Help & Troubleshooting

Assalam o alaikum!
i've updated my Xperia Z1 C6903 A few days Ago but after completing update process,when i started my phone the phone screen was flashing in a "O" shaped pattern.
the flashing is less visible and sometimes vanished when the brightness is low but when i increase the brightness the flashing Increase and become more visible and irritating.
i've twice downgraded my device to fix this issue but same results No fuite.
Is it a Hardware problem or software problem?
I also have uploaded an attachment but my camera cant capture the Flashing on my screen because the flashing rate is very High Arround 30 Flashed in One Second and it is flashing constantly regardless of Conditions and Apps.
Any help? :crying:
any guidence?
Thanx is Advance.
ALLAH hafiz

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Hi Everyone,
So I noticed not to long back that my phone has been changing brightness without the brightness bar moving. For instance I unlocked my phone moments ago and my screen was very bright. I went into my brightness settings and looked at the bar was set at 60%. As soon as I touch the brightness bar the screen dims back down to where it's supposed to be.
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Amrut223 said:
Hi Everyone,
So I noticed not to long back that my phone has been changing brightness without the brightness bar moving. For instance I unlocked my phone moments ago and my screen was very bright. I went into my brightness settings and looked at the bar was set at 60%. As soon as I touch the brightness bar the screen dims back down to where it's supposed to be.
Now I am thinking this is purely a software issue but I am still a little worried. I have a Galaxy S3 Optus AU. It is running the LF2 firmware and is not rooted or modified. I have turned off auto brightness and power saving for the screen and this problem still persists.
Has anyone else suffered any such issues with there device?
Click to expand...
Click to collapse
check if u have activated the auto brightness
Auto Brightness was not on when this happened.
Amrut223 said:
Auto Brightness was not on when this happened.
Click to expand...
Click to collapse
sry my fault...read to quick
hmm the only thinng i can imagine on the go is...has been your battery been on a very low amount of percentage
because i think the power saving mode is changing the brightnes on its own
No the battery was at 90% when it happened last. I have factory reset the device to see if it fixes the issue.
OK the issue is still happening. Altho I have now noticed that it happens when unlocking the phone. If I re lock the phone and then unlock it. It's back to normal.
Well...even stock firmware is not protected to crash or do sth it shouldnt do by the way
so think about a clean install of the rom or a software update this might fix your problem

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