Database Develop

Touch screen responsiveness issue

Hi there,
I'm having a problem with my touch screen. It works fine most of the time, except, when I tap the same area many times very quickly (like when I'm backspacing a whole message), that par of the touch screen eventually becomes unresponsive. It becomes responsive again once I turn the screen lock on and off again (the top button). I've read a few threads around with very similar problems (not on here I don't think).
I replaced the touch screen a week ago, but I've only noticed this today, so I'm not sure whether or not it's related.
I'm just running standard LG software and haven't put any third party stuff on there (apart from apps). I've done a full reset using the update utility, and using the hidden menu, but this did not fix the problem.
Here's some details about my phone:
Model: LG-P970
Android Version: 2.3.4
Kernel Version: 2.6.35
Build Number: GRJ22
Software Version: LG-P970-V20C
Please let me know if I should provide any more information. I'm just interested in knowing whether it's a problem with the touch screen, or the phone's software.
Also, I'm new to forums and what-not, so if I'm doing anything wrong, let me know!.
Ok, I've realised this is in the wrong category. Was bound to have done something wrong - won't happen again!
Thanks

Hi there,
Tell me please, does the same happen on the touch keys (menu, home, back, search)?
Also, do you have any screen protector applied?

I have said this few times in other posts..iIts a strange bug, like the touch being lost.
Its fixed easy by locking the phone, thus shutting down the screeen and touch sensor. After few seconds unlock the phone and check if it is solved, or do the process again.

Thanks
Hi Guys,
Thanks for the replies, sorry I've been away for a while.
It doesn't tend to happen on the home, back, etc, keys. It tends to happen mostly near where the backspace key on the keyboard is. It happens in other places, but it takes a lot more to trigger it to happen in the other places. (by trigger, I mean if you tap the same spot heaps when writing a message it starts to happen).
Also, yes, I've applied a screen protector. The screen protector got put on about 10 hours after the new screen, but I can't for the life of me remember whether or not it was doing it without the screen protector.
Yes, locking and unlocking the phone does fix the problem, but it's a bit of a pain doing this a few times when writing a long message.
I'd really like to know if anyone can tell me whether replacing the touchscreen will solve the problem, or if its to do with other hardware/software. I've since started using the CM roms and it's still an issue.
Cheers.

I have a touch-screen problem with my LG P970 (CM-10 stable)
Hi,
I have been using my lg p970 for more than 2 yrs however when I installed cm10 stable i my phone it works fine for some time then touch-screen does not response properly. When I touch in one corner response comes from other corner, especially while typing when I press one key 2-3 other keys are also pressed even though the keys which are press not even close to each other. I have install another keyboard from market this has reduce some misbehavior.
Please any one has a 100% solution to this problem please reply.
Thank You.

von Mandrake said:
Hi there,
Tell me please, does the same happen on the touch keys (menu, home, back, search)?
Also, do you have any screen protector applied?
Click to expand...
Click to collapse
Maybe this thread here:
http://forum.xda-developers.com/showthread.php?t=2516931
No solution yet, but lets gather the resources!

Another one
I'm with one of these P970h, the screen/digitalizer is cracked but works ok, I tried updating to CM10, the touch/soft buttons stopped working (they light up), also tried official 4.0.4, no luck, then the original 2.3 carrier modded, perfectly working! came back to 4.0.4, dont work anymore...
For me it is rom related...
for now I'm using NavBar with 4.0.4
Any ideas?

another one here..almost same with other members here,softkey not respon when in 4.0.4 and up ROM both stok official or custom,but working when back to 2.3.x down ROM and it not really responsive at all.try and pray for solution.

stubbornboy said:
another one here..almost same with other members here,softkey not respon when in 4.0.4 and up ROM both stok official or custom,but working when back to 2.3.x down ROM and it not really responsive at all.try and pray for solution.
Click to expand...
Click to collapse
My main reason for reverting back to 2.3.4. Usually occurred when receiving a call; I couldn't answer or reboot the phone. I had to pull the battery every time.
I'm not aware of any fix, save reverting back to a GB ROM.

androcraze said:
My main reason for reverting back to 2.3.4. Usually occurred when receiving a call; I couldn't answer or reboot the phone. I had to pull the battery every time.
I'm not aware of any fix, save reverting back to a GB ROM.
Click to expand...
Click to collapse
i think its hardware issue,,if i press and hold a little while on upper screen (right beside lg logo) touch screen became normal again. but sometimes need to hold on there when touch not work again. a member on this forum call it a flex issue of the touchscreen.
anyone know how much cost to replace it with new flex to fix this issue?

stubbornboy said:
i think its hardware issue,,if i press and hold a little while on upper screen (right beside lg logo) touch screen became normal again. but sometimes need to hold on there when touch not work again. a member on this forum call it a flex issue of the touchscreen.
anyone know how much cost to replace it with new flex to fix this issue?
Click to expand...
Click to collapse
If it works with 2.3.4 and not other versions, it's a ROM issue. Changing the screens probably won't help.
This loss of touch was reported by many users, and it's always a 4.0.4+ problem. Something software-wise is crashing, or there's a driver bug.

androcraze said:
If it works with 2.3.4 and not other versions, it's a ROM issue. Changing the screens probably won't help.
This loss of touch was reported by many users, and it's always a 4.0.4+ problem. Something software-wise is crashing, or there's a driver bug.
Click to expand...
Click to collapse
its also frezee not only touchkey but also screen sometimes but normal again when i hold that point,im on 2.3.4,but work only screen when in 4.0.4.
and it seem to be more responsive touchkey when i press and hold the upper screen that i say before better than i hold nothing (not so responsive).

See this... http://forum.xda-developers.com/show...php?p=53032940

[Q] Little annoyances with keyboard, LED in stamina mode [SOLVED]

Hello fellow Z owners,
I'm new to both the Z and Android, but not to forums, so I swear I've tried my best to do searches first :cyclops: anyway, have been using the phone quite extensively over the past few days, and here're a few little annoyances that I wish could be solved with your help:
Keyboard:
1) It seems that Google voice typing keeps automatically enabling itself after a while no matter how many times I've unticked the box. I don't like it because I prefer having the full stop button there instead as I use it a lot more often. The only work-around I've found so far is to go to settings, have the box unchecked, and directly leave the page with it running in the background. As long as I press menu (?) button and I see the settings page still there, the voice button doesn't come back on, it seems. Any proper ways to get it to disable for good?
2) After typing some numbers/symbols, the keyboard should (at least I thought) switch back to normal letter layout after pressing on "space", but mine doesn't. I've asked friends on other Android devices and theirs do switch back, so it seems like it's an Xperia issue? Is there a way I can get it to switch back from numbers/symbols layout to letters layout after pressing "space"?
3) I can't seem to be able to get rid of the smiley key on the keyboard (next to the numbers/symbols button). I have the smiley key unchecked already (under settings -> language & input -> xperia keybaord -> keyboard appearance -> additional keys), but it doesn't seem to work.
4) Similarly to #3, I can't seem to get it to change the keyboard skins neither, always just stuck on black&grey no matter what I choose (grey only, black only)
Stamina mode LED:
Basically, I want the corresponding LED notifications for an app to work under stamina mode. I understand why LED notifications are disabled, to safe battery, but LEDs don't use much power and if I have an app under "always active", the corresponding LED notifications for that app should also work, but it doesn't. Any way to make it work?
Thanks very much for reading all that in advance. Sorry I know my questions are a bit long, but I just thought it's best for me to be as precise with my questions as possible. Thanks again!

Your keyboard issues is only happening on yours. It is not an xperia thing. Might just be a bug in the keyboard. Just repair your phone with pcc or seus.
And stamina mode I don't think there's a workaround atm.

Thanks LitoNi. Good to know I have a lemon
PCC is PC Companion, I assume? And just find the repair function in there? Will it set my phone back to factory settings (hope not)? Thanks!
Edit: oh and sorry, so you mean your XZ doesn't have all issues 1-4? Thanks!

Lord Farkward said:
Thanks LitoNi. Good to know I have a lemon
PCC is PC Companion, I assume? And just find the repair function in there? Will it set my phone back to factory settings (hope not)? Thanks!
Click to expand...
Click to collapse
yes PCC is PC companion, and SUS (SEUS) is Sony (Ericsson) Update Service. When you repair with both, it will wipe everything and i advise you to back up everything before doing so.

LitoNi said:
yes PCC is PC companion, and SUS (SEUS) is Sony (Ericsson) Update Service. When you repair with both, it will wipe everything and i advise you to back up everything before doing so.
Click to expand...
Click to collapse
Ok thanks for that heads up!
Sorry so just wanted to clarify, you don't have any of my keyboard problems above?

Ok I've "repaired" the phone, still exactly the same problems. None of the issues have been solved above.
Anything I should look at, please? Thanks!

Lord Farkward said:
Hello fellow Z owners,
I'm new to both the Z and Android, but not to forums, so I swear I've tried my best to do searches first :cyclops: anyway, have been using the phone quite extensively over the past few days, and here're a few little annoyances that I wish could be solved with your help:
Keyboard:
Click to expand...
Click to collapse
Use another Keyboard
Lord Farkward said:
Stamina mode LED:
Click to expand...
Click to collapse
This should be fixed in 4.2.2, it does works as intended though. But I think Sony will give us an option whether to enable it or not in StaminaMode

Lord Farkward said:
Ok I've "repaired" the phone, still exactly the same problems. None of the issues have been solved above.
Anything I should look at, please? Thanks!
Click to expand...
Click to collapse
if it ask whether to do a full wipe or not, do a full wipe.
Repair it with SEUS if not,
flash a respective FTF file.

Thanks again. I did do a full wipe. Still exactly the same :/ will trying flashing I guess
So no one else have the same issues? Is it really just my phone? Just wanted to double check before I go ahead, don't want to go through all that and then come back and find out that all XZs have the same problems, you know... hope you understand

So, I sat down and played around with all settings, and guess what, I've finally managed to get it fixed.
You see, my phone was bought in HK and so its default keyboard was the Chinese keyboard (despite having selected "English" as default language...", so whenever I've changed any settings, it for some reason didn't work.
Once I've changed the default keyboard back to Xperia English, though, all my saved settings (no Google, no smiley etc) are now there. Furthermore, it also automatically switches back to the letters layout after I press on "space" after a punctuation or number.
Wonder why the settings didn't work when default wasn't English though... weird...
Anyway, just for any future references. Hope this will help other n00bs out there in case they run into the same problem.
Now fingers crossed for Sony to fix the LED notifications in stamina mode.......

Yay . I don't have the Chinese keyboard installed so I wouldn't know lol.
The stamina mode led, one Sony staff forwarded it to the technician, whether an option to enable it will come or not is still unknown.

Yeah hopefully they will.
Thanks again for your help mate.

[Q] Screen issue on Xperia Z

İ do have a weird issue on my phone and i don't know is it an hardware or software issue.
1.While surfing internet on some of browser's buttons appears grey lines.As you can see from screenshots it disappears if i restart the phone.
http://k1304.hizliresim.com/18/n/m8gv5.png
Ss.
http://m1304.hizliresim.com/18/q/mbfhj.png
2.when i answer a call while the phone ringing even I swipe the green accept button phone continues to vibrating for an half second.
Is this issues related to a hardware or software problems ?

This is a new sample

Hard to tell, most likely a software issue? Doesn't seem to be on the same part of the screen.
Have you tried repairing it with Sony update service? Try that then tell us if it resolves the issue.
Sent from my C6603 using xda app-developers app

İ did repair by sony update service it didn't resolve the issue

It looks like graphical corruption.
If that was taken with the screenshot feature and a software repair has not fixed it, it could well be faulty hardware. (I would guess at either the GPU or Memory).
Does it tend to do it more, the more you use the phone? i.e. when it gets hotter/stressed.

akarian said:
İ do have a weird issue on my phone and i don't know is it an hardware or software issue.
1.While surfing internet on some of browser's buttons appears grey lines.As you can see from screenshots it disappears if i restart the phone.
http://k1304.hizliresim.com/18/n/m8gv5.png
Ss.
http://m1304.hizliresim.com/18/q/mbfhj.png
2.when i answer a call while the phone ringing even I swipe the green accept button phone continues to vibrating for an half second.
Is this issues related to a hardware or software problems ?
Click to expand...
Click to collapse
if repair didn help
Flash another Stock* ROM
:good:

alexp999 said:
It looks like graphical corruption.
If that was taken with the screenshot feature and a software repair has not fixed it, it could well be faulty hardware. (I would guess at either the GPU or Memory).
Does it tend to do it more, the more you use the phone? i.e. when it gets hotter/stressed.
Click to expand...
Click to collapse
I tried a few stock rom and it didn't help either.And I couldn't observe it why it's appearing because I didn't see it today, also restarting the phone doesn't help also.I don't know it has connection with it because I have . Dead pixel on the middle of screen

Take it back to the shop and ask for an exchange or repair. Gl
Sent from my C6603 using xda app-developers app

xperia z screen problem when locked or turned off
hi, i bought this phone in march 2013. It happens when i bought it. when i locked the screen, look from above its nothing but from the side you can see not clear line all over the scree. its like full of hash tags. does anyone has it? What is it?

Touchscreen unresponsive on lockscreen

So I had my L90 D405N repaired (whole motherboard was replaced) and I noticed something strange afterwards. The touchscreen seems to be unresponsive, but only when I try to unlock the device. It's especially noticeable if I set a pattern unlock. I can only draw the pattern successfully after like 10 or 20 tries. The touchscreen basically does not record the whole pattern consistently. This is not such a big problem when using a simple swipe to unlock method, though still occurs from time to time. I have installed the latest available software update (I'm now running V10d firmware), also had the touch firmware updated, but the issue persists. Strangely enough, none of the issues are noticeable past the lockscreen. Does anyone have any ideas as to what might be the problem and the solutions to it? Thanks in advance for any answers that might come.

linasj said:
So I had my L90 D405N repaired (whole motherboard was replaced) and I noticed something strange afterwards. The touchscreen seems to be unresponsive, but only when I try to unlock the device. It's especially noticeable if I set a pattern unlock. I can only draw the pattern successfully after like 10 or 20 tries. The touchscreen basically does not record the whole pattern consistently. This is not such a big problem when using a simple swipe to unlock method, though still occurs from time to time. I have installed the latest available software update (I'm now running V10d firmware), also had the touch firmware updated, but the issue persists. Strangely enough, none of the issues are noticeable past the lockscreen. Does anyone have any ideas as to what might be the problem and the solutions to it? Thanks in advance for any answers that might come.
Click to expand...
Click to collapse
Oh! Sounds like the issue of phantom touches I once had.
Tiny water particles caused random touches while swiping that broke my swipes too.
The issues persisted even past lockscreen for me.
I cleaned my screen and put on a screen guard.
I dunno if this will help you, but this is what helped me.
Turn on "show touches" in developer options.
You might see phantom touches here and there when you swipe

Thanks! Will try that right when I get back home. Sure hope it works. I'll report back with results.
EDIT: tried removing screen protector and cleaning the screen, but the issue was still there. Even did a factory reset, but the unresponsiveness didn't seem to go away. I'm beginning to think the digitizer is messed up. I'll probably take it to warranty tomorrow. Again. Unless, of course, anyone has any solutions.
Sent from my LG-D405N using XDA Free mobile app

I am also having the same problem after replacing motherboard...
I tried factory reset and fpashed kdz again...
Same problem..
I called lg service centre who replaced motherboard..
Said that touch should be replaced....

Seeing as the issue is probably the same as mine, your phone's screen (and digitizer as well) just has to be replaced. That should not cost anything, so just have patience. My phone is working fine after everything's been fixed.
Sent from my LG-D405N using XDA Free mobile app

i have an LG L90 D415, and i have same issue.
the touch is irresponsive only when unlock the screen, but when i do a call and hang up, the touch works fine, i dunno why is this. i dont know if is hardware, or software.

Run an app that tests the touchscreen and/or do a factory reset (backup first, you will lose all data). If the problem persists after a factory reset using the stock firmware then you have a hardware issue.
Sent from my LG-D410 using XDA Free mobile app

I have the same un responsivness.. now I cant even get into my phone bc its locked and it wont let me touch the code so what can I do to get in my phone... it did just update firmware also.. plz help I dont have money for a phone

My touchscreen does not responsive and i couldnt drag even after the initial screen unlock. I solved this problem as follow: dial this 3845#*410# (my model phone is 410, if you have 405, put 405 insted 410). After, go to HW DEVICE TEST --> TOUCH TEST --> TOUCH FIRMWARE UPGRADE --> OK. Wait a minutes e after reboot the phone. Try again if not work in the first time.
Enviado de meu LG-D410 usando Tapatalk

solved my problem
brunolcs said:
My touchscreen does not responsive and i couldnt drag even after the initial screen unlock. I solved this problem as follow: dial this 3845#*410# (my model phone is 410, if you have 405, put 405 insted 410). After, go to HW DEVICE TEST --> TOUCH TEST --> TOUCH FIRMWARE UPGRADE --> OK. Wait a minutes e after reboot the phone. Try again if not work in the first time.
Enviado de meu LG-D410 usando Tapatalk
Click to expand...
Click to collapse
dude that was perfect....
solved mine....
thanks again....

Great tip
This tip also solved my phone issue.

On a friends phone we had the same problem. At first the touch gesture on the lock screen needed a few attempts and after some time it was impossible to do the gesture and we were essentially locked out of the phone.
I'm not sure if this helps anyone else, but for this L90 (405) phone the following helped: I applied hot air (from a hair dryer) onto the device screen and while the hot air was hitting the screen I was able to do the unlock gesture on the lockscreen successfully. This was repeatable because I required it a second time as the device locked itself while I was doing some data backup. As a side note: The screen had a small crack at one edge.
Though after the lock screen various other places like scrolling through galleries, pinch-zoom and swipe-keyboard did not work reliable.
brunolcs said:
My touchscreen does not responsive and i couldnt drag even after the initial screen unlock. I solved this problem as follow: dial this 3845#*410# (my model phone is 410, if you have 405, put 405 insted 410). After, go to HW DEVICE TEST --> TOUCH TEST --> TOUCH FIRMWARE UPGRADE --> OK. Wait a minutes e after reboot the phone. Try again if not work in the first time.
Click to expand...
Click to collapse
After I was finally able to unlock the phone again, then this above TOUCH FIRMWARE UPGRADE from brunolcs also solved my problem (after a second try, and removing the battery in between).
PS: One thing that helped during the backup phase before the TOUCH FIRMWARE UPGRADE. I connected a bluetooth mouse and then I was able to scroll with the mouse at important places were I needed to do backups.

Turning to the community with the same issue after I've tried just about everything I could think of. The problems started after the original digitizer was shattered and replaced with a knock-off. My touch firmware is already on the latest 2.07 version, heating it with a hair drier does not alleviate the symptoms, I've already tried four different touchscreens from four different suppliers, with some claiming for their wares to be "original" (thou what that means exactly is not entirely clear as you may know!) and still touchscreen is unresponsive on lockscreen for the first ~5-7 seconds. Once past lockscreen, everything goes away. This YouTube video depicts exactly what I mean.
Any ideas? Can any of you still on the original phone firmware launch service tools (3845#*405#) > HW Device Test > Touch Test > Check Touch Panel and see what it reports for Raw Data? (Mine says "Channel Status: PASS" but "Raw Data: FAIL".)

Anyone?

Hey,
don't know if this is the same issue, but the phone of my mother (LG L90 - D405) can't be unlocked while doing a call. Started with calling the mailbox, we were not able to unlock the phone to delete the messages. Screen didn't react at all until phone call ends. As soon as the call was over, the screen reacts completely normal.
Now the problem exceeded to any call: screen does not react, ending call is only possible, if your talk partner ends it. Screen reacts normally, when no call is made.
Does anyone know a solution? Haven't tried the solution posted above, perhaps doing a factory reset will solve the issue?
Or time to switch to a new phone, as this one was heavy used...

[Q] dead zone on touch screen

hi,
i have a dead zone in the upper part of the touch screen, i have found multiple references to problems with touch scree, but i discovered that my issue is in software not in hardware.
if i run a diagnostics in settings->about phone>diagnostics->test->touchscreen everything works and i am able to clean whole display, so hw works, but no application including system is not able to use a rectangle with y=<150,280>
i also enabled developer options->show touches and the problem is probably in api, dead zone is there too, so no wonder that all apps have a problem.
i dont know when this problem started, but i am sure it was after 5.x upgrade
any ideas?

My phone has a similar issue, and I have only noticed after updating to lollipop too. In my case, the screen does not recognize touches in a portion of the notification bar. After trying a lot of solutions, including repairing using FTF and PC Companion, I tried to downgrade to Kitkat. Although the notification bar worked normally, testing through the service tests menu (type *#*#7378423#*#* in dialer) revealed the problem was still there, but the area affected was a bit smaller, what explained why I could lower the notification bar again.
I believe this is a hardware issue. What makes you able to wipe the screen through the diagnostics menu is the fact that the area you can wipe is large, so when you swipe near the affected area, it wipes a larger area around it.
I've attached some screenshots showing what I got using the touch screen test (service tests menu).
I also found someone with a similar issue in another thread:
http://forum.xda-developers.com/showpost.php?p=60741536&postcount=22

joaomateus said:
My phone has a similar issue, and I have only noticed after updating to lollipop too. In my case, the screen does not recognize touches in a portion of the notification bar. After trying a lot of solutions, including repairing using FTF and PC Companion, I tried to downgrade to Kitkat. Although the notification bar worked normally, testing through the service tests menu (type *#*#7378423#*#* in dialer) revealed the problem was still there, but the area affected was a bit smaller, what explained why I could lower the notification bar again.
I believe this is a hardware issue. What makes you able to wipe the screen through the diagnostics menu is the fact that the area you can wipe is large, so when you swipe near the affected area, it wipes a larger area around it.
I've attached some screenshots showing what I got using the touch screen test (service tests menu).
I also found someone with a similar issue in another thread:
http://forum.xda-developers.com/showpost.php?p=60741536&postcount=22
Click to expand...
Click to collapse
Do your set has warranty? Have you taken it to the technicians yet?
---------- Post added at 02:56 AM ---------- Previous post was at 02:56 AM ----------
jipoid said:
hi,
i have a dead zone in the upper part of the touch screen, i have found multiple references to problems with touch scree, but i discovered that my issue is in software not in hardware.
if i run a diagnostics in settings->about phone>diagnostics->test->touchscreen everything works and i am able to clean whole display, so hw works, but no application including system is not able to use a rectangle with y=<150,280>
i also enabled developer options->show touches and the problem is probably in api, dead zone is there too, so no wonder that all apps have a problem.
i dont know when this problem started, but i am sure it was after 5.x upgrade
any ideas?
Click to expand...
Click to collapse
Did you find out any solution??

salehin4070 said:
Do your set has warranty? Have you taken it to the technicians yet?
Click to expand...
Click to collapse
My phone's still under warranty, I will contact them in the next weeks. If I can get any news I will post it here.

Sometimes when I turn on my phone the upper part of the screen doesn't work as well. Usually, turning the screen off and on again makes it go back to normal.
I don't think it's a hardware issue because I had my phone replaced (not because of this) and the problem persists. It doesn't bother me that much, however.

for last few days I m unable to swipe down the notification bar,its unresponsive over the whole notification bar. I cant even clear that zone while running the diagnostic test. please reply who has solution. I m really tensed. I don't have any warranty.

Have the same problem here. Does anyone already found a solution ?

Iam having the same problem on more than one place of the screen. Any solution?

Same Problem - Top half not working
I have about the same problem as the whole top half of the screen is unresponsive. Had it for about 3 weeks when it suddenly happened. Sent it away for repair about two weeks ago, still waiting on the outcome.

Hello, exactly the same problem with my Z3 Compact, I am sending it for repair next monday. Any updates from you guys?

Info
jipoid said:
hi,
i have a dead zone in the upper part of the touch screen, i have found multiple references to problems with touch scree, but i discovered that my issue is in software not in hardware.
if i run a diagnostics in settings->about phone>diagnostics->test->touchscreen everything works and i am able to clean whole display, so hw works, but no application including system is not able to use a rectangle with y=<150,280>
i also enabled developer options->show touches and the problem is probably in api, dead zone is there too, so no wonder that all apps have a problem.
i dont know when this problem started, but i am sure it was after 5.x upgrade
any ideas?
Click to expand...
Click to collapse
In this case it s possible to have software issue
so install PC Companion and use Update option and then Repair Firmware to wipe ur phone and install fresh firmware
if problem remains take it to service center for faulty touch screen
:good:

I Have the same issue after update with pc companion 23.4.A.1.200

Reinstalling the software didn't fix the problem in my case. If so many people have this issue i'd say it's about the built quality.

I got this issue in my device also. Just paid attention to it today. Sometimes it works fine, but sometimes no. I tried the test from diagnostics in the phone me, and sometimes i couldn't reach the upper area, around 1-2 millimeter width, but sometimes it works fine also in the test. I didn't perform any software upgrades, the phone has build 23.4.A.0.546, Android 5.1.1. May be it can be solved with any screen calibration? Any ideas will be appreciated...
I've recorded screen video, so you can see the problem area: https://youtu.be/rfn4j1yGluU
Thank you

Same problem. My device is d5833 brought in Australia last Christmas day. The problem occur three ago with the build 23.4.a.1.200. It wasn't fixed if upgrading to build 23.4.a.1.232 or wiped all to reset.
This evening my another d5833 also had the same problem with the build 23.4.A.0.546. I brought them on the same day.
I no sure if the android 5.1 cause this problem, but everything is ok before I upgraded. Probably the screen sensor was broken by the upgrades .

I have contacted the store, where i bought my device (www.clove.co.uk), and they will take care of sending it to Sony service center and repairing under warranty.
I also read about this issue on other forums, it looks like hardware problem, which can be fixed by touchscreen replacing.

I sent mine back to the store (handtec.co.uk) aswell. They are currently taking care of it. Anyway, I was told that I will be able to track the progress online, but I don't see the device in my account. Tried to contact them few times, so far they told me twice that the device was already sent back to me, and once that they have just received it back from repair. Opened a ticked, current status is "your item is booked with the manufacturer as soon as we got any information regarding your item from manufacturer we will update you via email". Let's see how it goes.

If you're rooted, reboot into recovery and wipe dalvik & cache (you don't lose any data or settings)... problem solved!
Brgds... /Tubgirl

Tubgirl said:
If you're rooted, reboot into recovery and wipe dalvik & cache (you don't lose any data or settings)... problem solved!
Brgds... /Tubgirl
Click to expand...
Click to collapse
10x, but my phone is not rooted. Already sent to service... Now i just have to wait...

Mine is also not rooted, and made entry in Sony for repair on 02/10, so far no response on the status.