Develop Bugs

[Q] Touch sensitivity issue cause?

I've been reading through the previous threads and I'm still confused if the issue is hardware or software related. I have the AUO panel and have broken swipes, and times where I can't scroll properly. This has been going on a couple months now and it's getting on my last nerve since it's frequently happening when I need my phone to work properly. All this time I assumed it was software but a couple threads mentioned it was hardware. Trouble is, some people with the JDI screen also have issues so I don't understand. My question is, has anyone ruled out software by flashing an AOSP rom? I'd rather not send this to Sony if at all possible since they don't cross ship and I'd be without a phone.

I have rarely an issue with the touch screen, when swipe up or down, it doesn't swipe it acts like I've just touched (clicked) once the display. I think it is a software issue, because in my case, if I turn off the display wait for 2-3 seconds and turn it on, it works with no problems.
Can you point me please to other threads that have this issue in discuss?
Thank you!

Have you removed the asf from the screen and placed an actual screen protector on it? I found that this really helped with the weird screen issues.

I have a screen protector over the ASF. But that has nothing to do with my issue, because, like I said, when I turn the display off, wait 3 seconds, and on again everything is working normally.

vibecatalin said:
I have a screen protector over the ASF. But that has nothing to do with my issue, because, like I said, when I turn the display off, wait 3 seconds, and on again everything is working normally.
Click to expand...
Click to collapse
Yeah, I reboot usually and the issue temporarily goes away. Then it will come back a day or two later. I'm afraid to remove the ASF because I've read some issues with goes touches even with a screen protector. I just want the issue to be fixed... I was thinking of flashing a AOSP rom but wanted to see if anyone with that ROM had any trouble or not. Maybe the L update in January will fix things.
Here are the resources I've read on this issue:
http://talk.sonymobile.com/t5/Xperia-Z1-Compact/Touchscreen-loosing-touch-issue/td-p/580111
http://johnhaller.com/blog/2014-03-06--sony-xperia-z1-z1s-touch-screen-issue
http://forum.xda-developers.com/showthread.php?t=2770293

I have rarely that issue, like I said I just turn off the screen, and after 2-3 seconds turn it on and it's gone. I'm sure this is a software related issue.

If it helps at all, I never had the issue in the two weeks I tried an aosp rom. However the camera and battery life were a bit lacking so I'm back on a stock rom.

I haven't have the issue too in the past weeks, I've wiping cache and dalvik cache pretty often , because I've installed some system apps. Anyway I will really want to know the cause of this
L.E. I'm still on stock firmware.
L.E. 2 : The Glove mode function, in the Settings-Display menu has an application or something? Has a file redirected to it? Is there in the phone's system a file than can be edited or deleted or something for the glove mode function? Maybe we will find answers there.
I'm not sure that I've made myself understood with the question.

Ghost touches in upper third of screen

Hi.
My Z1C seems to have a similar case of faulty display as described in some other threads here, but actually a bit different. The phone is stock, not rooted, running 5.1.1
Whenever I do something, there are ghost touches in the upper quarter or third of the screen. They only happen when I am not touching the screen myself. It happens no matter what I do. When I browse internet, it clicks links, when I scroll contacts, it calls people, when I am on facebook it gives likes etc... It seems like the more demanding task the phone is performing, the more ghost touches.
I turned on the developer settings and the "show pointer location" option, which leaves track of the last touch on screen, so I can research the issue.
I found out that when the phone is on home screen, it happens very rarely or not at all - the track of my last touch stays until screen turns off.
When I jump into the touchscreen service test, it does not happen at all. I can draw a line around the whole screen and it stays higlighted indefinitely.
In lock screen, it also doesn't happen.
I tried it in Sketch and it confirmed what I thought, when I was just sketching, from time to time a dot appeared in the upper part of the screen, but when the phone was downloading or installing in the background, the screen literally had seizures. I touched and released and then a storm of dots started to appear around the top part of the screen. It stopped after 5+ seconds, and after another input from me, the screen got another fit, drawing more dots.
I don't have any experience, but I think that since the problem doesn't happen constantly and it doesn't even happen at all in test mode, it could be a SW mistake.
I have found this thread https://forum.xda-developers.com/showthread.php?t=2691849 and I'm willing to try, but 1) my phone is still under warranty and 2) I have never done a root so I am not too eager. Do you think I should try that? Or has anyone found another solution for this problem?
Thanks.

Slivovidze said:
Hi.
My Z1C seems to have a similar case of faulty display as described in some other threads here, but actually a bit different. The phone is stock, not rooted, running 5.1.1
Whenever I do something, there are ghost touches in the upper quarter or third of the screen. They only happen when I am not touching the screen myself. It happens no matter what I do. When I browse internet, it clicks links, when I scroll contacts, it calls people, when I am on facebook it gives likes etc... It seems like the more demanding task the phone is performing, the more ghost touches.
I turned on the developer settings and the "show pointer location" option, which leaves track of the last touch on screen, so I can research the issue.
I found out that when the phone is on home screen, it happens very rarely or not at all - the track of my last touch stays until screen turns off.
When I jump into the touchscreen service test, it does not happen at all. I can draw a line around the whole screen and it stays higlighted indefinitely.
In lock screen, it also doesn't happen.
I tried it in Sketch and it confirmed what I thought, when I was just sketching, from time to time a dot appeared in the upper part of the screen, but when the phone was downloading or installing in the background, the screen literally had seizures. I touched and released and then a storm of dots started to appear around the top part of the screen. It stopped after 5+ seconds, and after another input from me, the screen got another fit, drawing more dots.
I don't have any experience, but I think that since the problem doesn't happen constantly and it doesn't even happen at all in test mode, it could be a SW mistake.
I have found this thread https://forum.xda-developers.com/showthread.php?t=2691849 and I'm willing to try, but 1) my phone is still under warranty and 2) I have never done a root so I am not too eager. Do you think I should try that? Or has anyone found another solution for this problem?
Thanks.
Click to expand...
Click to collapse
As You have warranty, I would strongly suggest that You go for a repair. I had the same issue in beginning, ghost touches appearing randomly, going away only after reboot. I was rooted and xposed, so went full stock without restoring any apps or data from internal storage, yet the problem remained, thus ruling out the point that it was software problem. And then after a week or so, that much part of screen stopped responding to touch entirely. You can see details over here, Another user had same problem as Mine and had the same end result,

OK then, I'll go for a repair. Thanks for the tip.

Slivovidze said:
OK then, I'll go for a repair. Thanks for the tip.
Click to expand...
Click to collapse
I am having exactly the same behaviour as you described .
Ghost touches happening on the upper part, and triggered when a demanding task is running.
Actually I didn't realized completely about this, I thought it was just random, but right now after I saw your post, I tried an app similar to Sketch while upgrading apps or playing a video in the background. And dots in the upper part start appearing crazily.
Did the phone repair solve your problem ? Mine is not in warranty, so I'll have to pay for it.
But also in my case, before this thing happened, I got some water damage and that upper quarter of the screen stopped responding.
After replacing screen+digitizer I got this very specific behaviour you described.

karamaz0v said:
I am having exactly the same behaviour as you described .
Ghost touches happening on the upper part, and triggered when a demanding task is running.
Actually I didn't realized completely about this, I thought it was just random, but right now after I saw your post, I tried an app similar to Sketch while upgrading apps or playing a video in the background. And dots in the upper part start appearing crazily.
Did the phone repair solve your problem ? Mine is not in warranty, so I'll have to pay for it.
But also in my case, before this thing happened, I got some water damage and that upper quarter of the screen stopped responding.
After replacing screen+digitizer I got this very specific behaviour you described.
Click to expand...
Click to collapse
In my case, I realized that I bought (probably) a badly re-fitted phone. Display's backlight was visible around screen panel edges, where I'd say it shouldn't be visible at all. I decided to return the phone and got a refund.
Sorry for not being able to help you.

Slivovidze said:
In my case, I realized that I bought (probably) a badly re-fitted phone. Display's backlight was visible around screen panel edges, where I'd say it shouldn't be visible at all. I decided to return the phone and got a refund.
Sorry for not being able to help you.
Click to expand...
Click to collapse
Ok. The aftermarket screen I got has that issue with the screen edges also. Very probable you are right.
In my case I water damaged myself. It seems that after 2 years of intensive use, waterproofing is gone, by accumulation of slight hits or so, never had a single crack on the screen. I read many posts reporting this happening, even with much less use time.
Too bad, I loved the phone, but I'm afraid that sending it to repair will mean to change the PCB or similar for a complete fix, which can come to a ridiculous price.
Seems it will be time to move on...

Yeah. If you want it fixed properly, you'd need to send it to Sony, and for the money it would cost you, you can probably gen a new phone. Sadly, similar phones aren't made anymore.

Redmi note 8t huge issue with screen please help!

So I've gotten Redmi Note 8t half a month ago or so.. and about the time I updated to MIUI 11 I've started experiencing this weird bug.. Any app or screen or page or icons from the home screen or buttons from apps that remain turned on for some time (literally anything longer than 15 seconds) kind of stay "etched" on my screen for some time (relatively equivalent to the time the relevant app/screen/page was turned on).
I have no idea why this is happening so any help would be massively appreciated. A photo of the problem attached.
Ps this bug appears on every darker screen, not just on home screen.

novak.vujacic97 said:
So I've gotten Redmi Note 8t half a month ago or so.. and about the time I updated to MIUI 11 I've started experiencing this weird bug.. Any app or screen or page or icons from the home screen or buttons from apps that remain turned on for some time (literally anything longer than 15 seconds) kind of stay "etched" on my screen for some time (relatively equivalent to the time the relevant app/screen/page was turned on).
I have no idea why this is happening so any help would be massively appreciated. A photo of the problem attached.
Ps this bug appears on every darker screen, not just on home screen.
Click to expand...
Click to collapse
the images don't seem to be loading for me, but looking at your description it appears to be a burn-in problem.
I'd suggest you bring it to a service center to have it checked.

jc9896 said:
the images don't seem to be loading for me, but looking at your description it appears to be a burn-in problem.
I'd suggest you bring it to a service center to have it checked.
Click to expand...
Click to collapse
Thanks for your reply. Try opening them by clicking on the link and then tapping on "view full image" - it's the only way they'll load I've no idea why, today the whole xda website behaved very unresponsive for me, maybe they didn't upload properly.
Anyway I've just now googled "burn-in" (yep I'd never heard about this before) and from whar I've seen it seems pretty similar to my problem.
Although, in my case, the icons/buttons/keyboard letters that "etch" themselves into the screen after being used for some time do disappear after some time (usually dependant on the time those apps/icons/letters were shown/used on the main screen.
PS The thing is new, I've no idea how this could have happened.

jc9896 said:
the images don't seem to be loading for me, but looking at your description it appears to be a burn-in problem.
I'd suggest you bring it to a service center to have it checked.
Click to expand...
Click to collapse
I had this issue with a Moto G5, apparently it is not permanent, wich is nice, because when its permanent like in the case of amoled displays, the only real solucion is to replace the display. In this case to minimize it I downloaded a blue screen filter app and lowered the screen brightness to around 70 or less, btw this usually happens when you are watching bright stuff or when the phone is hot, also try to use dark mode whenever you can.

FOUND A SOLUTION
After tampering with many a setting, I found out that setting the colour temperature of the display in the stock settings of the phone to cool renders the burn-in almost completely invisible.

novak.vujacic97 said:
FOUND A SOLUTION
After tampering with many a setting, I found out that setting the colour temperature of the display in the stock settings of the phone to cool renders the burn-in almost completely invisible.
Click to expand...
Click to collapse
nice to see your problem has been solved!
some LCDs have screen retention when displaying certain colour temperatures.
also, seems like your attached photos are working again

screen stutter, complete loss of touch.

Been using the phone for the last 12 hours and I noticed something towards the end of my use last night.
The screen seemed to become unresponsive. And when it would work it would start to make its own input when scrolling and opening any app or link my finger would drag over while scrolling.
Changed refresh rates, changed resolutions, even seen if the blue light filter was the issue. Nothing.
Almost seems like the screen drops frames when scrolling, like it gets caught on something.

New development. Fingerprint sensor doesn't respond at all and inputting a pattern is damn near impossible. Going to try removing the screen protector to see if that could also be the issue

Did a factory reset
Issue seems to be where the finger print scanner is
It's almost like a dead or unresponsive zone.

Sounds like a factory defect, better have it replaced if resetting didn't worked.

Small video showing when scrolling over the fingerprint reader, the screen almost loses input

Defect.

Samsung has been little help lol. They want me to send it in for repair instead of an exchange. They also said to just order a whole new one and return the one I have now except the black 128 is sold out

imtjnotu said:
Samsung has been little help lol. They want me to send it in for repair instead of an exchange. They also said to just order a whole new one and return the one I have now except the black 128 is sold out
Click to expand...
Click to collapse
Sounds like Samsung support LOL...sorry you're having issues

Did you remove the factory installed screen protector? Maybe it's the cause of the issue

Return that pal, that doesn't sound good at all.

lovers74 said:
Did you remove the factory installed screen protector? Maybe it's the cause of the issue
Click to expand...
Click to collapse
one of the first things i did to trouble shoot. still having the issue. sometimes the screen completely loses all touch registration and it doesnt even know im trying to swipe or push on things. just realized it did this also after tmobiles new software update.
im still waiting here to hear back from samsung on how they are going to fix this issue

The same thing happens to me. Pulling down the notification shade seems to be the only thing that still works. It seems to goose the phone and it starts working again.

Test using the *#0*# diagnostic menu and use the Touch test.

Green tint only on unlocking device - acceptable?

I bought this used s9 for quite affordable price. Everything looked fine during testing except a greenish shade which happens only when unlocked and happens for like a second.
On searching internet, i found threads, yt videos by a number of people, almost all claiming that it is an update consequence. My questions are
1. Is it a software issue? If yes, can I expect some wayto solve - official ota or root and custom or old rom (if possible at all)?
2. If not software issue, is it a software induced hardware issue? Any way to repair without paying full for display?
2.1 If i get it replaced somehow, will itcome back again?
3. In any case, if I don't get it repaired, how long can I expect the deviceto be functional; ie before this green shade becomes permanent instead of being intermittent making device unusable?
Thank you

If it only happens for a second the only thing I be concerned about by the possibility of a rootkit or virus.
If running on Android 9 or higher and you did a factory reset already, that should have killed any unwanted critters.
Do a display check with ScreenTest. If it passes it should be good to go and just a transient glitch.
You've heard of The Matrix, right?

blackhawk said:
If it only happens for a second the only thing I be concerned about by the possibility of a rootkit or virus.
If running on Android 9 or higher and you did a factory reset already, that should have killed any unwanted critters.
Do a display check with ScreenTest. If it passes it should be good to go and just a transient glitch.
You've heard of The Matrix, right?
Click to expand...
Click to collapse
Hahah
This is something different. I asked a reseller and he said that such displays may last anywhere from 1 hour to 1 year.
Internet is filled with such questions.
Can you please help answering other questions if not this one, like if downgrading to older android possible or not?

The green only lasts for a second or so when opening the lock screen?
Never any other time?
Then it's not hardware.
AMOLED displays can last for many years. ScreenTest gives you a good idea of it's condition. Generally failure is gradual with the blue pixels failing first, red last.
The boot loader version dictates if you can downgrade or not.

...

blackhawk said:
The green only lasts for a second or so when opening the lock screen?
Never any other time?
Then it's not hardware.
AMOLED displays can last for many years. ScreenTest gives you a good idea of it's condition. Generally failure is gradual with the blue pixels failing first, red last.
The boot loader version dictates if you can downgrade or not.
Click to expand...
Click to collapse
So far, only immediately after unlocking. Haven't used much tho.
People say temp fix to all such issues is to Enable Always On display and double tap to wake screen instead of using Power button.
Can you ease tell which ScreenTest app it is? Playstore shows several with similar names.

tarun0 said:
So far, only immediately after unlocking. Haven't used much tho.
People say temp fix to all such issues is to Enable Always On display and double tap to wake screen instead of using Power button.
Can you ease tell which ScreenTest app it is? Playstore shows several with similar names.
Click to expand...
Click to collapse
Like I said if it's transient it's no issue.
This is the one I use:

Hi.
My s9 has this problem which everything turns green or worst, depending on the brightness level.
I can repeat the bug 100% of the time: just use the power button to turn off the phone two times: one to put into black screen and again to turn on. Then the screen misses some horizontal lines and is all buggy.
I shall record a video to share my problem but again, this can only be avoided by using aways on display to turn on the phone and then all goes back to normal.

spamtoaster said:
Hi.
My s9 has this problem which everything turns green or worst, depending on the brightness level.
I can repeat the bug 100% of the time: just use the power button to turn off the phone two times: one to put into black screen and again to turn on. Then the screen misses some horizontal lines and is all buggy.
I shall record a video to share my problem but again, this can only be avoided by using aways on display to turn on the phone and then all goes back to normal.
Click to expand...
Click to collapse
Try clearing the system cache.
A hard reboot.
Try in safe mode.
A factory reset may help but if that fails try flashing to the same version. If Android 8 or lower it could be caused by a rootkit that a factory reset won't purged. However this isn't a typical symptom nonetheless the firmware maybe corrupted.
If none of the above works it's a hardware failure, likely the display.