Develop Bugs

[Q] Advice on unlock/digitiser issue

Hi
I upgraded to my new DHD less than 3 weeks ago. It is not rooted and I did the recent OTA update over Christmas.
Over the last couple of days I have started to experience difficulty unlocking the device on the slide-to-unlock screen. The problem seems intermittent - somethimes it will unlock fine, and other times the slider just seems to "get stuck" at the bottom of the screen.
At first I thought this a bug or something, but after some investigation I am concerned there is a problem with the digitiser. I opened a picture and zoomed in to fill the screen and tested the touchscreen in different places by sliding the picture around. What I found was that the bottom 1cm of the screen above the keys does not respond properly to Up and Down swipes. It is fine however with side-to-side and also individual taps. This is obviously a problem when trying to move the unlock slider!
I've had a screen protector on for about a week - I don't imagine this has caused the issue but haven't removed it to test as yet as I don't have a spare. Aside from this, the device has been very well looked after, definitely no bumps etc and kept in an HTC leather pouch.
Any ideas? Should I return it to CW?
Thanks

OK, I seem to have resolved this for the time being but expect the problem to return.
I downloaded a screen test app that allows you to draw on the screen and got some very strange results. A 1cm band of screen about 1cm up from the bottom was completely unresponsive. Trying to draw a horizontal line within this band would result in lines being drawn either above or below it, or strange vertical lines "jumping" around. The rest of the screen was fine. I realised this is why I have been struggling to close the keyboard - the button is placed within this band and trying to press it would result in on of the buttons above or below being pressed. Also have had problems with the sapce bar.
I did a restart (not fast) and this has resolved the issue, however I expect it may return as I did a restart only yesterday.
At least it is obviously software and not the digitiser....

Hi again. As expected, the issue returned after a couple of hours. This time however, restarting is not making a difference.
I resorted to a hard rest, which has not changed anything either.
Any help/ideas would really be appreciated...

Best to return it for repairs or exchange. Seems like the digitiser is faulty.
Sent from my Desire HD using XDA App

olivierlee said:
Best to return it for repairs or exchange. Seems like the digitiser is faulty.
Sent from my Desire HD using XDA App
Click to expand...
Click to collapse
I agree, this definitely sounds like a hardware problem.

Digitizer Problem

So, initially I began having problems with "ghost touching", then, portions of my screen became unresponsive to touch in addition to the "ghost touching". I did the line drawing test multiple times. At times, it showed a dead space to the right (vertically only, horizontal was ok), other times, it was working fine. I was so focused on checking the right side of the screen, I didn't check the bottom. When I did, it showed an unresponsive area at the bottom as well. Almost as if the screen was off kilter. I did a factory reset through the normal phone menu and from TWRP and the ghost touching has seemed to resolve itself, however, the unresponsive screen is getting worse. Now a full 1/3 of the screen on the right is intermittently unresponsive.
I am hoping there is something I can flash on this phone that might assist the digitizer if it is software related. If not, could it be that the cable is not grounded properly or has possibly become partly unplugged? I know what a pain this phone is to take apart because I had to take my first M8 apart when I accidentally gave it a ride home in a cup of tea. (really tired after working one night, forgot the cup was in the cup holder). Turns out they really don't like that. My current M8 I bought from a private seller, so I have no warranty, no insurance and extremely limited funds at the moment for handling this problem. I've had this replacement phone for several months, so I know the phone wasn't defective when I got it.
I am rooted, running stock ROM, stock kernel and TWRP Recovery v2.7.0.2
Thank you in advance for any help.

Random Touch on the Screen.

I do not know whether this counts as ghost touch or not, but randomly there is a persistent touch on the bottom right corner of my Zenfone 2, ZE551ML. If i Lock the device and unlock it back again, (Through the power button), the issue goes away. It re appears after a while again.
I saw videos of people facing such issues on youtube, but in their cases, the entire touch automatically starts to act up. whereas in my case, this happens only if i start using the phone. And that too on the same area ( Bottom Right, Just over the Recents Button)
I wiped the screen / Scratch guard thoroughly. I even changed my scratch guard. but still the issue stays.
Im on Stock 183 (Not yet updated to 184).
Is this a hardware issue or a software one?
(My warranty just ended yesterday).
I feel this is software, because the touch works normally if i lock the device and then unlock it back.
Just for the record, my device passed the SMMI touch and multi touch test without issues.
Also i enabled the graph option under developer options. And i do not see any touch being registered under normal course.
But then when all the tools are off, randomly the issue just pops up again.
Does anyone have such issues?
Does CM or other Non-stock ROM solve this??

I actually a similar issue a month ago, which I thought was a software thing (completely wiped my phone, then installed latest XOSP) or me losing my mind, and it turns out it was neither.
It came back yesterday, and I learned that there's entirely a chance that the screen connectors are loose. Simply remove the back panel (the one with the screws, you'll need one of those eyeglass-repair screwdrivers) and press down on the connectors to make sure they're 100% snapped in and the issue should stop!
Also, see if Glove mode fixes it, since I know that works for a lot of people.

I had the problem. I just removed back cover and plugged a bit more the connectors that you can see when removing battery cover.
Its been 3 months without the problem.

gREENNNNN said:
I had the problem. I just removed back cover and plugged a bit more the connectors that you can see when removing battery cover.
Its been 3 months without the problem.
Click to expand...
Click to collapse
Kavka.V said:
I actually a similar issue a month ago, which I thought was a software thing (completely wiped my phone, then installed latest XOSP) or me losing my mind, and it turns out it was neither.
It came back yesterday, and I learned that there's entirely a chance that the screen connectors are loose. Simply remove the back panel (the one with the screws, you'll need one of those eyeglass-repair screwdrivers) and press down on the connectors to make sure they're 100% snapped in and the issue should stop!
Also, see if Glove mode fixes it, since I know that works for a lot of people.
Click to expand...
Click to collapse
Okay so
My issue is because of my flip cover.
I knew this wasn't hardware, coz the issue was only on one small area of the screen.
I did the following:
When there was ghost random touch.
I immediately removed my flip cover, and the issue went off
Did It twice, both times, it worked.
Thanks anyways.
Sent from my ASUS_Z00AD using XDA-Developers mobile app

Weird touch screen issue?

I had some ugly but purely cosmetic damage/scratches to the frame and screen on my Pixel 3 XL (fell about 8 inches out of my pocket on to my driveway while I was crouched, working under my truck) and I decided to get uBreakiFix (they are the official repair centers for Google and they use OEM parts and official Google repair manuals) to replace it for $400 because I was tired of looking at it and I'll be using it for at least another year and a half.
Anyhow, they ordered the parts last week and did the work today and everything seemed fine, the phone looked brand new but a few hours later I noticed while I was typing a text that when I was trying to type "an" my screen was registering a swipe between my two thumbs as I typed, causing my keyboard to type a bunch of letters and this kept happening until I stopped typing for a second and then it was fine. I just thought it was bug and restarted the phone, but now I notice it's doing frequently and randomly and not only when I'm typing. I download an app to test the touch screen and it seems totally fine but if I sit and tap two points on the screen one after the other over and over, randomly it will register as a swipes in between each other, repeatedly until I stop for a couple of seconds and then if I start again it will be fine. Sometimes this happens after two seconds of tapping, sometimes it takes several minutes.
I booted into safe mode and it still happened so I'm guessing it's the new display, but it just seems weird because it's completely random and the screen works totally fine otherwise (it registers all of my single touches and actual swipes just fine). I even thought maybe there was some sort of residue/coating on the screen from factory and gave it a clean with some 99% isopropyl alcohol but that didn't do anything.
Anyone experience anything similar before?

Similiar issue happened on a different phone and it was after screen replacement. Sometimes it was registering normally but then it was acting weird. Normally only when charging this might happen(Power signal quality and ESD) but normally not.
Try using a screen test app, show it to the shop for proof and request for replacement.

Weird Digitizer Issue (Just me)?

Fellow Pixel-ers,
So, I broke my screen about 8 months ago. It had coverage and got it replaced by a Google authorized screen fixer place.
I noticed early on that things didn't seem quite right. If I pushed down too hard on the screen, my touch wouldn't register. But, it didn't happen too often and I didn't want to have to deal with arguing that they may have poorly installed the new screen/digitizer and that it wasn't 'my fault'.
As time went on I started noticing that the almost bottom of my screen would not register a touch but mostly only at night. Again, it didn't happen too often and it usually went away after a little poking/prodding/pushing/.
I also thought it might be an application that I gave 'screen Overlay' rights that I shouldn't have and it was causing issues.
I validated my issue by using a Touchscreen Test app.
When I use an app like Vysor I am able to 'access' that area of the screen even when my fingers cannot. Does that validate this is a hardware issue?
The area affected was definitely more than just a few pixels (see screenshots).
More recently it was happening more frequently (not just at night) and it almost never goes away.
I wanted to make sure it wasn't a software issue. So I planned on dirty flashing my OS (AquariOS), but actually ended up accidentally upgrading to a clean version of Android 10. Unfortunately, the issue was still there.
I then did a clean flash and downgraded back to Pie w/AquariOS.
Shortly after getting back up the issue showed up again.
At this point, I have virtually lost all touch response for the bottom 1/8 (not quite the very bottom) of my screen. I've had to use a floating keyboard because the space bar falls right in that area. Sometimes I can't click 'next' or 'continue' in apps or web sites.
Has anyone ever experienced this very odd digitizer issue like this? Any thoughts/suggestions/ideas.
I'm guessing the only solution is a new phone as it is not worth the money to fix it.
So now I'm just waiting for either the Pixel 4A or 5 to come out so I can get a new phone I guess.
I just find this very odd how specific this area of 'dead pixels' is. I always thought it was more random than a specific rectangle.
I look forward to hearing from anyone.
A (not working with a full screen) Bug

I've faced the same issue mate....
a_bug said:
Fellow Pixel-ers,
So, I broke my screen about 8 months ago. It had coverage and got it replaced by a Google authorized screen fixer place.
I noticed early on that things didn't seem quite right. If I pushed down too hard on the screen, my touch wouldn't register. But, it didn't happen too often and I didn't want to have to deal with arguing that they may have poorly installed the new screen/digitizer and that it wasn't 'my fault'.
As time went on I started noticing that the almost bottom of my screen would not register a touch but mostly only at night. Again, it didn't happen too often and it usually went away after a little poking/prodding/pushing/.
I also thought it might be an application that I gave 'screen Overlay' rights that I shouldn't have and it was causing issues.
I validated my issue by using a Touchscreen Test app.
When I use an app like Vysor I am able to 'access' that area of the screen even when my fingers cannot. Does that validate this is a hardware issue?
The area affected was definitely more than just a few pixels (see screenshots).
More recently it was happening more frequently (not just at night) and it almost never goes away.
I wanted to make sure it wasn't a software issue. So I planned on dirty flashing my OS (AquariOS), but actually ended up accidentally upgrading to a clean version of Android 10. Unfortunately, the issue was still there.
I then did a clean flash and downgraded back to Pie w/AquariOS.
Shortly after getting back up the issue showed up again.
At this point, I have virtually lost all touch response for the bottom 1/8 (not quite the very bottom) of my screen. I've had to use a floating keyboard because the space bar falls right in that area. Sometimes I can't click 'next' or 'continue' in apps or web sites.
Has anyone ever experienced this very odd digitizer issue like this? Any thoughts/suggestions/ideas.
I'm guessing the only solution is a new phone as it is not worth the money to fix it.
So now I'm just waiting for either the Pixel 4A or 5 to come out so I can get a new phone I guess.
I just find this very odd how specific this area of 'dead pixels' is. I always thought it was more random than a specific rectangle.
I look forward to hearing from anyone.
A (not working with a full screen) Bug
Click to expand...
Click to collapse
Hi bro, I've face the exact same issue, but for me it was at the center of the screen. Luckily my phone was under warranty, but getting them to replace my touch digitizer was a whole different thing. At first they just didn't acknowledge the issue, then I tried showing them proofs but they didn't believe as they were from some third party apps. Finally, I used markup to show them the issue and recorded it took some screenshots as well. So, they replaced my digitizer at last after constantly speaking them for 2-3 weeks. I can only suggest you that if your phone is still under warranty or you have accidental damage coverage, ask them to replace them. Otherwise, it'll be better to buy a new phone as replacing the screen from your pocket may be very costly.

For anyone who reads this thread,
I resigned myself to having a bad digitizer but was starting to look to replace the phone. Then about a week later I inadvertently dropped the phone in a pool. Unfortunately, as the screen had been replaced the waterproofing was no longer good and phone was a brick. So I never resolved the issue but will always assume that the company that replaced the screen did a less perfect job and that when a screen is replace the phone looses it's waterproofing ability
-A (new Pixel 3XL owning) Bug