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.

touch screen starting to not work

hey,
I had a problem a few days ago where some parts of my touch screen (near the home, menu, etc. buttons) started to not work. and today when I woke up, the whole screen is not working. It seems to respond every now and then, but barely.
I'm assuming this to be a hardware problem, but I am not sure. Anybody had a similar problem before? disassembly would be my last resort, how should I go about fixing this? Thanks.

I have the same problem. about a half inch band across the very bottom of the screen. Weird thing is sometimes the whole screen will become unresponsive (if it stays on for too long) then turning the screen off and on and unlocking the phone makes it go away for a while. The digitizer glass in my phone seems to need replacing. I've scoped a replacement out online (don't have the link) for about 30 bucks. there are also many assembly/disassembly videos for the phone. Looks like it will take a lot to get the digitizer out.

I was having the same problem... Just replaced the digitizer and still have the same issues... anyone have an idea?

I have a similar problem but with the soft keyboard. It becomes unresponsive very often..tried many roms and diff softkeyboards but the ptoblem still there
Sent from my HTC Vision using xda premium

Weird touch screen.

Its been some days, I'm experiencing this weird touch screen problem.
My DZ touch screen doesn't respond properly.
For example:
If i see an image and slide just one finger up and down then it would zoom in and out. And then the whole screen becomes unresponsive.
It seems as if, its touched by itself. Even the softkeys would go numb. Only the haptic feedback of my search button works at that moment.
But the trackpad works perfectly.
But, If i lock and unlock the screen using power buttons, it would work properly for some few moment and then again the problem repeats.
At present I'm repeating this process of locking and unlocking screen to use my phone.
One even worst weird thing is that, if the device is connected to a charger and kept on the table or floor. This problem doesn't occur.
I have done system format, restored my nandroids and even changed Roms. The problem still exists.
Please note, i don't use any Casing or covers that would press the device hard for malfunctioning of screen. I have even removed and replaced my screen guard.
I'm sure, its not a software issue.
And even i dont think its a strip issue, because i dont use my physical keyboard always.
Can anyone say what hardware issue it might be..?
Or what i need to do? I'm really out of options.
Do i have to replace my whole screen or the digitizer..?
Thanks...

Thats no fun,
As you stated it's more than likely a hardware fault, the two most likely culprits would be the digitizer or the main flex cable
Which would be this and this
both relatively easy to replace depending on your experience
in 4.x and up ROMs check the developers setting to show touch or use apps like
z device test
or
yet another multitouch test
these wont help you fix the issue but may show you where the bad points are on the screen
best of luck

I know the problematic spot. Its near Search softkey. Even Yet another multi-touch test would stuck at that spot....
As you can see in the image, that i'm not holding anywhere, still it shows that somewhere around Search softkey its touched by itself.
In second image, If i move my fingers around, it would show the other touch responds, but if i slide near search, it would go and stuck there itself.
So, i guess i would first go with the flex cable.

In actuality I'm leaning toward the digitizer in your case, but its possible to be either.
And if you have a spare phone it may be worth disassembling even without buying anything. On a G1 I once fixed a similar issue just taking out the digitizer and cleaning the contacts on the ribbon and the edges of it as well, when I put it back it worked like new. I think some dust may have gotten into the edges but it may be worth a shot before buying anything... But could make matters worse so if you don't have a spare, buy parts first
Best of luck
Sent from my Nexus 7 using XDA Premium 4 mobile app

I guess i should try disassembling and clean it first. If it still persists then i would go for digitizer.
And thanks for giving a hope.
Thanks...

Asus Zenforne 2 automatically clicks on screen randomly on its own

My Asus Zenforne 2 suddenly started behaving unexpectedly.
Even if the screen is locked and closed, phone automatically tries to open but as it is locked, it will show wrong password.
But its keep on trying to open the screen, its like a continuous screen touch happens every time.
After I open using my password, it is accessing the phone automatically like opening application what ever is present and keep on doing something.
So basically phone behaves as some one keeps on clicking the phone continuously.
I thought it might be happening only during charging, but it proved me wrong.
I did restart many times, after every restart for few minutes, it works fine but after sometime, the same story.
I did clear the cache partition, but still same issue.
I did factory reset, it took around 3 hours.
Post that it is working as expected. Dont know what was the issue exactly. I had many apps installed.
But again after few minutes, the same issue appeared. System keeps on clicking randomly throughout the screen.
I am not able to do anything.

i have the same problem to...the screen die...change the screen all will work fine again
mine warranty passed...have to paid hopes yours is still under warranty

bishnuprasad14 said:
My Asus Zenforne 2 suddenly started behaving unexpectedly.
Even if the screen is locked and closed, phone automatically tries to open but as it is locked, it will show wrong password.
But its keep on trying to open the screen, its like a continuous screen touch happens every time.
After I open using my password, it is accessing the phone automatically like opening application what ever is present and keep on doing something.
So basically phone behaves as some one keeps on clicking the phone continuously.
I thought it might be happening only during charging, but it proved me wrong.
I did restart many times, after every restart for few minutes, it works fine but after sometime, the same story.
I did clear the cache partition, but still same issue.
I did factory reset, it took around 3 hours.
Post that it is working as expected. Dont know what was the issue exactly. I had many apps installed.
But again after few minutes, the same issue appeared. System keeps on clicking randomly throughout the screen.
I am not able to do anything.
Click to expand...
Click to collapse
Your problem appears consistent with "Ghost touch". It is a well known problem for zenfone 2. You can search about that with the keyword Ghost touch in here or in the google and read about it if you want.
If your phone is under warranty, contact the service center and schedule for the repair. They usually change the digitizer.
If your phone is out of warranty, you can order the digitizer for around US$ 30-50 and change it yourself. There are a couple of instructional video on youtube showing how to replace the digitizer for asus zenfone 2.

Thank you sway8966.
I observed few things
1. When the phone is in charging and little bit heated up, this happens very frequently.
2. After long usage, when the phone is warming up, this issue happens.
3. Sometimes, even it is there lying on the desk, still happens. Wiping up the screen cleanly helps sometimes.
4. Most of the times, the clicks or touches happening on one single row.
5. When the phone is locked as pattern, all the clicks happens on the first row of the pattern lock only.
So not able to conclude, what is the issue exactly. Whether it is screen problem, or due to heating up or due to insulation issue.
I have read multiple posts in many platforms but not able to conclude the root cause of the issue.

p.loong said:
i have the same problem to...the screen die...change the screen all will work fine again
mine warranty passed...have to paid hopes yours is still under warranty
Click to expand...
Click to collapse
My warranty also expired just a month back.
So no idea, how much it will cost and whether it is worth spending the money or go for a new device.

bishnuprasad14 said:
My warranty also expired just a month back.
So no idea, how much it will cost and whether it is worth spending the money or go for a new device.
Click to expand...
Click to collapse
It cost around $40 in indonesia, maybe u should consider to change the screen.
Oh yeah, dont take ur phone to asus service center when ur guarantee is alrd expired, it will cost around $120 to replace the screen :crying:

I also had this issue, but it was due to a cheap glass protector I had got from Aliexpress. I suspected it could be that, since the issue appeared just the day after I put the protector on my phone, about one week ago. This morning it suddenly began happening again and it stopped just after removing the glass protector, and it hasn't happened again yet, so I guess I was right. If any of you also used a cheap protector, that could be the source of the problem. I have now ordered a Nilkin protector, which is supposed to be of superior quality (and is indeed way more expensive) and hope I can use it without any ghost touches.

jman0 said:
I also had this issue, but it was due to a cheap glass protector I had got from Aliexpress. I suspected it could be that, since the issue appeared just the day after I put the protector on my phone, about one week ago. This morning it suddenly began happening again and it stopped just after removing the glass protector, and it hasn't happened again yet, so I guess I was right. If any of you also used a cheap protector, that could be the source of the problem. I have now ordered a Nilkin protector, which is supposed to be of superior quality (and is indeed way more expensive) and hope I can use it without any ghost touches.
Click to expand...
Click to collapse
I had exactly the same problem yesterday but the "ghost touch" problem had happened 3 days after I've put the protector. So I've removed it and the phone works fine again. It was this glass protector : https://www.amazon.fr/gp/product/B01GTE6TUA/ref=oh_aui_detailpage_o02_s01?ie=UTF8&psc=1 so avoid it

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