Develop Bugs

[Q] Touchscreen stops working

Hi,
sometimes the touchscreen of my defy stops working (but the phone is not frozen)
and the only way to fix it is to lock/unlock the screen...
does anyone have the same problem (and can help me)?
thanks
P.S
i've had the problem both with stock rom (2.2) and with cyanogenmod rc 1.5

When this happens, do the 4 buttons below your display still give you haptic feedback (little vibration) or do they react not at all?
Also, does this only happen when there's the normal launcher/standby screen active or when there's an other app active too ?
Did you undervolt ?
Edit: Also, this seems to be a hardware problem which seems to be well known in a certain German android forum but I cannot find much about it in here. In short, the digitizer unit seems to be broken for some people and locking/unlocking helps because it disconnects and connects power for the digitizer. The people there fixed the problem by replacing the digitizer (which isn't easy at all!).
It would be nice to have someone from XDA who had this problem before too, to confirm this problem!

First of all, thank you for the answer
When I have the problem, 4 buttons stop working too.
It usually happens after a period of stand-by, i don't undervolt or have some other application running than the launcher (ADWlauncher).
I bought the phone one week ago, if it is an HW problem, i can't repair it by myself...

I'd recommend to wait and see whether xda has other suggestions for you and if not, just check the Motorola hotline and ask whether they know something and if they do change it for free.
Also, what you describe fits perfectly to what I've read elsewhere (don't know whether I'm allowed to post a link here or if it were useful at all because it is in German). So it sounds like your digitizer could really be defect.

ok, even if i hope to solve the problem by myself...

News: They've changed the touch screen, but the problem is still present...
Can it be a sw problem??

Keep sending it back, they will replace it in the end.
Sent from my MB525 using Tapatalk

the whole phone?

Yes, the whole phone. They have two year warranties, but don't put up or make do, you should have a phone that works right
Sent from my MB525 using Tapatalk

I use to get that problem on stock and some versions of CM.
Was definitely a software problem for me, havent had that problem since I'm on nightlies.

I wonder when it happens ,are you charging?

nameite said:
I use to get that problem on stock and some versions of CM.
Was definitely a software problem for me, havent had that problem since I'm on nightlies.
Click to expand...
Click to collapse
What nightly version are you using?
The problem happens even if i'm not charging...

[Q] Broken Phone - Strange Symptoms

After two years of use my Desire HD has developed some strange problems after I dropped it. The volume rocker does not work, the WiFi and bluetooth dont work and finally the strangest problem, that the keyboard does not come on when you want to input text for any App. The screen and touch input work without fault, scolling and selecting icons without problem. Making phone calls and internet connection seems to be OK as well.
I suspect I have damaged the motherboard or some other hardware, so before I buy a new phone I was wondering if anyone else had any of these problems and if so was it easily fixed.
Cheers

zen_hamster_lid said:
After two years of use my Desire HD has developed some strange problems after I dropped it. The volume rocker does not work, the WiFi and bluetooth dont work and finally the strangest problem, that the keyboard does not come on when you want to input text for any App. The screen and touch input work without fault, scolling and selecting icons without problem. Making phone calls and internet connection seems to be OK as well.
I suspect I have damaged the motherboard or some other hardware, so before I buy a new phone I was wondering if anyone else had any of these problems and if so was it easily fixed.
Cheers
Click to expand...
Click to collapse
i knw this may sound strange but try flashing another ROM first,worth giving a try..

I did as you advised, which fixed the keyboard problem. The other faults are still evident so I guess I have damaged some hardware or cable. At least I can now use the phone to text message.
I will have to have someone take a look at the inside of the phone. Checked a diss amble video out and it looks complicated.
Sent from my MZ604 using xda premium

Nice to hear tht wht else is broken now.
Sent from my HTC Desire HD using xda app-developers app

Touchscreen problem

My phone touchscreen is not working whenever the screen backlight went off and whenever the screen is lock. It again works for sometime after rebooting or flashing stock rom and the same problem starts again. I have also updated my touchscreen firmware but it doesn't solve the problem. Please help me. Please. Don't tell me to go to samsung care coz my warranty period is over and there is no samsung care centre at my place.. Otherwise, I have to say good bye to my Galaxy y from today. Please, please, please help me.
Sent from my GT-S5360 using xda premium

You have done everything that's i would have told you - flashed stock , updated touch screen fw !
And i can't tell you to go to ssc
Anyway lemme just get some answers first :
Did this problem begin all of a sudden at random or do you remember doing anything that could have caused it ?
Also you sure the digitizers are okay ? You on stock 'kernel' right ?

nikufellow said:
You have done everything that's i would have told you - flashed stock , updated touch screen fw !
And i can't tell you to go to ssc
Anyway lemme just get some answers first :
Did this problem begin all of a sudden at random or do you remember doing anything that could have caused it ?
Also you sure the digitizers are okay ? You on stock 'kernel' right ?
Click to expand...
Click to collapse
It happens suddenly. What do you mean by 'digitizers'? Yes, I am on stock kernel. Waiting...
Sent from my GT-S5360 using xda premium

Its too technical you can Google to know more - simply a digitizer is an interface that converts analogue inputs to digital ones - they are the main component of your capacitive or any other touch screen .
I know this because recently i had a similar touch screen problem but not entirely like yours as mine wasn't working at all no matter you reboot or lock - and i had to get the digitizer replaced to get things back to working

nikufellow said:
Its too technical you can Google to know more - simply a digitizer is an interface that converts analogue inputs to digital ones - they are the main component of your capacitive or any other touch screen .
I know this because recently i had a similar touch screen problem but not entirely like yours as mine wasn't working at all no matter you reboot or lock - and i had to get the digitizer replaced to get things back to working
Click to expand...
Click to collapse
Where can I get the digitizers? Any idea how to replace it?
Sent from my GT-S5360 using xda premium

thadoukuki said:
Where can I get the digitizers?
Sent from my GT-S5360 using xda premium
Click to expand...
Click to collapse
Google you'll fine plenty but make sure that its a digitizer problem before repairing ! Yours sound like some kind of bug to me as touch doesn't respond after back light goes off and works fine all other time .
Maybe someone else will have better solution wait

try that when u are on stock (rom, kernel, etc)...
just dont install any app...
try if for a time..
nd tell if the problem is still there
rooting is new for me...and i am noob to root...

Touchscreen problems

So I am having this problem since 4.4.3 and 4.4.4 update. Once or twice a day the screen won't respond to touch. Should I use a custom kernal or this might be a hardware problems.
Sent from my Xperia U using XDA Free mobile app

Ameer Shimoga said:
So I am having this problem since 4.4.3 and 4.4.4 update. Once or twice a day the screen won't respond to touch. Should I use a custom kernal or this might be a hardware problems.
Sent from my Xperia U using XDA Free mobile app
Click to expand...
Click to collapse
How do you fix it when it happens? Do you have to restart? Does the touch fail or does the tablet freeze?
Honestly not very sure what you could do, besides maybe trying a factory reset? That would work if a software problem.
What about cleaning it and removing any screen plastic guard.

U can say it freezes then I have to restart it. This is happening after two factory resets.
Sent from my Xperia U using XDA Free mobile app

Firmware fix: http://forum.xda-developers.com/showthread.php?t=2428133, read and follow the op very carefully.
...if it does not help, or you think it may be internal:
http://forum.xda-developers.com/showthread.php?t=2535835

mdamaged said:
Firmware fix: http://forum.xda-developers.com/showthread.php?t=2428133, read and follow the op very carefully.
...if it does not help, or you think it may be internal:
http://forum.xda-developers.com/showthread.php?t=2535835
Click to expand...
Click to collapse
OK I'll try..
Sent from my Xperia U using XDA Free mobile app

Same issue here, I think.
Just purchased a refurbished Nexus 7 (official factory refurbished) from Amazon. My touch screen works great for a day or so, but eventually touch stops working altogether and sometimes requires a hard-reboot (holding the power for 10-seconds). Downloaded a touch screen test app which works great (even with ten fingers on the screen), tracking well on all parts of the screen. It's just like the touch atrophies over time until it stops working.
First thing I did to the tablet after getting it was to unlock the bootloader and load stock/rooted 4.4.4. Is there some way to update the touchscreen firmware that I'm missing?
I don't want to open this thing up and muck with the hardware for fear of damaging it. I'm holding out hope that there is a software fix, because rebooting fixes it right up.

nebhead said:
Same issue here, I think.
Just purchased a refurbished Nexus 7 (official factory refurbished) from Amazon. My touch screen works great for a day or so, but eventually touch stops working altogether and sometimes requires a hard-reboot (holding the power for 10-seconds). Downloaded a touch screen test app which works great (even with ten fingers on the screen), tracking well on all parts of the screen. It's just like the touch atrophies over time until it stops working.
First thing I did to the tablet after getting it was to unlock the bootloader and load stock/rooted 4.4.4. Is there some way to update the touchscreen firmware that I'm missing?
I don't want to open this thing up and muck with the hardware for fear of damaging it. I'm holding out hope that there is a software fix, because rebooting fixes it right up.
Click to expand...
Click to collapse
Look 2 posts up from yours.

mdamaged said:
Look 2 posts up from yours.
Click to expand...
Click to collapse
Oops - I looked at the link to the hardware fix, but not the firmware fix. Thanks, I'll give this a try first.

Firmware fix above seems to have alleviated the issue for me. At least I haven't seen the issue over the last several days, which is good news. Hopefully that holds up over the long term. :good:

LG G4 Touch Screen issues. Ghost Touches?

I've been able to replicate this issue on my G4 (815T Australian model) on a daily basis, just on the instagram app though.
I recorded a video of it. Slowmo part shows the issue
https://goo.gl/photos/F823e125PQckCPLp6
The screen seems confused and it just scrolls the other way even if my thumb wasn't touching the screen.
Factory data reset did not fix anything.
Are you able to replicate this LG G4 owners?

I don't use Instagram, so can't help with that app, sorry.
But if you go into Developer Options, and turn on "Show touch data", it might help add some more info to the discussion. It will show a trace on the screen of what the phone's touchscreen interpreted from your last tap/swipe.
It would presumably show a swipe up, and then back down, when you're getting these ghost touches that change the scroll direction. But perhaps it could also help show if swipes are interpreted the same way in other apps. It might help you learn a little more about what the phone is seeing, at least.

Thanks for the video and everything but why a new thread? Plenty of videos on the main thread.
Is another thread really necessary?
Sent from my LG-H811 using Tapatalk

Might be, because this only happens with IG. I've got the exact same problem, only with IG and its very annoying.

shook187 said:
Thanks for the video and everything but why a new thread? Plenty of videos on the main thread.
Is another thread really necessary?
Click to expand...
Click to collapse
Apologies, first time I posted it I was thinking it was just Instagram-specific.

KL643 said:
Might be, because this only happens with IG. I've got the exact same problem, only with IG and its very annoying.
Click to expand...
Click to collapse
Ahh good to know I'm not alone on this!

chobie said:
Apologies, first time I posted it I was thinking it was just Instagram-specific.
Click to expand...
Click to collapse
To me it looks like it is IG specific because I don't have this problem with any other app

You can try to change the touch feedback time from short to medium under settings/accessibility/motor & cogination. This will reduce the touch feedback time. Give it a try, and see if it gets better.
Sent from my iPad using Tapatalk

alanchai said:
You can try to change the touch feedback time from short to medium under settings/accessibility/motor & cogination. This will reduce the touch feedback time. Give it a try, and see if it gets better.
Sent from my iPad using Tapatalk
Click to expand...
Click to collapse
Done that but it doesn't solve this problem.

chobie said:
I've been able to replicate this issue on my G4 (815T Australian model) on a daily basis, just on the instagram app though.
I recorded a video of it. Slowmo part shows the issue
https://goo.gl/photos/F823e125PQckCPLp6
The screen seems confused and it just scrolls the other way even if my thumb wasn't touching the screen.
Factory data reset did not fix anything.
Are you able to replicate this LG G4 owners?
Click to expand...
Click to collapse
Question, do you have Google keyboard installed? Because I just removed Google keyboard and installed SwiftKey and it looks like the problem is gone....

KL643 said:
Question, do you have Google keyboard installed? Because I just removed Google keyboard and installed SwiftKey and it looks like the problem is gone....
Click to expand...
Click to collapse
Nope, I use Swiftkey from the beginning. Only LG stock keyboard is installed.

Mm, I've got LG keyboard freezed with TB and after changing from Google keyboard to SK, the problem is gone

KL643 said:
Mm, I've got LG keyboard freezed with TB and after changing from Google keyboard to SK, the problem is gone
Click to expand...
Click to collapse
Interesting. Not keen on rooting though. =\
So you reckon it's just a software issue?

chobie said:
Interesting. Not keen on rooting though. =\
So you reckon it's just a software issue?
Click to expand...
Click to collapse
Well this problem is only related to the LG G4 and IG for me...I don't have any other touchscreen problems with this phone. So for me I guess this is not hardware related. During the day I just had 2 small "ghost touches", way better than before. Will see how it goes the next few days...
Edit :
after a view days, it looks like it didn't solve this issue. Today I notice the ghost touches were there again in IG

Force GPU rendening under Developer options somewhat helped.
The new v10f on my Australian G4 didn't fix the issue as well.

Any updates on this? I had same issue. N this is a replacement unit after 2.5 weeks of waiting
Just day one and this ghost touch come up.

I also have this problem
Did you solve the problem?

I am facing similar issue.between...i am not using ig.

I've had this issue as well (not just IG) and sent the phone back for servicing. It was sent back to me with a report showing that they'd done a few things but the problem is still there. I'd been thinking I'd send it back in once more and ask them to have another look. I'm getting ghost touches everywhere and quite a bit, it's very annoying.
Someone mentioned there was another, large thread about this issue but I can't seem to find it, can anyone point me to it?

Hi, I posted this in a new thread yesterday as I couldn't find anything. Never thought to search for 'ghost taps' duh.
Every now and then when just doing normal things on the my phone it totally freaks out and all by it self it suddenly starts to tap random parts of the desktop, slides the pages, opens apps, closes apps, goes into calculator and a bunch of buttons are pressed randomly. It's almost like someone has hacked my phone and is trolling me by just tapping randomly on the phone.
Just today when looking at Facebook it closed the app, scrolled down notifications, data was turned off and wifi turned on.
I thought it might have been my screeen protector, bit of moisture in it or something. Took that off and still does it. Took out the battery for a minute and still does it.
It happened a few months ago then nothing for ages and now it's started again this weekend.
Thought it might have been only when connected to data but has now done it when offline.
Any one got a solution? Does a custom rom fix?