Help! LG V20 extreme lag after kernel crash - LG V20 Questions & Answers

Hello,
Yesterday my rooted LG v20 h990ds got a kernel crash (green screen). I pulled the battery and after that I noticed no difference.
Today I woke up and noticed that the phone was really slow. Somehow the touchscreen was not always responsive so I had to lock and unlock it again.
I couldn't figure out what it was and I thought that maybe it was caused by the root. So I did a factory reset and went back to stock (LGUP). Unfortunately the problem is still there. Does anybody know what it is? Could it be a hardware defective?
Thanks in advance!
edit:
After a few tests it seems to be the digitizer. I've installed an app to test the digitizer.
Sometimes the screen sees a short touch as a long touch. That's why it opens extra options when I try to type a letter.
I've opened up the phone to see if there was any moisture damage visible, fortunately that was not the case.
Is it still possible that this is a software problem? Or do I have to buy a new screen?
edit 2:
The phone is functioning normally again. I disconnected the screen cable and plugged it back in again. Probably it was a loose contact.
This thread can be closed

Related

Touch Response Problem

I have a Sprint Touch [Vogue]. It has served me very well up until recently.
One day, I was using my phone normally when the battery died. No big deal right?
Well, I charge my phone and reboot it. For some reason, Windows is EXTREMELY slow and unresponsive. I figure that something vital had been corrupted by the battery's death, and that it was nothing that a hard reset couldn't fix.
I performed a hard reset.
I let the utilities for the first boot run to customize the phone. Everything seemed pretty much normal. I configured my settings, re-added my contacts, etc. Then I turned the screen off [with the power button].
I turn it back on later to do something. I touch the screen. It immediately and accurately detects the touch's location, but it continues detecting a touch. For 20-30 seconds, after the input has stopped.
It was strange, so I soft reset the device. It booted, with the same problem. So I performed another hard reset. I did some configuration [the response acting normal at this point], and then turned the screen off. Turning it back on brought the same problem back.
This problem still exists on my phone, even after numerous hard resets and even ROM flashes.
A better description of the problem: When the device is first turned back on [meaning brought out of standby], its touch response is messed up. It will immediately and accurately detect any touch input, but it will continue to detect the input for up to 30 seconds AFTER it has been released, as if you were holding it the whole time.
WHY is this???? My phone is almost unusable because of this!!!! I can still place/ receive calls, using the navigation buttons and the red and green buttons. But the touch response is screwed!
Can someone please shed some light on this problem I'm having?
Phone specs: Windows Mobile 6.1, HTC / Sprint customized. Minimal third party software is currently installed.
[I've already determined that third party software is not the problem, because i haven't installed any!]
Possible solution
Hi,
today I experienced something similar to your description - no touch response when I tried to pickup a call. The strange thing is that last night everything was working and no settings were modified nor programs were added/removed. The screen suddenly 'died'. At the moment I am using it through a program MyMobiler which brings the mobile display to the PC and I can use the mouse to control the phone (it is like VNC for the phone screen, the phone is connected with ActiveSync).
This is temporary solution untill I finish my backups of files, programs, settings. I didnot performed hard reset yet, hope this will solve my problem
In the following link there is a 'magical' solution - to remove the screen protector:
http://www.htcwiki.com/thread/1112981/LCD+or+Touch+screen+not+working
P.S. I had removed the screen protector and voilá - the screen is now touch responsive. The root cause of the problem obviously is the dust between the screen and the protector which results in constant screen pressing - and as a result no accepting my finger presses.
I hope this will work for you and others with similar problem.
I had a similar experience with an old Vogue.....In my case, there was no battery death precursor, but it just started acting up. Not too long thereafter, I noticed the screen/digitizer was forming what looked like an air bubble between the digitizer and the LCD on one place of the screen. The screen was becoming defective. I eventually had to buy another Vogue from a friend who didn't have a clue of the 6900's potential, and didn't want his anymore, so I got it cheap.
Sounds like your screen/digitizer may be on it's last leg.

HD2 Touch Screen Not Responding

Hi Guys i hope somebody who knows about capacitive touch screens can help me! I have taken my HD2 apart to fix a smashed camera lense. On removing the back cover i used a small screwdriver to prise off the back case and unclip it all round. It came off with no problem, i fixed the camera and put it back together. When i turned the device back on the touch screen isn't responding to my finger on any screen. Like i turned the touch screen off! The hard buttons still wok but nothing from the screen. Nothing looks damaged (I.e the glass isn't smashed). I seem to think i might have damaged something when prising the cover off with the screwdriver. Please, any suggestions would be really helpful!!!
Can anybody out there help with this? I am currently without a phone :-(
I have exactly the same problem, but it happened from nowhere. I didnot unscrew anything. Please Help
Check the flex cable.. this part are very delicate.
is this :
http://img.diytrade.com/cdimg/92507...creen_Full_LCD_for_HTC_Touch_HD2_HD_2_LEO.jpg
same problem
ive got the same problem, mine just stopped working, i performed a soft and hard reset, removed the battery still nothing. it worked for a moment but once locked it stopped working again, only the hard buttons.
same problem but it works on and off. basically the screen will respond until the phone is put into hibernate. the after that id have to push the phone button and end button back and forth until it responds
Same Issue independant of ROM
Same issue here.
Funny thing is it started a week or two ago randomly out of the blue.
Same scenario:
lock the phone can't get touchscreen to respond for unlock
Judging by these posts everyone started seeing this about the same time, maybe it's a software issue or background app .
Help!
I have same problem. It can work for a couple of hours or in 1-2 days then just stop responding, almost every time when in hibernate. Lets just hope it's not hardware failure.
This started happening to me this morning. Out of 50 tries, managed to unlock the phone three times only. This happened out of the blue, right after i removed my phone from the charger.
Have soft reset, hard reset, reflashed ROM, but the issue still remains.
I really really hope this is not a hardware issue.
Does anyone out there know how to solve this? My phone is virtually unusable right now...
Same problem here, I've been testing for about 2,5 months now and today I've sent mine back to HTC . I think it's a hardware problem, tried everything from hard resetting to reflashing. When I press the HTC logo and keep it pressed the screen does respond again. Conclusion: hardware problem.
dio62000 said:
Same problem here, I've been testing for about 2,5 months now and today I've sent mine back to HTC . I think it's a hardware problem, tried everything from hard resetting to reflashing. When I press the HTC logo and keep it pressed the screen does respond again. Conclusion: hardware problem.
Click to expand...
Click to collapse
You're probably right.
I've also tried everything. But kind of strange that if I lock when not on home tab it seems to work. And the screen, almost always, reacts as it should as long as I just dont' lock it.
I just started to get this issue. touch screen works fine until it hibernates. reflashed, still happens. found this in my search:
htcphones.net/htc-hd2-problems-with-touchscreen/
just got off the phone with tmo. they are sending me a new one.
Yeah, it happened to me as well. I opened a new thread like a month ago explaining the problem: http://forum.xda-developers.com/showthread.php?t=710282&styleid=15
and I contributed in another one concerning the same issue here: http://forum.xda-developers.com/showthread.php?t=708530
Summing all up, it ain't caused by a software or a ROM of some kind (at least in my case) because soft and hard resets didn't solve it nor did the flash of a stock ROM. The most probable cause is a digitizer (touchscreen) defect that appears randomly and totally out of the blue. The only thing to do in my opinion is to send the phone in for repair, which I did. It came back with a check mark on "calibrated screen" checkbox. As of now phone's working fine and I hope they solved it even though I read of other people who have had their leo's screens completely replaced..
A curious side note: htc care reset to zero my phone's call duration timers..
I'm not sure if it's the screen. In my case I think it's the connector from the screen to the motherboard, because pressing the housing seems to help.
But let's see if HTC is able to repair it, I hope they are, because the problem is so random they might not even see it
After losing functionality on my touch screen for a week, finally decided to send it in. Took the trouble to revert my HSPL to original and Stock Rom.
Repair should take about a week. Now I'm stuck with an ancient Nokia 6230i for this week. I feel so lost without my ppc. Have had one for as long as I can remember.
Hopefully the phone comes back okay...
I've had so much problem with the screen not responding so I did all backup then reflashed, hard reset to put the device back to stock. Did this during the weekend, I even fired up my old iphone 3g to have as backup phone.
All set today to go to the store and have it repared under warranty.
But since Sunday evening it works perfect. I've been testing it a lot and the screen has not stop responding even once.
This might be just temporarily but does anyone else experienced something like this?
Mine sometimes worked well for hours... days... but eventually the problem came back.
Mine died on me when I was actually out of the country (stuck in Vietnam without a phone). It would work for 5 minutes, then stop for hours. I would have to switch my phone on and off for a couple hundred times before it worked for another 5 minutes...
Got so tired of it that i sent back my HD2 for warranty repair. Expect it to be back tomorrow (or Friday at the latest). Hope there's no further problems with it.
I hate to say it, but the HD2 is known for its highly defective touchscreen. Even when it's working, a lot of people experience strange and bothering events, such as the touchscreen "touching" itself, a very high/very low screen sensitivity all of a sudden, the tilting of the screen to one of the four corners of the device and so on and so forth.
With a device so expensive one would expect it to work flawlessly. Seems to me that HTC doesn't think the way we do...

[Q] Screen problems after flash

Hey all. My G2 was hard bricked to a point where it didn't even turn on, but with aftabalam8c2's help I could get it to a state where I could flash the phone. I flashed it with a 10b tot image, but after flashing I instantly noticed that the screen has many problems: sometimes it doesn't respond and there are random ghost touches all the time, even when I don't touch the screen. I double checked all connections, made a factory reset, flashed a 20h kdz image and updated touch screen software, but nothing helped.
A week before the brick, I had changed the screen, but everything was working perfectly until the bricking.
I am quite desperate, because the phone is completely unusable right now and I don't know what else to do.
You can see a video of the screen problems here.
Update: I noticed that when I put pressure on a specific point on the left bottom corner of the screen, the screen works normally. Might this hint that the screen is faulty?
Bump. Any help or tips are welcome.
I had ghost touches right after I bought my G2. I tried everything, change rom, kernel, firmware, flash via kdz, everything. I bricked my phone trying to fix my problem and I send it to LG (warranty) . They replace my motherboard and send phone to me. After I turn on g2 problem was back after 20 mins, so I send it again and then they replace my all screen too.
Since then (3 months ago) everything is perfect so I guess you should fix your screen/digitizer.
Thank you for the tip. I was already thinking it might be the screen, although it worked perfectly before I bricked the phone. Sadly I don't have a replacement screen at hand, but I sent a message to the screen seller, asking for a replacement. Now I just have to wait and see.
Interesting is that my phone was off for a few days and now, after turning it back on, the ghosting is almost gone, but some spots on the screen are unresponsive or oversensitive.
Edit: I made a touch test and found out that there are two large dead zones on the screen. I guess the problem really is in the screen then.
Funny thing is this that I haven't had any dead zone just ghost touches
Sent from my LG-D802 using XDA Free mobile app

Touchscreen issues, touches are wrong, working erronously.

Hey everyone,
I have an LG G2 D802T model, and the touchscreen is malfunctioning after the Lollipop update. I've updated it from LGFlashTool, a KDZ for these models and variants but I've mistakenly selected Europe and Turkish language from the options window that appeared during the flashing progress. I've read at some forums that it should've been South Korea and Korean as the option showed at that window.
The identical issues are :
-When I want to touch the middle of the screen for example, the screen gets and shows it as I'm pressing to bottom of the screen or left side or right side, it just vary.
-Can't get into any section because the screen does not read my fingerprints properly.
-Can't use the phone at all.
So I wonder if that wrong flashing could've caused the problem? I've also had a Samsung brand USB cable and had the process with it (not original LG cable because I did not have it). I've read that wrong cables may cause this problem too, but I've tried to rub the screen with a soft cloth and did not work.
This happened after trying to fix the GPS lock issues by opening the back case, and putting some little papers under some kind of plugs as can be seen on youtube video, but after some restarts everything about touchscreen was fine! Just the GPS was not working properly.
So I've decided to try the Lollipop, maybe it could have a fix for the GPS issues and after flashing the ROM (stock), the screen is kinda dead.
Any helps or ideas will be greatly appreciated!
P.S : I can get into download mode, phone is booting so do I still have a chance?
Thanks in advance.

Touch stop working after turning off and on the screen.

I've been using the PH-1 for a year and a half and its great, but a couple days ago i would unlock the phone via fingerprint (as ussual), it would unlock but the touch wont work, so i factory reset the phone and still the same, remove the case and the screen was loose (almost complete), but the cable was well connected on both sides so i got the screen glued, but still the same.
Im using Android Pie (from day 1) with March update (updated like a week ago), in order to use the phone beyond what Google assistant can do i have to reboot the phone (using power and volume buttons) to get the touch to work again and dont let the screen go off. Sometimes after rebooting the touch works even if i turn the screen off and on, but i think its just luck.
You guys think it might be a software issue? or hardware issue? because i don't live in the US or CA, so i would have to wait a couple weeks for the screen to get here and i would'nt be able to return it in case its not a screen malfunction.
I really don't wanna change my phone, i love the PH-1.
EDIT: i just replaced the screen with a new one from fixez.com and the problem persists, i think april's update broke something. is there something i can do to check the software? Pls help.
I rooted my phone and almost the same thing happens. I turn off the screen and turn it back on and the touch is unresponsive. Howver, ONLY the apps left on screen are unresponsive. I can still pull down from status bar its weird.
Update 1: I saw u mention fingerprinting. I removed mine and somehow it seems to have stopped. I'll use it for about another day or 2.
Update2: Well it doesn't. If my screen times out with an app open. The app is unresponsive upon waking.

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