Digitizer fails after screen swap - General Questions and Answers

This is now my 3rd attempt to find a solution to my problem. My first attempt went unanswered, and although my last attempt got a response, it didn't help me one bit. Unfortunately, I didn't gt a response to my folow up questions either. So, this is going to be a much shorter explanation of my issue. (Previous post has a detailed explanation).
I bought a LG K20 Plus brand new in May. I broke the screen and decided to just buy the same phone and put my logic board into. The problem is, when I did that, the digitizer fails to recognize any touches. Strangely, the digitizer, again, works while booted into TWRP recovery but fails again after normal reboot. I'm so frustrated. I got really excited when my previous post got a response. It was such a huge disappointment to realize that I wasn't going to get the help that would lead to fixing my phone. After over a month and, at this point, my hope was non existent, I decided to just seperate the glass from the lcd and then put the glass on my broken phone. But in looking at it again, I don't see what difference the display makes. I really dont want to risk breaking another didplay. I don't know, it's apparent that I just don't get it. So, here i am again, asking for help. Will someone please tell me what I'm missing. Also, if you have advice please list more then a one sentence solution. I'll need some direction.
NOTE: I'm currently using a mouse via OTG cable and cannot change USB connection from "charge only" to mtp. So connecting to a PC isn't possible for more then charging.

Boot into fastboot and unlock the bootloader. Probably won't help, but why the hell not, right?
Sent from my [device_name] using XDA-Developers Legacy app

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[Q] [HELP] unrooted HTC's touch screen unresponsive, but USB debugging enabled

Hi everyone,
I'm experiencing really wierd behaviour with my HTC Desire S. I'll try to tell the story as it happened, so you may have the best grasp on what's happening to me. Here's the thing: yesterday, I charged my HTC on the wall plug as almost every night (y'all know how it is with smartphones, always needing to be charged ). When I unplugged it on the morining, the green LED stayed on. Not cool. I can't really remember if it was turned on and stuck or already turned off at that time, but I had to reboot the phone. Okay, that can happen, phones have to reboot sometimes.
And then, it did not boot. Instead, it was stuck on the bootscreen. I looked around on the internets, but people seemed to have boot loops or devices stuck after the "quietly briliant" part. Actually, mine was stuck before that part. It didn't even play the funny sound and show the fancy animation: it was stuck on the blank screen with only the HTC logo.
I tried many things, like praying pagan gods and removing the battery, let it cool for a while, boot and wait to see what happens for more than 30 minutes, boot it while plugged on the wall plug... I think I was about to get to the "I'll have to make a factory reset, then" line when I tried to see what dmesg would tell me if I plugged the phone on my computer. Note to self: always try to plug to computer. It did boot completely. The victory dance was almost completed when I was invited to enter my PIN code. My touchscreen did not respond. Damn.
So I had to reboot. Again had to remove the battery (I don't like that, but what choice do I have?). Now it always boots completely (that's a good start), but my touch screen seems completely unresponsive. I can't access anything, can't enter my PIN code or unlock the phone when there's no SIM.
That's where this forum comes in: I've not given up. You see, my phone has USB debugging activated (yeah I know, the thread's title spoiled all the story). I'm pretty sure this means adb can help me in some way to troubleshoot my device. adb shell gives a nice UNIX-like shell, yay, that is relevant to my interests.
My phone has never been rooted. I've looked into it (that's why USB debuging was activated), but I wasn't 100% confident it would work, so I gave up before ending up bricking my phone (duh, too late, haha). It's running the last Gingerbread version distributed by HTC in Belgium (2.3.5, I think, without any certainty), with the last Sense version related (could it be 3.0.3?).
tl;dr: Unrooted phone with unresponsive touch screen, debugging mode enabled, trying to find what's wrong.
So here's what I'd like to know: is there any way to try to force start my touch screen with the help of adb? Where's the related log, the one that should display the error(s) that occur(s)? Should Bill Murray play in the next Batman? If root is needed, do I have a way to use a temproot exploit in order to fix my phone once and for all?
Any attempt to help will be greatly appreciated. This is my first post here, I hope it's clear enough, and not too nooby for you guys. Also, that I didn't break any rule (I watched/lauged at that video about noobs to xda). Btw, I'm quite confortable with UNIX shells, so don't avoid cli-related answers if that may happen to be helpful. Also, I'm not at home right now, but I'll follow this thread with a lot of interest anyways. I'm back on a regular connection next sunday.
Have a nice day! And sorry for the long post (but believe me, I'm even more sorry to admit I can't investigate further on my own, now that is frustrating).
Okay, I'm back.
It makes no sense. I let my phone on for a few days, then suddenly, probably out of boredom removed the battery, put it back and rebooted. I distractingly tried to unlock it… and it worked.
I have absolutely no single clue on what happened. And I'm still quite concerned, because this means it can happen again without any warning.
I'm gonna give a shot at HTC's support in order to ask them what I can do to locate the problem if there are traces. I'd really, really like to read all the logs (and logcat didn't show anything interesting).
If anyone has a suggestion, feel free to shoot it. I'll try to keep this thread updated in case someone has the same problem.
Duh, just got an anwser from HTC's support. Totally useless, they told me to try to reboot in Safe Mode in order to see if the problem happens again. Well, even in normal mode it has not failed for two days. GJ, guys.
I'm really willing to meddle in my system in order to see what could have gone wrong. I'd especially like to see if there is any way to see whether there are HW faults or not, since I'm suspecting a temporary TS chip failure, which can happen again at any moment. I'll be reading some documentation about Android's system and its logs.
Yeah, I know I'm talking a lot alone, but if someone ever has the same problem, he might be able to see what I've gone through, so I'm documenting as much as possible. =)
adb bugreport

Can't turn on or charge...worried

Hi
I think I've killed my phone. I have voided my warranty. Please help/comfort me!
The story so far...flashed stock ROM with ARHD, no problems everything fine. Broke screen in pocket while at work (fuzzy lines across screen), phoned htc to explain problem, they told me to send in for repair but said that the repair would not go ahead if any mods such as custom ROMS had been installed - I told the guy that a custom ROM had been installed (probably my biggest error!). Bought new lcd/digitizer combo from ebay (ukeasybuy), and installed following an online guide (I was very meticulous and followed the guide to the letter with great care). Initially seemed fine but then quickly started doing weird stuff on its own accord, not responding to button/screen touches, would have to press the power button twice to get it to play normal. Yesterday the phone threw a wobbly and crapped out, switched itself off. Tried many times to power on, eventually managed to get into 4ext recovery where I started a restore to earlier nandroid backup, phone switched itself off again after about 20secs through the restore process (battery at this time was at 57%). Now can't seem to power on at all (tried loads of times), no charge light when plugged in, seems bricked.
When installing a custom ROM if you brick your device does it happen instantly or is it something that can develop over time? Only that for a brief period after installation it seemed to be fine, I made sure I had flashed the correct firmware package for the ROM.
I have done some research, but stumped on what to do now...my only thought is that I do have gadget insurance through barclays but wonder if they will just refer me to HTC??
Your thoughts and advice greatly appreciated..
Xenon
Bump
The turning off of the device itself can be a precautionary measure to protect itself. I'm guessing maybe the LCD was installed wrong and is causing a short within the board.
Sent from my HTC Sensation 4G using xda premium
I followed the iFixit guide to install the new screen/digitizer.
As I mentioned I was very careful to follow it carefully, the only extra thing I did was to add some double sided sticky pads inside to stick it back together again as the thin tape supplied was damaged and discarded when taking the phone apart.
Should I try and take the phone apart again and look for any mainboard damage and/or potential areas where shorts may have occurred?
What do you think about the insurance cover, is it worth a shot? what would be the best way to approach the subject?
Many thanks!
Xenon
Maybe you did install it correctly, but there could also be the possibility that the screen is defective. But i would suggest checking the main board for a short.
Good luck
Sent from my HTC Sensation 4G using xda premium
I have taken the device apart again, but no signs of any shorts / problems or anything suspicious. I don't want to spend anymore cash on a new screen without knowing its that that is causing the problem.
Perhaps its one for the scrap heap
talk to whoever supplied you with the screen and tell them you think the screen is defective. say you have installed it to the letter and it is giving you issues. any respectable ebay seller should be willing to hear you out at least. hope youve not left feedback already though as they may think your a chancer :/
Unfortunately feedback was left once I first turned on the phone and the screen lit up. I will give it a try but I won't keep my fingers crossed!
What about the gadget insurance that I have, is it worth trying to get the phone repaired or replaced through them, or will they just send me back to HTC because the phone is less than a year old?

Replacement touch screen unresponsive

I'm fixing an infuse for a friend who needed the screen replaced simple enough job so I thought as I repair phones and electronics as kind of a hobby. However the replacement screen isn't responding to any kind of touch at all. It displays the puzzle piece lock screen and everything else even shows there's been some missed calls ect. yet will not respond to any kind of touch. I think it's a calibration issue but I can't get passed the lock screen so there's no way to change the setting. Honestly I'm most worried about all the media on the phone most (pics, videos, contacts, ect )
If there is a way I can retrieve that off the internal storage I'll feel better about taking drastic measures. Other things I've noticed is an unusualy long boot up time hanging at the white Samsung letters but this is the first time I've dealt with an infuse so I'm not to sure on that.
Any advice is appreciated.
Thanks,
s1im
There are different versions of screens or maybe it was revisions. At least for the LCD +digitizer assembly. Rev.6.1 and 6.2 and 6.3 if I remember correctly.
Edit....here is a link for reference, also two of the screens were interchangeable but not all three. Sorry I don't remember which ones.
http://item.mobileweb.ebay.com/viewitem?itemId=180914982430&siteId=0&isClassified=false
Edit....my statement regarding interchangeability may not be true. The screen I bought could be used as a replacement for two of the rev numbers. That could mean that it is backward compatible but the other one isn't forward compatible.
The link said this item has been removed, but to be clear your saying not all revisions of screens can be used as replacements that you must find out which rev your original screen is?
s1imch4anc3 said:
The link said this item has been removed, but to be clear your saying not all revisions of screens can be used as replacements that you must find out which rev your original screen is?
Click to expand...
Click to collapse
Correct mine had a sticker on it.
Bummer I have no idea what kind of screen she had I threw it away as a jumbled mess is there any other way to find out what screen it was... either way thanks for the replies
Wish I could answer that, but here is another screenshot. It shows one for 6.0/6.1 and another for 6.2 so my original numbers were off. Did the new one say what it is?
Do you know of any way to retrieve the pics and other media off the phone without being able to unlock the screen
s1imch4anc3 said:
Do you know of any way to retrieve the pics and other media off the phone without being able to unlock the screen
Click to expand...
Click to collapse
Just guessing but maybe adb. You could try to edit the title of your thread or start a new one about this question.
Edit..I have an idea but first a few questions , is this phone stock, and would you be comfortable flashing a kernel if it is? This will give you CWM recovery which has mount USB storage as an option in it. All this can be done with the physical buttons, power and volumes.
I found something that may work without having to make software modifications so I'm going to try that first and if not I'll get back to you...
To answer your questions tho the phone is stock and I've rooted /flashed a couple phones with no problems before so I'm OK with giving it a try
Again I'd like to thank you for your continuous help
You should be able to pull everything you need with adb...but the problem is, is adv enabled? And can you pull a whole directory? I doubt you know individual file names for each media file, not to mention that would be a long tedious process as there are likely well over a 100 if not in the 1000s of music/pics/vids
Well..looks like you can pull a whole.directory (sdcard)
this thread may help http://forum.xda-developers.com/showthread.php?t=744454
Btw...you don't have to be rooted to adv pull
Sent from my HTC PH39100 using Tapatalk 2
UPDATE: I took the phone back apart finally after some grueling hours of adb research that lead me almost in circles and found that the replacement LCD is a rev 6.2 and that the revs 6.0/6.1 are the universal more common screens in the u.s. infuse. I decided to return the screen and get the other rev in hope it will be that easy...
I'd like to thank the 2 above members that gave me help especially adfergurson for sticking with me and my ?s I will post back when the next screen comes in to confirm it worked for anyone else needing this as future reference
s1imch4anc3 said:
UPDATE: I took the phone back apart finally after some grueling hours of adb research that lead me almost in circles and found that the replacement LCD is a rev 6.2 and that the revs 6.0/6.1 are the universal more common screens in the u.s. infuse. I decided to return the screen and get the other rev in hope it will be that easy...
I'd like to thank the 2 above members that gave me help especially adfergurson for sticking with me and my ?s I will post back when the next screen comes in to confirm it worked for anyone else needing this as future reference
Click to expand...
Click to collapse
ADB was the first thing I thought of, but flashing a kernel with custom recovery in Odin should allow you to get into USB storage. I am not familiar with the stock recovery but you could see what options are there. I believe it would be from device powered off hold volume up+volume down+ power buttons then release power at Samsung screen.
Were you able to resolve the screen issue with the different version? I am having the same problem.

[Q] Two issues: No touch input/Bricked (APX only)

Hi people,
I'm just looking for a bit of friendly advice really. I know there are similar threads about both of my separate issues but I just want a bit of help weighing up my options.
I've been enjoying my used TF300T ('unwanted gift') for about 6 months and had CM10 running on it. I have had (very) intermittent problems with the touch screen of the type I've seen described on the forum, where it will lose touch input completely but will come back on if you reboot it or turn the screen off/on etc. This has probably happened about 10 times in 6 months, and never persisted beyond a reboot.
Last week, whilst I was away from home and perhaps less inclined to do the proper forum-trawling, I had the problem reoccur but it was persistent. No touch input at all. Perfectly functional within the dock though. I figured the first thing I would try was a factory reset. I booted recovery only to realise that I had the lovely TWRP touch recovery installed and couldn't use it. At this point, I decided that this was very probably a hardware issue if touch didn't work in the recovery or the main OS (though there may be things I don't know that still muddy the water here??).
I opened it up to have a look if there were any cables needed securing etc. At this point, I realised I was definitely on my own because the 'Warranty void...' sticker had already been broken ('Unwanted gift', eh?). I played with the cable a bit and could get it to behave differently but only succeeded in getting 'ghost' input allover the place. I figured that at least it was receiving some input now and crossed my fingers that a factory reset would 'recalibrate' it in some way.
In desperation and not wanting to pay too much in roaming data on my phone, I didn't come here and do the reading I should have done. I just installed CWM recovery and used that to do a factory reset (It's not compatible, it hung, I powered it off and now I've killed my bootloader. No recovery, no fastboot, only APX. I've now read this scenario a number of times on the forum :crying. So, with my excuses made and story told, my questions are as follows:
1) Am I correct in saying this brick is unrecoverable at the minute? (I didn't create the blob.bin I need to use wheelie and get nvflash access. This blob.bin is device specific and I can't unpack it from a cm10 or ASUS download? I think I probably only need to reflash the bootloader, so might not need bricksafe.img??)
2) If I were to have ASUS reflash this, I believe it comes in somewhere below $100 and could be worthwhile if the touch problem is a software one.. Do you think the touch problem is hardware or software?
3) If the screen is a hardware problem, can anyone tell me which part I might need to replace?
4) If it needs reflashing and a part replaced (either by me or an ASUS engineer), should I really be looking at selling this for parts and getting a new one economically speaking? Are any of the parts I have actually useful to anyone?!
Many thanks for reading a long and complicated post. If it cheers you up, the garage also told me my car isn't worth repairing this week!
I believe that you have a hard brick.
Asus can fix it but they normally just replace the motherboard and charge in the region of $250 for this service.
Your device will come back locked and you a lot of people have found the unlock tool no longer works. Probably due to serial not matching MB.
Best option is sell individual working parts on eBay whilst they have some value and you might get $200+ back. Or sell the unit as faulty for $100+
Sorry for the bad news.
Thanks for the input, sbdags. In terms of selling the parts individually, is it just really the screen and digitizer that have any value? ..and the dock, I guess.
asus service have tools to unlock force recovery mode and reflash it but it is easy to said us motherboard replacement to get to much money lol

Digitizer works in TWRP recovery but not after normal boot

I'm new to this forum and this is my 2nd attempt to get help to solve my problem. I have read ALL the rules posted in the XDA New User Guide - Getting Started On XDA, as well as all of the linked pages that are suggested to read before posting. It was very informative but I'm more confused then ever about the right place to seek help. This is all very overwhelming and I'm afraid I'm going to say something to offend someone or post in the wrong place and get in trouble, or worse, ignored. I suspect I did just that in my last post because I never got a response. I apologize in advance if I have done something wrong.
Ok, I'll do my best to explain my problem. I have an LG K20 Plus (I'll refer to this as my original phone) that I bought, brand new, from T-Mobile in May. In August I cracked the screen but continued to use it because besides the crack, it worked fine. By September the crack had worsened significantly and I decided to replace the outer glass as I had successfully done that with my older LG G3.
In that process, while trying to get that dreadful glue off, I scraped off some of the black stuff under the glue on the LCD which caused a white spot, about the size of a 1/2 dollar, on my screen. Although it was bothersome, the phone itself still worked fine. I continued to use it while I searched for the easiest way to fix it within my budget. After reading posts here and realizing it would work, I bought a used LG K20 Plus (I'll refer to this as my used phone) with a bad esn. The plan was to put my original logic board into the used phone and be on my way. That didn't happen.
When the used phone arrived, I turned it on to verify everything worked. I then put my original logic board into the used phone and turned it on. I saw my orignal wallpaper and was so happy I had my phone back. Then I tried to swipe to unlock and nothing happened. I booted it up a couple more times and still nothing. I connected a mouse via an OTG cable and verified that there were no more obvious issues with the phone except the digitizer. To confirm the dispaly wasn't faulty on the used phone, I put the used logic board back into the used phone it came with and booted it up. The digitizer was back to working again. I ran through as much as I could on a locked phone and the digitizer worked like new.
I, carefully, put my original logic board back into the used phone and, again, no touch capability. Again, I researched this problem to no avail. I realized I was way over my head and I decided to ask for help instead of making things worse by trying to fix it without knowing what I was doing. So, I put the phone in a drawer and asked for help here. That was a month ago. I know you are all very busy and, like I said earlier, I'm sure it's my fault and I messed up somewhere because my post didn't receive any replies.
I can't use my original phone because I have no touch ability and I can't use the used phone because it has an esn lock. At this point I decided to try and (I'm sure I'm using the wrong terminology here) flash the used phone and root it to bypass the bad esn lock. After researching that and seeing the word "illegal" A LOT, I decided I just didn't know if it was legal or not, so I decided to not take the risk of doing something that may get me into trouble.
At this point I decided I didn't have much to lose so I backed up my original phone and, with only the display of the used phone attached, I started the process of flashing it with TWRP and rooting it via this guide https://forum.xda-developers.com/android/development/recovery-twrp-v3-lg-k20-plus-t3616248 So, it is now successfully rooted but it still has no touch ability. The really weird thing is, while I was in TWRP Recovery mode, the touch ability worked again. But as soon as I rebooted the phone into regular mode, the digitizer stopped working again. I'm so confused and I don't even no where to start looking because I can't define the problem or the exact thing that is failing. I don't even know if it's hardware or software related.
So, I guess my question is, does anybody have any experience with this kind of problem you could share with me. I'd settle for someone being patient enough to explain to me exactly what is going on so I could research it better myself. Asking for help was not my first step. I have been looking and looking for 6 weeks now. I'm way out of my league with this stuff. It's really difficult to find a solution to a problem you don't quite understand. It's a little bit like being told to look up a word in the dictionary to find the spelling.
*LG K20 Plus
*LG-TP260
*T-Mobile
*Rooted
Baseband: MPSS.JO.
2.0c1.2-00012-8937_GENNS_PACK-1.85468.1
I think it's my original ROM
Kernel Version 3.18.31
I flashed TWRP
USB debugging enabled
OEM Lock Off
Here is what you do. Hook it up to a pc. Take a logcat and that will tell you what is failing. It sounds like a kernel compatibility issue.
zelendel said:
Here is what you do. Hook it up to a pc. Take a logcat and that will tell you what is failing. It sounds like a kernel compatibility issue.
Click to expand...
Click to collapse
I'm so sorry but I have run into a few problems .. firstly, on my phone I have to use a mouse connected via OTG cable because I have no touch ability and my usb connection is set to "charge only". Apparently you can't change that until the phone is plugged in and obviously I need the mouse so I can't connect to computer. I downloaded an app called LogCatX and made a log file but I don't know how to attach a file and when I copy/paste it into the reply it says it is too long and reduce by 30000 characters. Any advice?
HelpNeededPlz said:
I'm so sorry but I have run into a few problems .. firstly, on my phone I have to use a mouse connected via OTG cable because I have no touch ability and my usb connection is set to "charge only". Apparently you can't change that until the phone is plugged in and obviously I need the mouse so I can't connect to computer. I downloaded an app called LogCatX and made a log file but I don't know how to attach a file and when I copy/paste it into the reply it says it is too long and reduce by 30000 characters. Any advice?
Click to expand...
Click to collapse
I think the new touch screen will need a calibration.
PS: i liked how you explained your problem
Sorry for my confusion but I'm not sure if you were telling me what I should do to figure out where the incompatibility issue may be or if you were asking me to upload the catlog so you could look at it and help me. I don't know what a catlog is, nor how to interpret it. At any rate, 6 hours later, I have, finally, figured out how to upload a file. :victory: I've been looking at how to fix a kernel incompatibility issue and I've read you can flash a custom kernel. If I did something like that, would that resolve my problem. Are they specific to the version of operating system your phone has (ie nougat, marshmallow etc) or do you need to use one for your specific phone model? Would flashing a custom ROM do the same thing? And is that model specific or OS specific? Where would I go to find something like that?
NOTE... In looking for differences in my phone to try and figure out where this kernel compatibility issue might be, I noticed that there are two different numbers on the midframe of my phones. I don't know if this means anything. I'm just trying to help someone help me.
zelendel said:
Here is what you do. Hook it up to a pc. Take a logcat and that will tell you what is failing. It sounds like a kernel compatibility issue.
Click to expand...
Click to collapse
Hello? Was this the extent of your help? I'm not sure if you were asking me to run a catlog to upload so you could help me figure out what was wrong or if you were just telling me what to do and then moving on. Because if it was the later, all you've done is piled more stuff on my steadily growing mound of confusion. To make matters worse, my posts is showing as getting a response, so, I fear, nobody else will look at it and I will be left in the same place as before. If someone happens upon this post, could you give me advice that will actually help me solve my problem, along with instructions on how to do whatever I need to do. Thank you in advance. Until then, I'll be anxiously awaiting your reply....

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