Database Users

[Q] Screen replacement

I recently bought a new screen glass touch digitizer for my Defy (because the old one was destroyed) and I try to replace it.
I follow the instructions and i think I have connected with success the new touch digitizer with the motherboard, but when I turn on the phone it doesn't working. No touch response. It seems like it isn't connected and is very strange :S
I wanted to ask if this problem might be caused becase I am on CM10. If i flash stock sbf would be this fix the problem?
Looking for some suggestions or ideas how to fix this please.
Thank you in advance

old digitalizer works ? (at least one part:silly
Maybe the new digitalizer is broken ...

lexer98 said:
old digitalizer works ? (at least one part:silly
Maybe the new digitalizer is broken ...
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Click to collapse
Yes, the old one is "working"... how can I test if the new one is broken? I can't see anything strange on it :s

I also had to replace mine. Also in CM10 and it works. The screen is a capacitive screen. This means that capacity across the contacts changes as you touch it so you can in theory measure it with a capacity tester (e.g. a multimeter). Problem is practice. You'd need to find a connector to attach your multimeter. Quite impossible. As the screen cost me just €5 I'd suggest go and buy another one and see if that works.
Sent from my MB526 using xda app-developers app

[Q] Touch screen doesn't work...now what?

I dropped my phone and cracked the screen. So since I've did that, the touch screen doesn't work. I went to get the screened replaced and went to test it out and it still doesn't work. What's not allowing my touch screen to work after getting the screen replaced? If I change the screen does is the digitizer attached to the screen so therefore it will get changed too or is it a separate hardware?

Most likely faulty replacement part.

Try downgrade to 4.2.2
DrFredPhD said:
Most likely faulty replacement part.
Click to expand...
Click to collapse
Hi, I've purchased a cheap diplay at ebay. Touch didnt work any more.. after a number of tests i found out this was due to a HW test at boot. When downgrading 4.2.2 everything works fine. Any upgrade 4.3+ failed to enable digitizer after reboot.
PS: When booting eg 4.4.4 with the old digitizer connected and then connect the new digitizer w/o rebboting the the touch was working well.. I'm very interested in geting a confirmation or reason what causes this issue kindly keep me posted

Most replacement screens use an original LCD (recycled from a cracked screen) fitted with a copy touchscreen. Either the incompatibility could be deliberate on LGs part but I think it's probably due to a driver update or something which has broken compatibility with the reverse engineered touchscreen. It could also be a coincidence, some copy parts are prone to just not working for no real reason sometimes.

Hey DrFredPhD
Can you imagine a costum rom with the old touchscreen drivers from 4.2.2 into 4.4.4?
What would this require: To compile a costum kernel? The drivers would usually be in compiled form in the boot.img, right?
I've tried to flash 4.4.4 with the old boot.img from 4.2.2. - but the phone didn't start (as expected..)
Can you imagine someone how could help me in this regard? I think there may be a number of people facing the same problem..
Anyway, thanks for your help - Greetings :good:

Binaries are available for nexus 4, maybe compiling from AOSP with older binaries would work, but you might break functionality too.
It's been done on other devices but probably not for the reason you want.
https://developers.google.com/android/nexus/drivers#makojdq39

So what are you essentially saying? Put the mb in a good working nexus and see if it works or that maybe the tech put a new digitizer with the old rom driver onto an older mb with a new rom driver? And that could possibly cause conflict with drivers or roms? Which in turn will not allow my screen to function?

The part he put on is crap, if you put a decent replacement screen on it'll work fine.

DrFredPhD said:
The part he put on is crap, if you put a decent replacement screen on it'll work fine.
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Click to collapse
Are you sure? Because I don't wanna regret spending money on a new screen and it doesn't work. :laugh:

I've seen phones damaged by a repair bad enough that the touch will never work, but I've seen far more copy touchscreens that are useless.

Hi Guys
Just to say: may bad fake faulty touch "per se" works well under 4.2.2 and updated 4.4.4 also! It just prohibited "start" the phone with this digitizer attached! Both, phone and digitizer are fully functional and "compatible"..

LG G2: Screen Flickering

[HELP] LG G2 screen flickering
Hi everyone,
As the title said, i have been suffering for more than 4 days from Screen Flickering, i tried every possible solution in XDA but still out of luck, the issue happens with stock (rooted and none-rooted) ROM, AOSP, CM Roms, in recovery, download mode, even while flashing new Rom, my phone is out of warranty and i am afraid that this is not a Hardware fault as some people mentioned before, so a screen replacement may not be the right solution.
Any help would be appreciated.

Please anyone can help!

S!LeNT J0cK3R said:
Please anyone can help!
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Click to collapse
Can you boot your phone? What does the screen flashing look like? Colors?

Damaged connector for LCD (flex cable or LCD), i had flickering and glitching because these two were damaged

Mashed_Potatoes said:
Damaged connector for LCD (flex cable or LCD), i had flickering and glitching because these two were damaged
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Ah alright, well glad you figured it out! Good luck fixing it!

Mashed_Potatoes said:
Damaged connector for LCD (flex cable or LCD), i had flickering and glitching because these two were damaged
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So you think this is not screen related, because i don't want to spend lot of money to change my screen and have the same issue

Mashed_Potatoes said:
Damaged connector for LCD (flex cable or LCD), i had flickering and glitching because these two were damaged
Click to expand...
Click to collapse
S!LeNT J0cK3R said:
So you think this is not screen related, because i don't want to spend lot of money to change my screen and have the same issue
Click to expand...
Click to collapse
Well it depends, it probably is a hardware issue but I don't know if you've accidently changed some settings under devloper options. There are some settings in there that cause the screen to flash. If you can boot up and check the settings, read through them and see if you have accidentally clicked any of them.

S!LeNT J0cK3R said:
So you think this is not screen related, because i don't want to spend lot of money to change my screen and have the same issue
Click to expand...
Click to collapse
You could try changing the flex cable, its a cheaper part. (20$-30$)

bigdaddysmallmomma said:
Well it depends, it probably is a hardware issue but I don't know if you've accidently changed some settings under devloper options. There are some settings in there that cause the screen to flash. If you can boot up and check the settings, read through them and see if you have accidentally clicked any of them.
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Click to collapse
Bro, this issue is happening to me even on a fresh stock Rom (4.4.2 and 5.0.2), even on recovery or while flashing a new Rom the screen keep flickering, so i's absolutely not software related.

S!LeNT J0cK3R said:
Bro, this issue is happening to me even on a fresh stock Rom (4.4.2 and 5.0.2), even on recovery or while flashing a new Rom the screen keep flickering, so i's absolutely not software related.
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Click to collapse
Alright well I asked earlier exactly when it was happening and you didnt answer so I was just guessing, but if you know it's hardware try the cable replacement

Mine got that problem too. I had to put some pretty thick (about 1mm) double-sided tape between both 2 display (I guess) connectors and plastic screwed shield.
It's my third day without flickering screen since the fix.
I hope it'll help

My LG G2 D802 'KNock On ' NOT WOrking!!!!

hello, my device is : Lg g2 D802 (uk)
Kitkat 4.4.2 (stock)
(unrooted)
My screen broke and i have replaced full LCD and digitizer. But now Knock ON is not working, but knock off still works fine. Could there be a problem with the sensor? Wont the knock off not works too if anything is wrong with the sensor (even tho it works fine)?? So, Any help would be very useful for me , so knock on feature could work... Thanks Very Much to all
P.s. Ive have tried the Firmware update and all not working, and pls Do Not tell me to 'READ' more. I have been reading and couldnt find any answer for my KNock On to work. Thanking you:angel:

all what i know that knock off is software and knock on is hardware so your problam maybe from new screen

amin44 said:
all what i know that knock off is software and knock on is hardware so your problam maybe from new screen
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yeah maybe. I do replace it with Non-uk version but still D802. Could it also be that i havent remove the screen covers like the plastic transparent covers that sticks to the screen even tho touch and all still works? But the knock code still works tho.

Have you calibrated your touchscreen after replacement ?

briskspirit said:
Have you calibrated your touchscreen after replacement ?
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Click to collapse
yes i did quite a few times, still doesnt work

Screen replacement - ONLY AFTER STANDBY: stripes on the screen

Hello,
I replaced the screen of my G2: https://www.youtube.com/watch?v=yGZDcDyg2e8&feature=youtu.be
After starting the phone, everything works perfectly (normally) but after using the standby mode, only stripes are displayed and the phone is unusable. Anybody has an idea, why and if it is possible to solve the problem? Or is the new screen just broken, what I suppose.
https://docs.google.com/file/d/0B68gR5w5oZoTNUZvM1pDTkhBRFU/edit?usp=docslist_api

Shynepo said:
Hello,
I replaced the screen of my G2: https://www.youtube.com/watch?v=yGZDcDyg2e8&feature=youtu.be
After starting the phone, everything works perfectly (normally) but after using the standby mode, only stripes are displayed and the phone is unusable. Anybody has an idea, why and if it is possible to solve the problem? Or is the new screen just broken, what I suppose.
https://docs.google.com/file/d/0B68gR5w5oZoTNUZvM1pDTkhBRFU/edit?usp=docslist_api
Click to expand...
Click to collapse
Just replaced my display too and I have the same issue. Thing is I'm going throught the second display that acts like this after replacement. My guess would be, that there is an issue related to the different screen models. I assume (and am going to try) that a ROM reflash already helps.

Yes, could be!!! Because some shops tell you from start that those displays don't work with Android 4.xxx but i also have a doubt because , i have the same issue when i am in the recovery mode (which is kind of an independent os in my opinion, - though than a kernel update still might help in theory)
Which version do u have?
I'm very angry with the shop though, because I asked if it works with Android 4.xxx
The screen also has a physical damage. It's cracked. Neither the glass isn't attached well to the frame .
I brought it on ebay from the_phone_depot
please inforn me , when you have tried out something new.

Shynepo said:
Yes, could be!!! Because some shops tell you from start that those displays don't work with Android 4.xxx but i also have a doubt because , i have the same issue when i am in the recovery mode (which is kind of an independent os in my opinion, - though than a kernel update still might help in theory)
Which version do u have?
I'm very angry with the shop though, because I asked if it works with Android 4.xxx
The screen also has a physical damage. It's cracked. Neither the glass isn't attached well to the frame .
I brought it on ebay from the_phone_depot
please inforn me , when you have tried out something new.
Click to expand...
Click to collapse
I can confirm that this is the case. A reflash helped. I'm using Resurrection remix. Shouldn't matter what ROM tho.
Buuuut: I didn't have the issue in the recovery while i had it with the first screen. But the first screen had a bad digitizer also.

I can also confirm that it works with higher android versions. Though the seller confirmed it should be also working with android 4.4....
Thanks a lot dude!
Still a big progress!

Hi, can you tell me if knock knock function works to wake up the phone? or is there any trick how to get it to work. Thank you

Shynepo said:
Hi, can you tell me if knock knock function works to wake up the phone? or is there any trick how to get it to work. Thank you
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Click to collapse
Works for me. I'm aware of the issue and we know, that it's ROM/Software and not hardware dependant.