[Unsolved] Screen issues

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aljowen

Senior Member
Jun 1, 2013
52
5
Video of the issue: https://www.youtube.com/watch?v=XzIx9SHj6MQ&feature=youtu.be

According to my sister it has always had the screen "artifacts"as shown in the video where certain pixels are the wrong colours (which apparently never set off any alarm bells in her head... :p ). But apparently the screen and device stopped responding correctly a while back which i have been able to find out can be fixed by taking the back off the device. I can not use the recovery on the device since it just displays multicolored static on the screen, same thing happens when the device is plugged in to charge while powered off. I told her to get all important data off the device and factory reset it so the device is all at factory defaults to rule out software issues. After that didn't work i took the back off the device to check to see if the screen was connected correctly and to see if there were any obvious issues such as the cable being visibly damaged or disconnected etc.

Image of the issue when charging: http://i.imgur.com/Kat1RoC.jpg

So everything is stock on the device. It has never ran anything but official updates directly from Google.

The device is out of warranty and considering the cracks on the corners of the case i doubt Google/Asus would be happy to fix the device out of warranty without it getting expensive. It would be nice to fix it if it is possible or financially viable.

Any ideas and suggestions appreciated!
 

aljowen

Senior Member
Jun 1, 2013
52
5
Have you tried a factory reset? If not, have you tried reflashing a stock rom, wiping everything?

It has been factory reset. I have not flashed a new ROM to it.

I have actually fixed that issue by putting some padding in to prevent the cable from flexing so much inside the case. So the device now functions as an e-reader and web browser. But it still cannot play video or cope with scrolling through images and so on due to the tearing. It gets worse the more that is updated on the screen. This may still be a cable issue.

I would flash a new kernel and ROM to the device but download mode doesn't work since no computer can recognize the device. In download mode and recovery the screen shows the static as shown in the image meaning i cant really use it easily. Since it is still running stock recovery i cant just flash a zip file, since download mode doesn't work it may be difficult to do the above.
But i only have experience with my own Galaxy S2 which runs custom everything. So my experience is with Odin and CWM, so i am not familiar with download mode for other manufacturers.
 

dikidera

Senior Member
May 18, 2010
128
10
The second image, I know this. I was fiddling with the ribbon cables one day and I also got that distorted screen.
If it appears when charging, sounds like...the cable is not grounded or something and the signal(to/from the ribbon cable) is being distorted. But that is just a guess, it could be anything.
 

aljowen

Senior Member
Jun 1, 2013
52
5
The second image, I know this. I was fiddling with the ribbon cables one day and I also got that distorted screen.
If it appears when charging, sounds like...the cable is not grounded or something and the signal(to/from the ribbon cable) is being distorted. But that is just a guess, it could be anything.

Its not exclusive to charging though therefore i dont think it is power related. It happens every single time the system displays something on screen outside of Android. So the charging screen, recovery and download mode are all displayed as that.
 

dikidera

Senior Member
May 18, 2010
128
10
Have you tried fiddling with said cable when you get the distorted image, in an attempt to perhaps fix it? it's odd that it appears with system messages. This sounds more and more like a true hardware issue(a defective unit) than software or a "simple" ribbon cable problem.
 

aljowen

Senior Member
Jun 1, 2013
52
5
Have you tried fiddling with said cable when you get the distorted image, in an attempt to perhaps fix it? it's odd that it appears with system messages. This sounds more and more like a true hardware issue(a defective unit) than software or a "simple" ribbon cable problem.

Not while it displays that image. But i have unplugged it and plugged it back in and nothing has helped.
My theory at the moment is that the cable is damaged meaning when the device tries to completely update the screen data goes missing and it struggles. Since videos dont work at all while the android flappy bird clone works flawlessly since it doesn't need to send as much data to update the screen due to the solid background colours and so on. But there are still holes in that theory, for example the issues become many many times worse when the device is in landscape mode.
So as far as i can tell it could be anything from heavily corrupted software to broken vram and anything in between including broken cable (since fiddling with that has fixed a different issue, perhaps its related) to the displays RAM for storing the previous screen update being broken. I can't tell.
 

dikidera

Senior Member
May 18, 2010
128
10
Defective VRAM is also a possibility.

But I am not aware of any tool(for Android) that would allow for direct memory scanning of the VRAM. If you end up deciding the tablet is a goner, and want to buy a new one. I'd advise against another N7, it's already old, and the bugs are not worth the hassle.
 

aljowen

Senior Member
Jun 1, 2013
52
5
Defective VRAM is also a possibility.

But I am not aware of any tool(for Android) that would allow for direct memory scanning of the VRAM. If you end up deciding the tablet is a goner, and want to buy a new one. I'd advise against another N7, it's already old, and the bugs are not worth the hassle.

Yeah, im not aware of any either. I have also been through all the relevant debugging tools. Telling the screen to flash on update actually made the device function much better (where it flashes pink on each update) it stopped the issues from being serious. But lets face it, no one is going to want to use a device with that debugging option left enabled.
 
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