Database Users

[Q&A] Tegra Note Discoveries

Q&A for Tegra Note Discoveries
Some developers prefer that questions remain separate from their main development thread to help keep things organized. Placing your question within this thread will increase its chances of being answered by a member of the community or by the developer.
Before posting, please use the forum search and read through the discussion thread for Tegra Note Discoveries. If you can't find an answer, post it here, being sure to give as much information as possible (firmware version, steps to reproduce, logcat if available) so that you can get help.
Thanks for understanding and for helping to keep XDA neat and tidy!

I think I read through this entire thread a couple of days ago, but dont think I saw this little 'Gem' posted here.
I saw somewhere (maybe this thread) the multi-click enabling of some kind of Diagnostics function when
you multiple click on 'Settings/About Tablet/Kernel version', and you get the diagnostics dialog (much
like enabling Developer by clicking on Build number).
The new (at least for me) is multi-click on 'Settings/Android Version', and you get a little easter egg, first time I
did this I got some kind of game (I think, I dont play games), 2nd time, I could not remember what additional
things I did to get into it (there is something after the red screen).
OK, got back into the game screen again but still not sure how, you've gotta click about the screen at random.

Mobile Network setting missing?
My friend just received a Tegra Note P1640 Advent Vega running Android 4.4.2. It's stock, not rooted at all. She wants to hook up her Sierra 313U USB modem so she can get on the net with it, but for some reason Mobile Settings is missing from the SETTINGS app.
I know that this Tablet does not have a SIM card slot, so maybe that's why it's missing. But hopefully there is some way to activate it again without having to root it.
Here is what is listed under Wireless and Networking:
Wifi
Miracast
Bluetooth
Data Usage
MORE
And this is what is under MORE:
Aeroplane Mode
VPN
I found this app in the Google Play store, but that is only a shortcut. So if that Mobile Network setting is not activated, I doubt it will work, or will it?
https://play.google.com/store/apps/details?id=diewland.settings.mobilenetworks&hl=en
What do you suggest? Is there any way we can access the Mobile Network settings so she can use her Sierra USB modem without having to root it?

Tegra Note 7 Hardware Teardown Tutorial
I have been looking on the internet for quite some time now but I have not found a sequence of images or video tutorial on how to disassemble a Tegra Note 7. I only found one post on the XDA forums by member "e8hfff" that said "Tegra Note Openned" but with no images visible. Could someone provide some insight on how to properly disassemble the table?
The reason I am asking is that my TN7 is past warranty and the battery has sadly seen its last days. I have enough knowledge about Lithium Ion (smart and dumb) batteries and the confidence to fix my issue, but I am uncertain how to properly take apart the tablet, not wanting to risk damaging the components. Any advice from someone who has done this would be greatly appreciated. Thanks!

Tablet disassembly tutorial
bschles said:
I have been looking on the internet for quite some time now but I have not found a sequence of images or video tutorial on how to disassemble a Tegra Note 7. I only found one post on the XDA forums by member "e8hfff" that said "Tegra Note Openned" but with no images visible. Could someone provide some insight on how to properly disassemble the table?
The reason I am asking is that my TN7 is past warranty and the battery has sadly seen its last days. I have enough knowledge about Lithium Ion (smart and dumb) batteries and the confidence to fix my issue, but I am uncertain how to properly take apart the tablet, not wanting to risk damaging the components. Any advice from someone who has done this would be greatly appreciated. Thanks!
Click to expand...
Click to collapse
Just as bschles above, I too would like to request info on Advent Vega Tegra Note 7 disassembly.
I've managed to insert my SD Card incorrectly and cannot remove it, it is stuck inside the machine with nothing protruding to get a hold of so I cannot remove it. I would like to remove the casing so as to access the card and extract it, in some other thread someone said they can open casing with just their hands, question is 'HOW' ?
I have tried pulling and pushing and squeezing and twisting, all to no avail. With my eyes, I cannot even see where the joins are and so not sure where I should concentrate the effort to separate the case parts.
I have tried searching internet/youtube for any TN7 teardown without any success (although another thread in this forum has several pics of inside of machine) and would be grateful if someone could point at a video link or explicit instructions for
dismantling the case, then I would be able to extract the stuck card and access the data on it. as it is, I can neither remove nor insert for SD card access leaving me a little lost for what else to do.
Perhaps some kind of video submission would not be out of place in a forum dedicated to such a wonderful little tablet.
I'm kinda feeling that my only recourse to access data on SD card is a two pound hammer.
Any assistance would be gratefully accepted.
Thank you in advance.
EDIT: Link to above mentioned on-site pics of TN7 internals:- http://forum.xda-developers.com/showpost.php?p=55877787&postcount=7

Further to above:
I finally managed to get the case open.
The join lies about 1mm behind face of tablet, need to squeeze in your thumbnail and zip it around the whole of the machine
where you may hear clicks as the catches are undone.
The end furthest from ON-OFF button will be most difficult and last to release. Take care not to lose the on-off button and
audio up/down rocker as you struggle to free the case back. It took me about 25 minutes (at least) to free the case back
the first time that I finally figured out where to separate it, opened it a further few times in a lot less time.
Unfortunately, once the SD card was removed and re-inserted, it continued to fail to be detected and trying anther card
also failed, so looks like I need a new tablet although I can still continue to use this one without external card.
Anyway hope above may assist someone else if they suffer similar difficulties.

NvCPLSvc problems
I noticed that after upgrading to 5.1, the process "com.nvidia.NvCPLSvc" is constantly on top of CPU usage list, and if I turn on the "Show all ANRs" in developer settings, it shows message that this process (Nvidia Tegra Services) is not responding, killing it helps for a while, but than again, it shows up and system says it's not responding.
After killing this process system works faster, no heating (before this, my tablet reached 42 degrees even if I just listened to music in headphones with screen off...), and games doesn't lag as mush. Also no other crashes experienced by me so far.

N7 screen issue + not recognized by PC

So I have an issue with a 2012 N7, warranty is long gone. I've tried all suggestions from billykxda's thread, but no luck thus far. I've also tried Google's official page on the topic as well.
I've left the device charging for many consecutive hours, both via AC power and USB, and I suspect my issue resides with the LCD screen. Also tried a hard battery pull. It's also important to note that I haven't undertaken any mods on the device at all, i.e. the bootloader is still locked and USB debugging is not enabled yet.
When I plug the device into my PC the Win7 driver notification bubble pops up, usually reporting either an Unknown Device or an "APX drivers not installed" message. I'm unable to get it to boot into Fastboot, Recovery, or Android OS. Plugging/unplugging the device via USB yields these driver messages over and over again, along with the Win7 sound notification, so the device isn't totally dead, but no amount of button combinations or 30-60+ second button holds are getting any response.
Has anyone else experienced these issues before? Do you think my device is totally dead?

AvidPhisherman said:
Has anyone else experienced these issues before?
Click to expand...
Click to collapse
Yes; I am also experiencing similar issues. Unfortunately, I have not reached a solution. I just replaced a broken screen for a friend. Once I got the screen in, I tried turning it on but didn't see anything happen. I began to research and thought I had the dead battery issue that most people get when leaving it unplugged for an extended period of time. I plugged it in using the wall adapter for a few hours, used the power+volume buttons and still didn't get any response. Finally, I decided to charge it with my PC. The PC recognized something was plugged in, installed drivers, and now I have a Nexus 7 in my connected devices list. While connected to my PC, I hold power+volume down and hear the USB disconnect, reconnect, and have an unrecognizable device attached. This leads me to believe that the Nexus 7 is working properly and the screen is not working. I have taken the entire device apart to re-seat all connections 3 different times and still cannot get it to work. I hope someone can shed some light on our issues!
Edit: I forgot to mention, I also tested the battery with a digital multimeter. It reads approximately 3.79 volts DC. I thought it may be important to state this in case the issue is battery related. I'm not certain what the correct value should be for it to work properly.

I am currently trying to diagnose this problem. Yesterday, I hopped on Craigslist and bought a working Nexus 7 for 50$. I am currently taking it apart to rob parts from it and figure out where the problem is. So far I have tested the battery. The battery reads approximately 3.78 volts DC so I can probably rule this out as my problem.
Also, I noticed something strange yesterday. I took the broken Nexus with me when I went to meet up with the man selling the used/working Nexus. While I was outside in very bright sunlight, I pushed the power button on the broken Nexus. I noticed that I could actually see the screen doing something. It was all fuzzy and had lines running every where, but you could in fact see it doing something. I think the replacement screen I received is bad, but I won't know until I start swapping parts.
AvidPhisherman, for now maybe try taking your Nexus out in very bright sunlight and see if you can see the screen do anything when you press the power button. Also, I'm not trying to hijack the thread. It seems that we have very similar issues. I hope to find something that fixes both of our problems.

Success.... kinda. I tried combining the broken Nexus 7 motherboard with the working Nexus 7 screen but it wouldn't fit since one is the 3G model, and the other is the Wifi only model. Next, I put everything back together on the broken N7, but this time I used the LCD ribbon cable from the good N7. Success!!! It powered up, and I can see the screen. My problem now, is that the screen is mostly unresponsive and acts like you are touching it in random spots, when you're not touching it at all. I'm taking it apart to re-seat the connections... again.

__redfox__ said:
Success.... kinda. I tried combining the broken Nexus 7 motherboard with the working Nexus 7 screen but it wouldn't fit since one is the 3G model, and the other is the Wifi only model. Next, I put everything back together on the broken N7, but this time I used the LCD ribbon cable from the good N7. Success!!! It powered up, and I can see the screen. My problem now, is that the screen is mostly unresponsive and acts like you are touching it in random spots, when you're not touching it at all. I'm taking it apart to re-seat the connections... again.
Click to expand...
Click to collapse
Hey redfox thanks for taking in interest in this! You're not hijacking the thread, your posts are very helpful. Good to know I'm not the only one experiencing these issues.
I'm just a hobbyist with an interest in fixing things, although I don't have much experience with DIY fixing. I didn't have a chance to try turning the screen on under direct sunlight, but yesterday I took both my non-working Nexus 7s (the first one I mentioned in my OP, the second one just has a bad/hollowed out USB port) in to a repair shop for a free diagnosis. I'm actually a business user, my company owns the tablets but I'm responsible for maintenance/tech troubleshooting.
Please keep me posted with updates as to how your progress is going. I'll post again once I get a report from the repair shop re: my issues.

Hi,
I have been having the same problem,
I bought my wife a used Nexus 7 and it worked just fine for almost a year then all of the sudden the screen would not function
there would be lines going through it but it remain dark.
thank you for researching the matter i will try to buy the part online and see if i can get it to work now!
if i understand it correctly there is no need for a new mother board but just a new LCD ribbon cable?

godnessy said:
Hi,
I have been having the same problem,
I bought my wife a used Nexus 7 and it worked just fine for almost a year then all of the sudden the screen would not function
there would be lines going through it but it remain dark.
thank you for researching the matter i will try to buy the part online and see if i can get it to work now!
if i understand it correctly there is no need for a new mother board but just a new LCD ribbon cable?
Click to expand...
Click to collapse
I cannot guarantee that it will fix your screen, but it is possible. When I had this one out in the sun, it did the same thing. The screen was super dark, and I could see crazy lines. Hopefully a new ribbon/cable will fix your problem. They are only a few dollars on Amazon.com

godnessy said:
Hi,
I have been having the same problem,
I bought my wife a used Nexus 7 and it worked just fine for almost a year then all of the sudden the screen would not function
there would be lines going through it but it remain dark.
thank you for researching the matter i will try to buy the part online and see if i can get it to work now!
if i understand it correctly there is no need for a new mother board but just a new LCD ribbon cable?
Click to expand...
Click to collapse
__redfox__ said:
I cannot guarantee that it will fix your screen, but it is possible. When I had this one out in the sun, it did the same thing. The screen was super dark, and I could see crazy lines. Hopefully a new ribbon/cable will fix your problem. They are only a few dollars on Amazon.com
Click to expand...
Click to collapse
Hello fellow users! Quick update, I finally heard back from the repair shop.
Bad news - they tried swapping out the screen, then the battery, USB charging port, display cables, etc. etc. and nothing worked. Their diagnosis is that the tablet has a fried motherboard, and they're unable to repair and/or replace it
Good news - it cost me nothing to receive this diagnosis
Hopefully the outlook is not so grim for your respective N7s. Just wanted to post an update as to what I learned from this whole experience.

Hi guys, Reporting in.
Toke a while but i got the part AND found the stupid device!
After ALOT of fiddling, taking apart and putting back again i found out that the problem was the battery!
it looks like it was on its last leg and that caused all the strange screen stuff.
I dont have another battery to replace it so instead i hooked it up straight to a USB cable and into the socket and it works just fine
thanks for the tips and hopefully this helps someone else!

[Q] Lenovo A7 (A3500) / A8 (A5500) digitizer issue?

Sorry to hijack an A3000 sub-forum with what appears to be an issue on A3500/A5500 Lenovo tablets, but seeing that there is no other place to post this I decided to go ahead and do so here. If the admins chose so, please move to a more relevant sub-thread. Please bear with me as I describe the issue below...
So I bought this A5500 the other day and was immediately confronted with what -as found at a later stage- appears to be a widespread issue on Lenovo's A3500/A5500 tablets. The issue is quite easy to replicate and is clearly evident when scrolling through a page with the finger in direct and constant touch to the screen. In this case the flow is jumpy and non-continuous as shown in the video below.
Link inserted here, however since I'm a new member I'm not allowed to attach as an external link, hopefully pasting as text link is allowed, however functionality is obviously hindered somewhat...Sorry about that, nothing I can do on my front. Please remove respective spaces from the link below to view the video, thanks.
htt p s://vid.me/gfEj
What strikes me most is that I couldn't find any mention of the issue anywhere on the internet, seeing that it has obvious knock-on effects even on sketching a simple vertical line as shown above. So this happens only on the vertical axis, on almost all of the Lenovo A3500/A5500 devices I could get my hands on, even on the display / demo units found on major retail stores in the vicinity of where I live (South Europe). And I say almost, since apparently A7500s (A10s - 10'') models DON'T exhibit said behavior, which is ALSO the case with most other branded tablets I managed to test, either LG, Asus etc...
So my question would be if this is a known-issue for these devices, or something's gone horribly wrong with the digitizer panel of specific batches of these and need to be replaced by the manufacturer...In either case if you happen to be the owner of one such tablet, please take some time to perform these tests and report back.
Thanks!

So drawing on the vertical axis appears like so...Is this normal?!

My galaxy s8 have green screen problem, can i fix it ?

Please help .
On my phone Galaxy S8 after the fall on the display appeared green Artifacts -[lines]
Can I fix it whiteout replacing screen ?

dusiko said:
Please help .
On my phone Galaxy S8 after the fall on the display appeared green Artifacts -[lines]
Can I fix it whiteout replacing screen ?
Click to expand...
Click to collapse
Probably not. Might check the flex on the screen. But thats about as far as you can go

Ok thanks

i agree with @TheMadScientist. if you look at the thread right next to the OPs (well, it was at the time i wrote this at least) a similarly described problem is extant there. Its likely the ribbon cable and not much you can do about it

Galaxy Tab E 9.6 Screen flickering / funny colors problem

Some days ago my tablet started malfunctioning. My family member was uses it regularly. One day when the battery was at 25%, they disconnected the earphone from the tablet, and the tablet died immediately. After few days of charging it. I found out that the screen is malfunctioning.
It mostly happens when I apply pressure on the top area of the tablet, the screen glitches out, looks like a ribbon is loose, but I opened the tablet and reconnected the top ribbon cables. But still the problem occurs.
It works for maybe 1 or 2 minutes and then glitches out.
Anyone please help me to solve this problem.
Please watch this video
I have taken video of the tablet :- https://youtu.be/BUPNA1s5tsA

Galaxy tab e funny colors and gliches on screen.
I have two galaxy tab e's (smt560) one black and white and the white one has the same issue. My mum used to use it regulary until one day when she was using it it crashed and now it has the same issue. I don't know if the white ones are faulty because the black one was abused and it works just fine. I flashed the stock rom once again but it didn't fix it i think the screen is faulty but i'm not sure