yashsingh1/xdaforums huggingface dataset:
[Nexus 7 Q&A, Help & Troubleshooting] arhaam:
Asus Nexus 7 ME370T stuck on formating logo

after update to lollipop its stuck on auto formatting ... even can't go to in recovery mode... try a lots but no result ... plz help me developers
[Nexus 7 Q&A, Help & Troubleshooting] argon9898:
I got my N7 from mid 2013. It worked like a charm until I got into a rage with my gf, smashed it hard in front of her and got the screen repaired afterwards. Later then, I noticed a few minor problems that seem to have persisted from the day I took it out of the box:

1. The battery sometimes drains automatically, especially when powered off.

2. The newly repaired screen appears to leave 'ghost traces' of the previous screen when jumping to another app.

3. There were several fingerprints on the copper patch at the bottom right of the device. Someone must have done something to it, I thought.

Can anyone explain all to me? Do you guys think that I have bought a not-so-new version of it?
[Nexus 7 Q&A, Help & Troubleshooting] itm:
Here's my variation on the problem...my unit has been fine, and sits permanently on my bedside table. It gets charged every night, but the battery level never drops below 90%. This morning I was using it, with the battery at 92%. A few minutes later I noticed that it was showing the "Google" boot screen with the lock symbol (as if it had rebooted), but it was stuck on that screen. I pressed and held the power button and it turned off, but now I can't power it on.

I tried:

1. Pressing and holding the power button for up to a minute (with the charger connected)

2. Pressing and holding power & vol-

3. Removing and replacing the battery connector (it was not loose, and in fact required some effort to remove it).

I was running Dirty Unicorn (Android 6), and had not had any problems with the battery up to now. Also rooted.

Any ideas??

---------- Post added 8th January 2017 at 12:08 AM ---------- Previous post was 7th January 2017 at 11:42 PM ----------

Update: I've just used a multitester to check whether there's any voltage from the battery (connected the red and black probes to the motherboard pins adjacent to the red & black cables on the power connector. I got a 5V reading so I guess the battery is still alive???
[Nexus 7 Q&A, Help & Troubleshooting] rtusedit:
I have two N7 grouper units, Unit A charges fine regardless of charger used. Unit B charging was flakey, but typically would not hold a charge or recharge even using the same charger that works fine for Unit A.

I pulled the battery in Unit B, "hot wired" it to a charger and it reached 100% (~4v). I swapped batteries in each unit, problem stayed with the device (it did not follow the battery.) I connected Unit B to an anker multiport charger, and unit charged to 88%... interesting, I thought. Here's what I did next, which I'm cautiously optimistic may have resolved my battery charging issues:

Open case

Remove battery

Disconnect USB/Audio module

Note the IO ribbon cable connected to USB/Audio module. Under the battery is a copper sheild, underwhich the IO cable is routed. IO Cable is folded 90 degrees and connects to main board (under some tape).

Carefully pull tape & disconnect the IO cable from main board.

Clean contacts on ribbon cable with fiberglass brush

Reconnect ribbon cable to main board and USB/Audio module. Reapply tape

Reassembed

Using stock charger, Unit B is now charged up to 100% and staying there!

Probably not necessary, but I added tape to the ribbon cable where it passes under copper shield. My concern was the copper might rub against the cable causing a short though I didn't see any evidence of it. Also, I was concerned that the 45 degree bend in the ribbon that creates the 90 degree fold might result in a conductor in the ribbon breaking. I tested with a ohm meter, but saw no evidence of that either.
[Nexus 7 Q&A, Help & Troubleshooting] summerisle2001:
Only boots when plugged in to charger?

If this isn't the right place to post this please feel free to move.

My Nexus 7 2012 will not turn on unless it is connected to the wall charger via USB cable. No amount of button pressing will boot it up off the battery. I have tried several batteries with the same result.

The battery charges/discharges normally and the tablet functions normally off the battery as long as it isn't powered off. As soon as the Google logo appears the power can be turned off and it continues to boot up from the battery.

I have tried factory reset and flashing a few different custom roms but the problem remains.

I am presuming that something must be amiss on the board and that the initial spark from the battery to boot it isn't sufficient?

Any help would be greatly appreciated.
[Nexus 7 Q&A, Help & Troubleshooting] n3wDaddy77:
Re: N7 Turns Off/Won't Turn Back On - A Summary...

Thanks for this thread! I've been experiencing this behavior for a couple of weeks now and didn't realize that this was a unique OS / battery problem until yesterday.

I'll try the fixes that's listed in OP. Hopefully it will work.
[Nexus 7 Q&A, Help & Troubleshooting] ynrozturk:
My device is working perfectly again. Went back to stock, wiped, unlocked, rooted, unplugged battery, Paranoid Android 2.99 and now the battery goes down to 2% :cool:
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Another success.

Glad to hear it.

Enjoy your N7!

-bk
[Nexus 7 Q&A, Help & Troubleshooting] sqbi87:
Is there no other way to fix this? I really don't want to wipe my device to factory settings and lose all my stuff, my Nexus is not rooted and started turning off at 20-something % Its been more than 12h since my last charging and it still displays 100% of battery @_@
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Here are your choices as I see it:

- Follow my suggestions in the OP. They take a little effort and will likely solve your issues.

- Try the suggestions listed in other threads that may be easier/less intrusive/quicker. Other suggestions detailed in various threads (there are lots of 'em) seem to be based on anecdotal evidence and are less likely to work. My guess is that there is some other variable being resolved when these outlier suggestions actually "work".

- Decide that you don't want to do the suggestions in the OP and just live with the issues. I've read that some people just look past these issues and patiently wait for the next OS release, hoping that a resolution is incorporated. I wish I had such patience and faith. :)

- Return your N7 for replacement. If you return your N7, don't be totally surprised if your new N7 exhibits these issues down the road at some point.

I hope this helps!
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Update bump!

See the OP for new info.
[Nexus 7 Q&A, Help & Troubleshooting] n3wDaddy77:
Re: N7 Turns Off/Won't Turn Back On - A Summary **UPDATE**...

Thanks for the update! :thumbup:
[Nexus 7 Q&A, Help & Troubleshooting] Tomaxda:
Couple quick observations on my version of the problem:

I believe I have issue#2 - my N7 suddenly turns off at 20-30% battery.

When I plug in the power and restart my Nexus 7 it shows that the battery suddenly dropped to ~0%, but then equally suddenly (when I plug it in) it jumps back up to the 20-30% range.

After 6 months of fairly heavy usage, this suddenly started this week just after upgrading from 4.2.1 --> 4.2.2. So either it is 'caused' by 4.2.2, or it is caused by some sort of physical malfunction/battery wear that just happened to manifest now.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Have you tried putting a little juice in it by charging it for 20-30 minutes (since it might actually be at 0% now), then turning it (all the way) off for a few hours? This worked perfectly for me, per my update post. Give it a try if you haven't already.
[Nexus 7 Q&A, Help & Troubleshooting] sqbi87:
Odp: N7 Turns Off/Won't Turn Back On - A Summary **UPDATE**...

I don't know this might have somethig to do with this but my battery problem stopped when I changed the outlet I've been using to charge my nexus. First I left it for a whole day when the battery was pretty low and let it to power off, than I plugged it in to the same outlet I'm using to charge my phone (before I was using a different one). It took a few hours to fully charge my tablet and since then that issue didn't appear. I am still using just that particular outlet and everythig is just fine.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
If I understand your scenario right, having your N7 completely powered-down for a period of time is probably what "fixed" your problem. It may not have anything to do with a specific outlet in your house.
[Nexus 7 Q&A, Help & Troubleshooting] sqbi87:
Odp: N7 Turns Off/Won't Turn Back On - A Summary **UPDATE**...

It might be just that you are right but I'm still using that other outlet :)

Wysyłane z mojego Nexus 7 za pomocą Tapatalk 2
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
:)

Backatcha
[Nexus 7 Q&A, Help & Troubleshooting] ianmedina:
i just open up my back cover then i unplugged the battery cord and put it back. my battery is already calibrated down to only 5% instead of 34% before it turns off automatically. Now i'll just have to wait for this one to fully charge and see if there's still an automatic shutdown for me at 34% and to see if there's no more screen flickering problem.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Good luck! Chances are, you'll be OK.

If not, be sure to read my entire post - it's got all of the fixes that have been shown over time to work.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Time to bump this back up into view.

It would be great if more people read my thread when they encounter battery-related issues. It would save a lot of time and frustration for N7 owners.
[Nexus 7 Q&A, Help & Troubleshooting] dexterslab:
I have seen this issue on my n7 a few times, each time i just charge it fully and its fine running down to the last few % where it shuts down rather than just shutting off.

It almost seems like it uses this to periodically recalibrate to make sure your getting the maximum from the battery?

I doubt its anything to do with the charger
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Agreed - the charger has not been the issue.

Recalibration seems to be at the center of this issue. But, there are different scenarios that seem to accomplish the "recalibration". These scenarios range from fully charging, to disconnecting power to the circuit by pulling the battery cable, to simply turning off the N7 for a period of time.

In the months that I've researched this issue and helped lots of N7 owners through resolving it, I'd say that simply turning off the N7 for an hour or two is the most frequent fix.

I had this issue twice back in January and thought that I'd have to live with that behavior. I now routinely shut down the N7 during a long charge, maybe once every two weeks, and it has not reappeared once.
[Nexus 7 Q&A, Help & Troubleshooting] 266K:
I am also having this battery issues like hard to turn on or battery completely drained during sleep mode. I first noticed this problem after updated to stock 4.2.2, same problem again on Sentinel 4.2.2. ROM

I just flashed Smooth ROM 5.1 two days ago and it seem to be ok for now. at the same time I begin to suspect it is could probably caused by my magnetic cover. Just wonder any one who doesn't use the magnetic cover but also having battery issue in this thread.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Not sure if the magentic cover is actually at the root of these problems, but who knows?

Will be interesting to see if others weigh in on that.
[Nexus 7 Q&A, Help & Troubleshooting] Macmee:
I'm sort of suspicious about the Nexus 7.

I sent mine to the ASUS repair center to get my LCD fixed (my N7 came with a circular light leak that seemed to grow over time). I only told them about my faulty screen, but on the repair notes it says they also replaced my battery.

Battery? Perhaps it's standard procedure to test the charge of batteries and replace them if they've lost a significant amount of their capacity, but I also had the issue of my device not turning on when I press the power button. I have a suspicion that perhaps the batch of N7s that mine comes from had this common issue with either the batteries or the connectors, and perhaps this is why the replaced mine.

Just some food for thought.
[Nexus 7 Q&A, Help & Troubleshooting] n3wDaddy77:
I've been following this thread for a few months now and have successfully used the recommendations listed by the OP (specifically, the turn-off recalibration method).

(Thanks to the OP for diligently researching this issue BTW. :thumbup: )

However, this past Saturday something happened that I wasn't expecting. The tablet shut down at 37% while I was watching a movie. Unsettling screen flicker accompanied the shutdown. When I got home, I attempted to charge the N7 as I had done in the past, but it wasn't accepting a charge at all! I only got it to turn on momentarily a handful of times, only when the unit was connected to my PC. Each time, I only got to the boot logo before the screen flickered out again. Fastboot to Recovery mode also didn't work.

I feared that my N7 finally kicked the bucket, so I frantically called Google and obtained an RMA for an exchange.

It was only a few hours after I had called Google for the exchange that I decided to try one more time to resurrect my N7. It finally decided to accept a charge and the unit started functioning as usual.

While I'm glad that my N7 is working again and I'm sure that the behavior I experienced is due to the same root issue contained within this thread, I believe that I'm still going to proceed with the exchange. Hopefully the new unit I receive will not have this issue at all.

Just thought I would share my experience with the subscribers of this thread and I'll post my experience with the new unit once it arrives (after I've had a while to use it of course).
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Sorry to hear this, but thanks for sharing.

BTW - was your N7 completely shut down prior to it accepting a charge?
[Nexus 7 Q&A, Help & Troubleshooting] n3wDaddy77:
I believed that it was. I became extremely worried when I had plugged then unit in for approx 1.5 hours using the AC adaptor before my first attempts at booting it and it registered no change in the battery before abruptly shutting down.

Is there a way to determine whether the unit is completely shut down when it's behaving this way?

Thx!
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
"Power Off" is usually good enough. But as I indicate in the OP, sometimes a battery pull is the only way to completely power-down the N7.
[Nexus 7 Q&A, Help & Troubleshooting] Macmee:
Just got my N7 back from ASUS repair (complained about light leak in LCD, got new LCD, new LCD has even worse leak).

Only complained about damaged LCD, they gave me a new battery, reported as "battery error". Interesting.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Wonder what THAT means?

Probably never know.

Thanks for sharing.
[Nexus 7 Q&A, Help & Troubleshooting] hheegg:
cover with magnetic top

Two days ago I purchased a new cover for my N7. I put it in and after that, my N7 randomly switched of by itself, and I was unable to switch it on again

After power down it worked again for some minutes and than again the problem

Actually it was that foldable cover, I bought. I think that magnetic top cover caused the problem, interfering with any part in N7. I returned that cover and changed to an other model, and the problems are gone

Give this a try, if you have that trouble, may be, it helps
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
This was also reported in this thread on May 20th, so maybe there is something to this.

Let's see if others continue to chime in.

-bk
[Nexus 7 Q&A, Help & Troubleshooting] jimbobcooterrooter:
i started a new thread with the following question......I figured id also place it here, as many may over look my title and assume im a dumbass and didnt read this sticky....i did read this sticky and tried it all....anyways here it is:

we got my son a nexus 7 a while back and it is perfect....none of the issues some users have it has just been great......then my son screwed up the charging port by forcing his charger into in...yes he was given a stern talking to and a tutorial on how to properly charge electronics...no worries though I'll order him the dock.

Got the dock and now the Nexus 7 just screen flickers......

so to recap:

1)cant charge via port

2)dock causes Nexus to just screen flicker

what I've tried:

1)it sat on the dock for 24 hours - no dice

2) held power button down for 60 secs - no dice

3) tried every combination of Vol +/- & Power possible (for up to 60 secs) - there is a pattern developing

4)removed back and did a batt unplug/replug and then repeated the above 3 things - still no dice

(oh and yes I tried 1-3 both while it was docked and undocked)

I'm sure that it doesn't help that I cant be wired.....so I ask you the wonderful community.....any thoughts?

also it is a stock never rooted nexus 7.

Thank you in advance!!
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Sorry to hear about your dilemma. Not sure if it's really on-topic for this thread, since you have the possible variable of a broken charger port, and we haven't dealt with docking issues in this particular thread. I am sure someone will chime in on your other thread with some ideas. Good luck with it!
[Nexus 7 Q&A, Help & Troubleshooting] jimbobcooterrooter:
Got it to start working......I unplugged the batt overnight and replugged it in.....and boom, like a boss.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Interestingly, unplugging the battery and/or turning it off for an extended period of time are "fixes" listed in the thread - not sure if you randomly tried that or read it in the thread.

Either way, it's all good.

Congrats!

Enjoy your N7.
[Nexus 7 Q&A, Help & Troubleshooting] tropango:
And

Every time I encounter this problem, my N7 reverts back to Jan 1, 2000, 9 AM. It's kinda annoying.

"I plugged my N7 in for about 20 minutes to give it the juice it would need to restart after the period of time being turned off. Then, I unplugged it and turned it off. Waited an hour, and when I restarted it, the battery had been recalibrated to 0%. Awesome!"

This worked for me a few weeks back. Today, I had fully charged my N7, and then realized that the battery was giving the wrong information again. I turned it off for an hour and when I restarted it seems to have recalibrated as well. In my case, it went to 89%. So I guess your fix works whatever your battery level :)

Sorry, I am a noob.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
It'll work with the battery at any level.

Glad it helped.
[Nexus 7 Q&A, Help & Troubleshooting] zurohki:
Thanks for the idea. I was given a family member's dead flat Nexus 7 and couldn't get it to charge until I saw this and tried plugging it into a PC to slow charge it. I was about to give up and tell her to take it back to the store tomorrow.

Maybe a dead battery and the high current of the 2A stock charger trips some protection mechanism in the charge control circuitry but the lower current of a USB port doesn't? Just guessing. It's something else to try before giving up, anyway.
[Nexus 7 Q&A, Help & Troubleshooting] iXanza:
My n7 charging has been really bad last night. I left it on at 18% . 7 hours later it's at 60% . I used it to check xda and it dropped to 59 while on the charger. Could this be caused by updating the boot loader as I recently updated from 3.41 to 4.18
[Nexus 7 Q&A, Help & Troubleshooting] zurohki:
Sounds like it's not drawing enough power to fast charge. You need a 2 amp charger rather than a normal (1 amp) phone charger, and the charger's data pins have to be joined together to tell the Nexus 7 that it's okay to draw more power than a PC's USB port can provide.

Under Battery in the settings menu, if it says Charging (USB), the charger isn't wired right and the Nexus 7 is playing it safe so that it doesn't damage a PC's USB ports. If it says Charging (AC), maybe the charger or cable isn't providing enough power?

I don't *think* the bootloader could make a difference, but if you've been fast charging with that charger and cable up until now I suppose it's possible.
[Nexus 7 Q&A, Help & Troubleshooting] surferdude73:
Ok crap. I've never had a problem with my bone stock N7. I misplaced it for about a month, and the battery discharged.

I plugged it in to the official charger, and the screen backlit and had a couple of flickering lines. I left it to charge for a couple of hours.

Now, nothing is happening, won't boot. Doesn't show any charge animation. Doesn't activate backlight when I plug it in to wall charger, or USB in desktop.

I've tried Power + Vol down.

Power + Vol up.

Power + Vol up + Vol down.

Power button held 1-2 minutes.

All of the above using 60 sec + stopwatches.

All Power + Vol combos again.

Repeated Power + Vol buttons.

Pushed a paperclip into the mechanical pinhole (not sure what this does though) and held it for 60+ seconds.

I'm at a loss now, don't know what else to try. Does anyone have any suggestions? I removed the magnetic case before starting troubleshooting.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
surferdude73:

Not sure I saw doing a Factory Reset in your list (using the option under "Settings/Backup and Reset").

Otherwise, it could be an issue with the sequence of fixes.

For instance, making sure your N7 is completely off for a period of time prior to adding power might be a matter of pulling off the back, pulling the battery, reconnecting, and then waiting 1 or more hours knowing that the N7 is absolutely "off" prior to connecting your charger could do the trick. I can't tell from your post if you did exactly this process, in this order.

Report back!

-bk
[Nexus 7 Q&A, Help & Troubleshooting] duryard:
My nexus 7 Has just sort of died:(

Turned it on this morning and I have purtity rom on it.

It loads with a stripy dark screen moving right to left (portrait) and then stays on the stripy screen.

It "seems" as if it all loads up but I cant see the desktop properly as the screen is all dark Vertical stripes.

After 2 mins device sleeps as normal.

I can access the "SD card" via usb.

Any help please??
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
Your symptoms don't seem to be typical of those discussed in this thread, but I'd recommend trying the methods outlined in the OP anyway. If any of them work for you, that would be great. If not, you have something else going on.

Good luck!
[Nexus 7 Q&A, Help & Troubleshooting] duryard:
Thanks [MENTION=4552914]billykxda[/MENTION]. I think I will have to flash it back to stock using a tool kit or some such as I need to see whats going on on the screen really to do anything. Unless I can restore a backup from adb. Will have a fiddle around later and report back.
[Nexus 7 Q&A, Help & Troubleshooting] dalanik:
Just discovered this useful thread since I seem to be having issue #3... I don't use N7 much since I got the note II but use it like 0.5-1 hour a day. That way it could stay on standby for days, like 4-5 days which was cool. All of a sudden I noticed that, when I came from work, it was off, and I was sure that when I left it the night before it was like at 60% which should last for days in standby. This happened once more and then later it happened to me while I was doing something, it just shut down! I was scared I'd have to return it for replacing/repair AGAIN (1st time it just rebooted everx 5 minutes) and wait another 3-4 weeks.... (yes, czech law sucks, they have whole month to process warranty repairs)

But when I plugged it in and charged it it worked just fine. And the battery stats show sudden drop from like 30% to zero!

It wasn't until I read this thread that I noticed that it really stays on 100% longer than before!

SO I will try shutting it down for a few hours and se if that helps. Thanx to everyone for great thread!

D.
[Nexus 7 Q&A, Help & Troubleshooting] billykxda:
I think it will do the trick.

Good luck!