I have a serious issue with my Nexus 7 2012. I put CM11 on it and all was great. The power got down to 11% on me, so I plugged it into my computer. I noticed it wasn’t charging, MTP didn’t kick in, and I couldn't get into ADB. I figured I’d screwed up the USB port. I tried different cables all with the same results. I turned the tablet off and plugged it in and the battery started charging. I couldn’t get MTP or PTP to work nor could I get into ADB after it was charged. I did a factory reset, clearing everything, and reinstalled. Same issue.
I can use my OTG cable and TWRP to install software on the tablet. I tried AKOP ROM. It allows me to use my OTG cable but the tablet doesn’t charge. I try to toggle MTP to PTP or turn off USB debugging and the tablet locks and reboots. I try to turn off the developer options toggle and the tablet locks and restarts.
Help! I don’t know what to do with it. I've searched all day.
Check the basics. When you plug your N7 into your computer, are you using a USB 2.0 port? Is it directly mounted on the computer's motherboard (i.e., a rear port)? Are the proper drivers installed so your N7 is recognized as a Nexus 7?
USB specifications only provide .5A power, v. 2.0A power from the AC charger. Get your N7 fully charged,then get back with whether it locks and reboots.
exglynco said:
Check the basics. When you plug your N7 into your computer, are you using a USB 2.0 port? Is it directly mounted on the computer's motherboard (i.e., a rear port)? Are the proper drivers installed so your N7 is recognized as a Nexus 7?
USB specifications only provide .5A power, v. 2.0A power from the AC charger. Get your N7 fully charged,then get back with whether it locks and reboots.
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Thanks for the reply. Yes. I've done all of that. Multiple computers, multiple cables, multiple chargers. The Nexus is at 100%.
Here's the exact issue I have now: http://forum.xda-developers.com/showthread.php?t=2536272
Well. I'm going to say disregard. My searches show that a craptastic 12 volt car charger probably hosed the N7's mother board. I'm going to try one more fix but I'm sure it's toast.
Related
Hello friends,
I'm having trouble on charging my nexus 7. When it is ON and I plug the original USB charger, it's not recognized by the tablet, and it doesn't recharge. So I have to turn it off and then recharge it.
Also, as the USB is not recognized, I'm not able to transfer files to my tablet, like movies, for example.
In short, my tablet does not recognize that an USB cable is plugged when it's ON.
Any ideas about how to solve it? My version is 4.2.2.
All the best,
Diego
I'm quit sure it's a hardware issue. I that case you should contact google and make use of your warrenty. Though you may try factory reset. I don't think it's gonna work.
Seems a bit odd but my Nexus 7 (1st Gen) will not charge when connected to a USB wall outlet. But it has no issues charging when connected to a desktop/laptop.
The following I have tried:
- I have rebooted, shutdown, booted into the boot loader and shutdown/rebooted from it into the OS
- I have tried several USB wall power adapter range in amps output from 0.7 to 2.0.
----Also tried 4 different USB cables with the USB wall power adapter.
-Enabled/disabled developer mode along with USB debugging mode
-Tried charging the unit when it is OFF and ON, only charges when connected to a USB port on a desktop/laptop
-Removed the back cover to see if the USB port could be loose, looks and feels securely in place
Not sure if it could be a software issue, unit is running 4.3 build number JWR66Y. I am hoping to avoid resetting the unit but if I have to I will.
Thoughts anyone?
Is your device rooted? If yes, then try to change the ROM (make a nandroid first).
Sent from my Nexus 7 using XDA App
maybe this shud work for u , it worked for me
wipe cache partition from CWM Recovery
http://canvas2update.blogspot.nl/2014/11/not-connecting-as-usb-storage-only.html
I would say if your rooted and cutomed and all that try a different kernel before a whole new rom. Kangaroo kernel first page of dev page is good.
Mine gets stuck sometimes. I installed battery monitor widget to see the actual current flow when charging. Even though it shows ac connected the graph can remain flat with no charge. Replugging the cord a few times gets it going. A charge only USB cord might help, but I've gotten the best amperage with the included cable so far.
So, I apparently did something very stupid with my new Nexus 7.
I have a few 1 TB external hard drives, which don't get enough power via an OTG adapter from the Nexus 7 to run. So, I purchased a two into one cable -- that is, a cable that combines two male USB A plugs into one Micro USB B plug so that a USB 3.0 hard drive can use two USB 2.0 ports to have enough power. I had planned to use this to enable use of the hard drives with the Nexus 7 while traveling by plugging one cable in the tablet and the other into a charger.
When I got the cable I tested it by plugging one of the USB A plugs into my Nexus 7, and then I plugged the other into my computer's USB port. The Nexus 7 promptly shut down, the computer complained of a power surge on the USB port, and a distinct smell of melted plastic came from the computer's USB port. I guess the combining cable didn't combine so much as it just acted like a double headed male A USB cable and shorted things out?
The Nexus 7 refused to restart afterwards until I it plugged it into its charger. It works now, mostly. However, if its battery charge is above about eighty-seven percent then it always reports that it is charging, regardless if it is plugged in or not. And if I plug it into a computer while it is reporting that it is charging I have to restart the tablet to get it to connect to the computer -- I guess it thinks it is connected to a charger and doesn't bother checking for a data connection unless restarted.
The level where it stops thinking it's charging varies somewhat -- I've had it still claim to be charging all the way down to eighty-two percent charge, and by repeatedly opening the battery app over and over again I have been able to get it to notice that it's really not charging all the way up to ninety-one percent, but no higher, and I have to open and close the battery app an increasing number of times for every percent that it goes up over eighty-seven before it will notice it's not charging.
Any idea what kind of damage I'm looking at? How to fix it? Whether I can get the warranty people to fix it free of charge? If yes, whether they will send me a new one or just fix the one I have? Whether it's worth getting fixed since it mostly still works, and doesn't really bother me as long as it doesn't get worse?
Nothing?
Nothing from anyone?
Try replacing the internal USB plug? About $25. Easy to do your self.
I have a really weird problem running Windows 8.1 whilst using my Galaxy S 5.
The phone, when plugged into any USB port keeps disconnecting and reconnecting like 2 times a second...
Things I've tried:
1. Different USB cables including USB 2 and USB 3.
2. Different ports.
3. Disabling 'turn off device to save power' in all USB hubs/devices through Device Manager.
4. Using 'High Performance' power mode and ensuring all 'turn off USB devices to save power' options are set to 'No'.
5. Reinstalling the Kies 3 drivers and software.
Here is a video of the issue:
https://www.youtube.com/watch?v=o6tuCp7QNJI
Does anyone else have any ideas? This happens all the time on my laptop...
Yep, happens with mine too, and happens with my nephews S3 too
Also disabled power saving for USB etc
Seems to help if you switch between USB debugging and back again a couple times while it's connected
Is there anything like a proper fix for this? Does the problem stop on Lollipop?
tried a lot
cant connect ....
With the stock charger?
I put the S5 on my trusty 8A 5-port Anker, and immediately noticed this. If you leave the S5 alone, it will settle to constant charging at max amperage, according to Battery Monitor Widget's log.
Nevertheless, I haven't seen such before, not even with my Note 10.1 2014, which uses the same charge mode.
Powered USB hub
leijonasisu said:
I have a really weird problem running Windows 8.1 whilst using my Galaxy S 5.
The phone, when plugged into any USB port keeps disconnecting and reconnecting like 2 times a second...
....
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Click to collapse
I've been fighting the exact same problem.
While I _believe_ there should be a software solution for this, since it wasn't always a problem, I believe it to be power related and have gone for a hardware solution.
The definitive cure for me (as of this morning) was to purchase an external *powered* USB hub.
(FWIW, an Ativa Mobil IT "Travel" 7-port USB 2.0 hub from Office Depot. And only because that was the only model where it could be tested before purchase without destroying the packaging).
Hi all,
all computers stopped recognizing my N4 as an usb device or android debugging device. No notifications pop up on the phone when connected too.
I tried 2 different PCs and 4 cables.
Fiddling with the phone, I discovered that it shows AC charging (in ampere app) instead of USB charging, and it's pulling 700+ mah, which I think it's a bit too high for an usb charge.
Is it an hardware problem? What can I try?
Forgot to add that I'm running stock 5.1.1, not rooted.
Attaching some screenshots