Tablet Keeps Turning Off

Discussion in 'Android Tablet Q&A' started by Zentraleinheit, Feb 22, 2014.

  1. Zentraleinheit

    Zentraleinheit Member

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    I Have an Android 4.1.1 Sensis N78 RK30-anpei7008Trsy-user-r4.1.1.4.083 tablet with kernel version 3.0.8+ and build number RK30-anpei7008Trsy-user-r4.0.83.20130106 that I got almost a year ago. Till the weather got colder the tablet worked fine, however, as of the last 2 months it has acted strange.

    For after 5 minutes or so on battery power the tablet shuts down with-out warning. Any attempt at restart just results in shorting the on time before shutdown. Then to the point that tablet "dies" even before getting to what I call "the unlock page."

    The sequence of events usually follow what happen last Thursday night..

    1: Starting at 1% reported battery charge, I recharge the battery on AC.
    2: After about 90 minutes the tablet is charged at 100%
    3: When, come Friday morning, I use the tablet the reported battery charge is at 99%-100 %, but, after 5 minutes there is an abrupt shutdown.
    4: After restarting the tablet the reported battery charge is 18%, then after a minute, the tablet shut down. Any more restart attempts leads nowhere.
    5: After leaving the tablet off for 8 hours I restart it and informed that the recharge level is 80%, but, it still will shut down after 5 minutes
    6: By Saturday morning the tablet again shown 1% battery level, but, after plugging in to my car's cigarette lighter the battery level jumps to 80%. But, after 5 minutes I back at #4.

    Plus, I have also found that if the power cable wire is disbured, the tablet will turn off

    Using a Battery App it reported that:
    Battery Health: Good
    Technology: Li-ion
    Temperatrure: 32.0F
    Voltage: 3.0V

    I been searching on the net, but, found nothing

    Even tried contacting the company, but, my mails keep coming back marked with
    quota exceed.

    I haven't received replies form other sites I have asked





     
    Last edited: Feb 22, 2014
  2. leeshor

    leeshor Senior Member

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    Welcome to the forum

    This is just a wild guess but I'd say there is a problem with a connection in the battery contacts or the charging circuit. The only suggestion I have is to take it apart and check all the connections.
     
  3. Zentraleinheit

    Zentraleinheit Member

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    OK, but, how?

    I beleve that the back just snaps into (and out of) place, but, is there a trick that I shold look out for?

    Plus, one I do get inside, would I notice anything out of place?

    Or out comes the volt reader?
     
  4. leeshor

    leeshor Senior Member

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    I wish I had an answer. The best I can say is eyeball it to see if anything looks loose.
     
  5. Zentraleinheit

    Zentraleinheit Member

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    I got the back off and to my eyes nothing look wrong.

    I took a voltmeter to the battery and it read 3.7v

    If the battery is ok then could something effected the tablet when it was used/stored/recharged in below freezing (20F) weather?
     
  6. leeshor

    leeshor Senior Member

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    Possibly. Go through several deep discharge and charge cycles to see if anything changes. If it is the charging circuit itself it may be difficult to tell.
     
  7. Zentraleinheit

    Zentraleinheit Member

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    Well, I'll try your suggestion and see what happens. If that don't work then this tablet may be heading back home to China for recycling ;)

    However, I do have one more question.

    How do you read Android's built in battery chart?

    I took the screenshot below 1 minute after turning on the tablet (and after it being off for 11 hours and being on AC recharge for 3 hours before that).



    $Screenshot_2014-02-26-10-39-38.JPG


    Yet it shows I been on battery power for over 7 minutes 16 seconds, and what is the 24 minutes 18 seconds notation on the X axis of the graft denote?

     
    Last edited: Feb 27, 2014
  8. casarova

    casarova Junior Member

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    Have you tried a different charger cable?
     

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