USB Charging?

Discussion in 'Coby Generation 2 Technical' started by pingram3541, Jun 23, 2011.

  1. pingram3541

    pingram3541 Member

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    USB charging anyone?

    Mine no worky, hoping this is not a glitch or limitation and there is a work-around.

    Then again, I notice my camera wayyyy off..may face isn't centered when looking from the center. It's off to the left BIG TIME. I have to frigging hold the thing so far to the side, when grinning, I look like Jack Nicholson from The Shining! Whoah!

    Anyways. would love some input.
     
  2. Spider

    Spider Administrator Staff Member

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    Most USB ports don't have enough power to charge a tablet. You might try a port on the back of your PC, sometimes they provide more power than the front facing ones. Or try a powered hub.
     
  3. pingram3541

    pingram3541 Member

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    Hmm, a 3.0 port puts out more power..up to 80% for cnfigured devices. I also think it consumes less (robbing from ps) but yet my tablet still no red flashing charge light. =(
     
  4. Spider

    Spider Administrator Staff Member

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    I guess you're right then, yours no worky. :( Don't feel bad though, most don't.
     
  5. mrnobones

    mrnobones Member

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    Mine doesn't usb charge either.

    Sent from my MID7024 using Android Tablet Forum
     
  6. TuleenDonai

    TuleenDonai Member

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    For USB 3.0 power support, you need a USB 3.0 cable ALL THE WAY TO THE TABLET. A 3.0 cable has extra power pins.

    Most Tablets are shipping with USB 2.0 cables.

    Sent from my SPH-P100 using Android Tablet Forum
     
  7. Ray50

    Ray50 Member

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    I charge a MID8024 at work sometimes using a bench adjustable power supply. It draws about 1500ma from the supply. USB 2.0 has a 500ma limit and USB 3.0 has a 900ma limit.

    From Wikipedia:
    A maximum of 5 unit loads (500 mA) can be drawn from a port in USB 2.0, which was raised to 6 (900 mA) in USB 3.0.
     
  8. gwammy

    gwammy Member

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    I think I found the problem. I recognized it as soon as I opened the package about 20 minutes ago.

    The power plug says "DC 9V". USB is @5V. My guess (as a hardware designer) is that the batteries are double stacked (series) LI-Ion @~7.4V.

    My guess is that the 5V rail coming from the USB port goes nowhere on the inside of this thing as it would not be high enough to do anything of substance. They could have put a boost circuit in there to charge the batteries off of USB, but keep in mind that this is a sub-$200 tablet and they probably cut every corner they could.
     

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