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A Charging Mystery

Discussion in 'Android Lounge' started by shaude, Jan 24, 2014.

  1. shaude

    shaude Lurker
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    I hope someone can help me to solve this. :mad:

    I have a 7" android tablet with a short Micro OTG cable plugged in which ends in a full size female USB socket. All works well through this socket, keyboard, mouse, memory sticks etc. The thing driving me mad is that I cannot charge the tablet on this female socket. I've tried all manner of OTG cables and USB cables and nothing works for charging the tablet. I can only charge directly to the tablet's micro socket.

    My aim in this is to prevent constantly having to plug/unplug from the tablet itself.

    I have an Adspec Adtab 7 with Jellybean 4.2, Dual Core Cortex 1.5ghz

    Any advice gratefully received
     

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  2. funkylogik

    funkylogik share the love peeps ;)
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    Im no expert mate but maybe the pins that would normally charge the phone are disconnected in OTG?
     
  3. shaude

    shaude Lurker
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    Thanks for that friend. It's what I suspected. But surely there must be somewhere a micro OTG lead where the pins ARE connected.

    PS. I'm handy with the soldering iron - I think!
     
  4. Slug

    Slug Check six!
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    USB-OTG cables normally have a Micro-A plug, which when inserted tells the device to assume the role of host. As the host is responsible for powering the USB interface I don't think charging is possible.

    A Micro-A to Micro-B adaptor might work, if such a thing exists, but I wouldn't like to speculate on the reliability (or electrical safety) of such a bodge. It's always best to use the correct tools for the job.
     
    funkylogik likes this.
  5. shaude

    shaude Lurker
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    I've just stanley-knifed each end of an old OTG micro cable.
    All four wires on the micro end AND the female USB end are connected.
    Colours red, white, yellow, black.

    On a USB cable they are red, white, green, black.

    But the red and black are always at each end and I assume these have the charging current. So all four wires are being connected. But it remains a mystery why it won't charge.
     
  6. shaude

    shaude Lurker
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    Thank you most kindly. I always bow down to superior knowledge!
    I now resign myself to the carefully explained situation and will just use the charger as instructed.
     
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  7. Slug

    Slug Check six!
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    Hmm, someone is being naughty.... yellow isn't used in any official USB spec. :thinking:

    I can't claim that, it's only what I remember from reading various docs about the USB specs. :eek:
     
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