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Razr "Unauthorized Charger"

Discussion in 'alt.cellular.verizon' started by Z Man, Oct 24, 2006.

  1. Z Man

    Z Man Guest

    I bought a car cord/charger at a computer show. It fits perfectly, but I get
    a message on the phone that reads "unauthorized charger". I have done some
    research and found that this occurs frequently with after-market chargers,
    and sometimes even with OEM charges. Usually, folks raise this question when
    they plug their phone into the USB port on their computer. I am only
    concerned with car use and charging. Regardless of the message, will the
    phone still drawer power from the car? Will it still charge?



    › See More: Razr "Unauthorized Charger"

  2. SteveC

    SteveC Guest

    Yes
    "Z Man" <z1z@hotmail.com> wrote in message
    news:K6n%g.2857$Wz2.964@trndny09...
    >I bought a car cord/charger at a computer show. It fits perfectly, but I
    >get a message on the phone that reads "unauthorized charger". I have done
    >some research and found that this occurs frequently with after-market
    >chargers, and sometimes even with OEM charges. Usually, folks raise this
    >question when they plug their phone into the USB port on their computer. I
    >am only concerned with car use and charging. Regardless of the message,
    >will the phone still drawer power from the car? Will it still charge?
    >
  3. On 2006-10-24, Z Man <z1z@hotmail.com> wrote:
    > I bought a car cord/charger at a computer show. It fits perfectly, but I get
    > a message on the phone that reads "unauthorized charger". I have done some
    > research and found that this occurs frequently with after-market chargers,
    > and sometimes even with OEM charges. Usually, folks raise this question when
    > they plug their phone into the USB port on their computer. I am only
    > concerned with car use and charging. Regardless of the message, will the
    > phone still drawer power from the car? Will it still charge?


    Here's the problem. The USB specification limits the minimum power
    available from the interface voltage pins to 500 mA at 5 volts, or 2.5W.
    The GSM version of the RAZR, which first adopted the USB charger cable,
    can apparently live with that, but the CDMA phone is more power hungry and
    needs more than 2.5W to charge. The chargers supplied by Motorola will
    deliver significantly more than 500 mA, and as a practical matter a lot
    of other USB chargers and interfaces will too, but with the latter you
    can't count on them to support more than the standard requires. While
    the phone still uses a standard USB jack for the charger, the power
    requirement is non-standard.

    The "unauthorized charger" message is hence telling you that the power
    output of your charger is significantly lower than a Motorola charger
    would provide. It may or may not still charge the phone, you'll have
    to try it to see. If it does charge the phone it will take longer to
    do so than a higher power charger would. If you were sold this charger
    explicitly for use with that phone you got shafted, but otherwise it
    is just an unfortunate incompatibility caused by the non-standard
    power draw those phones need from their USB interface.

    Dennis Ferguson
  4. Mike S.

    Mike S. Guest

    In article <slrnek27l8.91.dcferguson@dennispc.local>,
    Dennis Ferguson <dcferguson@pacbell.net> wrote:
    >On 2006-10-24, Z Man <z1z@hotmail.com> wrote:
    >> I bought a car cord/charger at a computer show. It fits perfectly, but I get
    >> a message on the phone that reads "unauthorized charger". I have done some
    >> research and found that this occurs frequently with after-market chargers,
    >> and sometimes even with OEM charges. Usually, folks raise this question when
    >> they plug their phone into the USB port on their computer. I am only
    >> concerned with car use and charging. Regardless of the message, will the
    >> phone still drawer power from the car? Will it still charge?

    >
    >Here's the problem. The USB specification limits the minimum power
    >available from the interface voltage pins to 500 mA at 5 volts, or 2.5W.
    >The GSM version of the RAZR, which first adopted the USB charger cable,
    >can apparently live with that, but the CDMA phone is more power hungry and
    >needs more than 2.5W to charge. The chargers supplied by Motorola will
    >deliver significantly more than 500 mA, and as a practical matter a lot
    >of other USB chargers and interfaces will too, but with the latter you
    >can't count on them to support more than the standard requires. While
    >the phone still uses a standard USB jack for the charger, the power
    >requirement is non-standard.
    >
    >The "unauthorized charger" message is hence telling you that the power
    >output of your charger is significantly lower than a Motorola charger
    >would provide. It may or may not still charge the phone, you'll have
    >to try it to see. If it does charge the phone it will take longer to
    >do so than a higher power charger would. If you were sold this charger
    >explicitly for use with that phone you got shafted, but otherwise it
    >is just an unfortunate incompatibility caused by the non-standard
    >power draw those phones need from their USB interface.


    I'm not sure that's all there is. My wife has a V3c, and I tried a
    Zip-Linq USB power supply rated 5V @ 1000 mA and got the same error
    message.
  5. This may solve the riddle for whoever is still reading these posts. For
    the past year and a half I have been charging my RAZR V3m from Verizon
    with a mini-USB cable, any cable, my digital camera, the USB floppy,
    etc, I never really checked whether all of them were 4pin or 5pin, so I
    don't have any further information about that.

    So today I come in to work and plug in my cell to the mini usb cable
    that I have been using for at least 2 months (in this particular PC) and
    I get the "unauthorized charger" message, I think.. "WTF?" this has been
    working all along. So I do a little reading in here and a couple of
    other forums and it dawns on me that I changed me USB port on that I was
    connecting to recently. I plug in the USB cable to the other port that I
    was using and voila! the PC recognizes it and loads the drivers, etc etc
    and now it's charging.

    For whatever reason, the 6 USB ports in the back of this PC are split
    in 2 and 4, on the group of 2 I have a laser printer and on the group of
    4 I have a wireless keyboard. Maybe the printer was pulling too much
    juice for the USB to be able to give it to the phone, and obviously, the
    wireless keyboard doesn't pull in too much power.

    So there it is, if you have a mini-USB cable that is able to provide
    power to other devices (USB floppy, etc), it should be able to charge
    your RAZR provided the USB port gives enough power (voltage, amps,
    whatever it is, i am not an EE). Try different USB ports from your
    computer, the ones at the back, the front ports and start with a direct
    connection to the PC instead of using a hub (although an externally
    powered hub may work too).

    I imagine that's where the 5pin USB comes in vs the 4pin, the 4pin
    sounds like it's 1pair receive and 1pair transmit, so only data comes
    through, but the 5th wire may provide the electrical.

    If you want to get a cheap mini USB cable, try getting a Dell mini USB
    cable on ebay, they come in 3ft and 5ft, I got a bunch of 3ft at less
    that $1 each plus shipping and I have one on each laptop bag, one in my
    car and 2 in the office.

    My 2cents, I hope this helps anyone.

    Vince


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