usb charging problems - Motorola Q

AnothrNmbr · #1 03-04-2008, 12:32 PM

I don't have any problems charging my Q9h when plugging it into a computer, but when I try to use my usb auto adapter or usb AC adapter, the phone does not charge. The same chargers have no problem charging other usb-charged devices like my bluetooth headset. Anybody else experience this problem?

thanks,
ji

smlawrence · #2 03-04-2008, 12:38 PM

Sounds like the power source itself doesn't have the power to charge the phone just the smaller usb-charge devices.

AnothrNmbr · #3 03-04-2008, 12:43 PM

yeah that's what I suspected - but isn't all that low-level electrical stuff standardized as part of the usb spec?

smlawrence · #4 03-04-2008, 05:33 PM

I could be wrong but I think the phone requires more power at a time than say a headset or other smaller usb item.

frwood2000 · #5 03-25-2008, 06:24 PM

I have the same charging problem with my Q 9h.

I've checked the voltage and current on the various chargers that I'm using:

1. The AC charger that came with the Q 9h works and has an output of 5 volts and 850mA (0.85 Amps).
2. The Belkin cigarette lighter DC charger that worked with my Treo, but doesn't work with my Q 9h has an output of 5.5 volts and 700mA (0.7 Amps).
2. The iPod AC charger that works with my iPod, but doesn't work with my Q 9h has an output of 5 volts and 1 A. ***This one should work with no problems.****

There are only 4 pins in the usb connection, 1) Power of 5 volts, 2) ground for the power, 3) data and 4) data.

The only theory I have at the moment is that the PC and the AC charger that came with the Q 9h do something to the data pins to tell the Q 9h to charge.

It's very frustrating.