Question about AT&T Cingular 3125 Smartphone

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Will not charge or turn on using USB cable.

I do not have the standard wall charger for my 3125 smartphone. I have the USB cable but it will not charge when I plug it in. I don't know what is wrong, the battery? the USB cable? the phone itself? Please help.

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Two things.

HTC phones will not charge from the USB port unless you have ActiveSync on an XP or Mobile Device Manager on a Vista PC loaded.

Second, if the phone has been stored for a very long time, 1 year if initially charged, 1/2 year if not, the the battery self discharges to a point the USB port PC Sync software doesn't know the phone is connected. You must jump start a charge on the battery by either and HTC AC charger, a generic AC/USB charger will not work, or you can apply a +5 VDC voltage to the power terminal, marked + and - on the battery case, on the two outside terminals I believe. This 5VDC must be current limited for safety. The Red and Black lead inside a standard USB cable will supply current limited +5 volts at 100MA. Chop off a standard USB cable, their cheap and break out expose the Red and Black leads. While connected to the PC USB port, hold the Red lead to the + battery terminal and the Black to the (-), or other outside terminal, of about 30 seconds to a minute.

Now when you plug the phone to the PC with a good USB, the Amber light on the phone to indicate Charging, may not come on for a while, 5 minutes or so, but it will eventually. If it does not, jump the battery again for a longer period of time.

An AC charger for the 3125 are fairly inexpensive. $7 or so, on ebay with shipping. This may be the way to go. Consider getting one with a new battery. They are sold this way sometimes and sometimes for little more that the charger alone.


Posted on Feb 27, 2009

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