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Old 01-28-2010, 11:27 AM   #1
mack 120
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Device: Kindle 2, iPad, Samsung NC10, IPhone 3GS, iMac, Sony PRS505 (broke)
USB uk

Hi
Wonder if anybody can shed any light on this.
USB that came with Kindles works when connected to computer and used via and japanese adapter socket. All good.

I charge my iphone from a via a USB cigarette socket in the car, no problems.

The problem arises when i use the USB that came with the Kindle in the car charger, light comes on then when screensaver kicks in it stops the charging??
Have bought a uk retractable USB (thinks if for a nokia) same problem starts to charge then the screen saver kicks in and stops charging???


Any comments welcomed. It would just be nice to be able to charge when mobile

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Old 01-29-2010, 04:09 AM   #2
parsi
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This can happen if the charger isn't supplying enough current or if the device thinks it's not being supplied.

However there is a hack to short the data lines which gets over that problem. I've used it to enable my N85 to charge using a blackberry cable from a USB charger.

http://en.wikipedia.org/wiki/Universal_Serial_Bus#Power

"The Dedicated Charging Port shorts the D+ and D- pins with a resistance of at most 200Ω. The short disables data transfer, but allows devices to detect the Dedicated Charging Port and allows very simple, high current chargers to be manufactured."

What is is effectively is identify the data lines (white/green???) and join them so that they are running from the usb socket back to the socket.

I'm attaching a very badly drawn sketch which might help...
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