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Old 27-08-2007, 09:27 AM
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boz boz is offline
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Join Date: May 2007
Location: East of England U.K.
Posts: 11,690
Re: Black Satin & problem with car charger

Most HTC devices will ONLY charge when the usb port on the hermes detects a valid signal source. Now what does this mean. well its two things:

1) Your phone always charges when you have it synced to your PC as the phone detects that there is sata being transmitted to it - hence it is a valid signal source because of the data transmission.

2) If there is no data, SPECIFIC HERMES Chargers fool the device to think there is a valid signal source. This is achieved by a hardware confiuration in the miniusb male jack. The jack has 5 pins in which only 4 of them have a function (Voltage, Ground and two pins for serial data). The left over pin has got no function but what the HTC hermes checks for is if this pin is also connected to Ground (or in other words, not just a floating pin). All specific hermer charges have the left over pin connected to ground. NON Specific hermes chargers will intermittently work, ie if you SR your device or if the screen is off.

Now people have modified a plain old usb charger (or in my case, a plain old usb cable that connects into a car charger with a usb slot). Well we are lucky that the left over pin is right next to the ground pin so i removed the plastic housing, shorted the two pins with some solder and then used som CABLE Shrink to finish it off neatly.

You want some advice, go buy a Specific hermes charger and not ebay generic stuff. HTC want to get your business.


mini USB cable
....___________
....I.....................I
....I.....................I
.../..1...2...3...4..5..\
./_______________\

1 VCC Red +5 VDC
2 D- White Data -
3 D+ Green Data +
4 Nothing
5 GND Black Ground

Solder cable 4 to cable 5.
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