Problem with car charger or even with mains power charger is in connector of TyTN. Male mini USB have 5 pins if you look pins from left to right they are: 1- Ground; 2 - not used; 3 - Data+; 4 - Data-; 5 - +5VDC. People from HTC dicided to use pin 2 which normaly is "not used" to recognize original power source. If this pin connected to ground TyTN recognize like good power source and even light of screen is on you can charge device. If this pin floating (not connected) then only with screen turned off you can charge battery. Today i bought from electronic shop mini USB connector, replaced and now can charge TyTN in car during TomTom navigation. Successful soldering :-)
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