i have an problem with all chargers with an usb port.... when i try to connect the original usb cable my n900 wont charge.... but an iphone will ....

for some mobile devices it works when you short the data + and data - wires on the phone side from the usb cable....

how do the original one work?? will that shorting trick help?? i 'm in the forest and cant work that out....

The phone needs to see a short (or low resistance) on the data pins in order to recognise it as a charger and not a computer. I usually modify the charger rather than the cable though (otherwise the cable is useless for data transfer).

i cant modify the charger.... becus i dont have any tools.... and thx for the advice....

i ve the cable which came with the n900....

it has 4 wires... red black white green.... which ones are data + and data -??

edit:

red 5v
white data -
green data +
blk gnd