I have a spare f40BT,but before i buy the car-specific parts i want to test if the unit stil works,witch cables do i need te give power to see the unit work?No i used yellow,red and black and the unit boots up (see splash screen) but when normal the main screen appears the screen goes all black,do i need an extra cable?

because the original wiring stayed in the old car i bought a wire harnas from a avic F950BT everything fits,is it maybe therefore the unit doesn't boot up?

I have two units F840BT and F860BT the power connector is the same but the pins inside are in different order. Check twice before you use leads from other player.