Can not see the above has been shown "no signal, please check the signal input cable" more
USB extension line is too long lead to serious signal attenuation, not the power of things, you do not see the Internet cafes with a coaxial cable signal line
It is because the USB output voltage is low, coupled with the extension line resistance is large, resulting in the camera that voltage is too low, the camera can not work properly. You can then pick up the USB cable in the power line to find out the cut, in which a series of diodes, is connected to the computer USB port side, and then the external 5V power supply (must be the regulator after the 5V) positive connected to the diode negative And with the USB cable in the other end of the power cord connected to the negative USB cable connected to the negative, so OK
