USB generally will have four 'signal wires'. Two pairs - each sends data one direction. i.e. Transmit, and Receive.
They can be thought of this way:
TX +
TX -
RX +
RX -
Each is usually shielded. These are very small things. You have to get them all connected right or it won't work.
There's also a ground which is the shield and may have its own inernal wire as well, and a +5V (5 volts DC) line. These also must be repaired.
Unless you have experience soldering and handling very fine wire, it might be as well to find an electronics tech perhaps at a TV shop and ask that person if they can splice or repiar the cable.