Wiring of a USB Y-Connector
If I understood your question correctly, you left the original plugs black wire completely disconnected from the player. By doing this, you severed the ground connection between the player and TV. If your PC and TV had different ground potentials (they almost certainly have due to wire inductance and power supply filter capacitors), the signal wires were subjected to excessive voltages and currents. It is possible that you killed both the DVD players and TVs USB ports.