The USB ports are located on the back side of the monitor, below the plastic cover and metallic panel; on the lower left hand side.

The first step is to remove the plastic cover panel.

To do so, remove the three 2mm hex screws on the monitor's stand, as well as the four 2mm hex screws located on the four corners of the back plastic cover panel.

For additional help removing the back panel, refer to the repair guide for the LCD Main Board.