Display circuit board of a heat dissipation system

A display circuit board of a heat dissipation system which includes a fan tray, a control circuit board disposed on the fan tray for controlling operations of the heat dissipation system, a plurality of fans disposed on a bottom board of the fan tray, and a display circuit board disposed on one side of the fan tray;

• the display circuit board comprising:
• a plurality of light emitting diodes (LEDs) fixedly disposed on the display circuit board for displaying operating conditions of the heat dissipation system;
• a thermal sensor fixedly disposed on the display circuit board for detecting the surrounding temperature of the heat dissipation system;
• and
• a connector fixedly disposed on the display circuit board connecting to at least one signal transmitting cable for transmitting signals between the display circuit board and the control circuit board;
• wherein the thermal sensor detects the surrounding temperature of the heat dissipation system and through the signal transmitting cable transmits a temperature signal to the control circuit board which modulates the rotation speeds of the fans based on the temperature signal, operating conditions of the fans being transmitted through the signal transmitting cable by means of a plurality of display signals to the corresponding light emitting diodes.