Display apparatus and method of operating same

A display apparatus comprising:

• a first power supply connected to an external power source;
• an input interface, comprising circuitry, configured to receive a turn-on command for turning on the display apparatus or a turn-off command for turning off the display apparatus;
• a main module, comprising circuitry, configured to control the display apparatus and to operate at an operation voltage;
• a second power supply connected to the external power source and including a controller, comprising control circuitry, configured to operate at a standby voltage, the second power supply configured to generate the operation voltage for operation of the main module and the standby voltage for operation of the controller;
• a first switch connected between a terminal of the operation voltage generated by the second power supply and the main module and controllable by the controller according to a first switch control signal;
• a second switch connected between the external power source and the first power supply and controllable by the controller according to a second switch control signal;
• and
• a feedback circuit configured to output a feedback signal based on the operation voltage being out of a specified range,
• wherein the controller is configured, based on the turn-off command being received by the input interface, to:
• output the first switch control signal to open the first switch,
• output the second switch control signal to open the second switch, and
• output a feedback circuit control signal to turn off the feedback circuit, based on the outputting of the second switch control signal to open the second switch.