Apparatus for self-diagnosing a video signal in an LCD panel and a method thereof

A method of self-diagnosing whether or not a video signal inputted from a PC is in trouble in an LCD panel, the method comprising the steps of:

• (a) providing a digital test video signal having a predetermined display pattern through a micro-controller of an LCD driving circuit;
• (b) feeding back the test video signal to the micro-controller via an A/D converter, a receiver and a scaler;
• and
• (c) determining whether or not the test video signal is in trouble by comparing the test video signal from the micro-controller with the video signal fed back to the micro-controller.

A method of self-diagnosing whether or not a video signal from a PC to an LCD panel is in trouble, the method comprising steps of:

• (a) providing a switching control signal through a micro-controller of an LCD driving circuit, said switching control signal representing an operation mode of the LCD driving circuit composed of a self-diagnosis mode and a normal operation mode;
• (b) if the operation mode is the self-diagnosis mode,
• providing a test video signal having a predetermined display pattern through the micro-controller,
• feeding back the test video signal to the micro-controller via an A/D converter, a receiver and a scaler of the LCD driving circuit, and
• determining whether or not the test video signal is in trouble by comparing the test video signal from the micro-controller with the video signal fed back to the micro-controller;
• and
• (c) if the operation mode of the LCD driving circuit is in normal operation mode, receiving the video signal from the PC, converting the video signal into a signal having a format suitable for the LCD panel, and outputting the video signal to the LCD panel to display the video signal from the PC on the LCD panel.