This is a signal from the image of the red and the middle of the collapse of the phenomenon is not like bad screen. Open the machine measure VS.VA. on the screen all the power supply voltage is normal, and then the logic of the motherboard 5V.3.3V normal power supply. Back to the principle of PDP work of reflection, the biggest possible is the logic and X driver board. Because the fault of X in time will cause the bad image and discharge [screen blackening phenomenon to replace the X driver board, try to change the ok.