Picture tube of the television is running out of mercury that is used to display picture on the screen. It does not affect the sound of television as you can even listen voice when your screen is off. The best solution is change the color picture tube to get it back to normal condition.
Please change the CRT Base as a green oxide layer is deposited on anode inside it, which causes sparking and unstable picture.
VIVEK KUMAR
All India Radio
VIVEK KUMAR
All India Radio