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I have a Durabrand 19" tv. It is less than six months old. when you first turn on the set, it is fine. But, after about 5-10 minutes, the screen goes fuzzy and white. You can still see the picture, and the sound is fine, but there is a kind of glow in the image.
Your Having a Problem with the High Voltage Transformer in the Set,You can pull the Back off(Not Advised)And you will find two controls on the Flyback*The Flyback is the Unit that has a Red Wire coming out of it Going to the Top of the picture Tube,with the set on adjust the One contol that says Screen,Till the Picture is Normal....Good Luck
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You will need to open it up, first thing to look will capacitors int ehpower supply, main AC fuse. http://s807.photobucket.com/home/budm/allalbums
Please verify if it is only six month old, otherwise, take it back to where you get it from.
you have a shorted green CRT that is affecting the other crts the short is internat to the crt that leaves what is called retrace lines. if the set is more than three years old then replace all three guns.
Screen works you get a black and white image.
The colour stage works you get colour output to TV
So my guess is the ribbon connector from motherboard to screen is loose or adrift.
Is this something you fell you can fix or 'know a man that can?'
It sounds like the circuitry which actuates the color drives for the screen are not working, this would ba analogous to adjusting for a B&W picture on a color TV you have color but the screen shows black and white. I would get a schematic for this set and measure the voltages on the color processor that connects to the screen since you know that the external jack has color. If possible I can help you troubleshoot this, if you need me to help out.