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The problem is in the picture tube board circuit. Sometimes the CRT socket doesnt connect well to the CRT pins. Or maybe there have bad solders from RGB transistors. check those transistors, Also the bad thermistor discolored the entire tv screen.
When the tv is it totally black and white and the tv picture are good and clear wright?when the tv colors are fade in and out are clear up and when the tv picture it is in colors it is look good normal picture wright?Tv have no shadows of any kinds of colors when picture are good in colors wright?Yes,take ur hand make fist or take a wooden hamer bangs all around the tv bazel frame if the tv colors come back or tv stay in colors it is have good picture in colors.Tv it is still good just have components parts are cold soldering or CRT colors guns R,G,B just require resoldering works only.
Ur tv now power on only have picture few mins,than dead,have sound only?Yes,than the 1 or 2 the long board call the LCD inverter boards are dead.The LCD inverter long boards help the LCD screen to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy 1 or 2 long LCD inverter boards for the replacement.
The tube harnesses may be a little loose and when tube warms they short. Try adjusting the wiring harnesses. (Only attempt to do so if you have electronics knowledge.)
depending on how much you paid for the tv , the cost of the repair may be more than the tv is worth. but if this is a large tv , then the repair would be most likely worth it
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