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im joel a simple electroncis tech. try to adjust the settings but it does'nt work the i think 3 color inside ( red,blue,green) is one or two of them is deffective.so the best solution try to go the expert tech nothing else
if the option for convergence is still listed under the setting section of the on screen menu, then you need a convergence power supply board. If the convergence option is missing from the menu you need the ITC222 convergence missing repair kit. You can get either one at the following link they include instructions for the repair. http://www.tvrepairworld.com/
This sound like you are having problems with the power supply board. Since you are getting a momentary picture and sound the fuses are good but TVs today have "shorts" and "overvoltage" circuitry build in that will shut it down on errors. Someone knowledgeable in electronics will have to isolate the exact cause.