I have RCA P46813BL with a similar problem. I have no picture but good sound. I do get the screen to display the menus and the channel number, so I know the projectors are working, but I tried even hooking up a video game to the video input jacks and still get no picture and good sound. So is this the same case where it could be a bad High Output transister??
The good news is your set has a picture therefore is not an output transistor,the problem your set has is a signal processing problem,no video of any source is being processed,is just a different kind of problem and for that you will need the assistance of a servicer to diagnose,try taping where the cables conect to the tv if the set reacts the loose conection is close to that imput panel but if it does not be safe and call for help.
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