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No, the tube is not bad. There are a couple of very small surface mount components mounted by the main microprocessor that could be causing what you are seeing. They are very small and quite hard to unsolder and replace without losing them. The set should be serviced by a qualified tech familiar with the new RCA chassis.
You apparently have a high voltage arc.
Possibly the anode lead to your picture tube.
Also the flyback transformer could be arcing.
If you're not experience with tv repair, you need to have a tech check it for you. The circuits operate at very high voltage and if you get into it you can get a possibly fatal electrical shock.
Be careful !!!
Stargazer
Is unlikely the picture tube is bad,the description of the problem tells me you have a straight line from top to bottom that is an indication of a horizontal deflection problem and is correctable and inexpensive,just in case the line you mention goes from side to side the problem will be in the vertical circuit and is also repairable.To make things easier tap the set on the side just to see if it reacts,don't over do it ,if it does the should be a lot less expensive because it might just be loose conections.Be safe and call for assistance.
I would contact RCA if the repair center dosent know how to troubleshoot this set. But I bet its an eeprom or ground issue. Contact RCA here at 580-634-0151 or At https://www.rca.com/secure/service/contactrca/1,,,00.html Good Luck
typical problem with an older set. sounds like the crts starting to fade as manufactureres Im thinking build into a set faults that they know will happen after a certain time frame and most do this is why there are so many reoccouring falures in a tv sets life. this is simply my thoughts on this subject!! You could have your local tv guy shoot the tube (not with a gun!!) with a crt rejuvenator to maybe clean off the grids of the tube. sometimes this will help BUT its a risk also Sometimes it will ruin the picture tube also. I have a set that I rejuvenated the tube 4 years ago as it looked like crap but to this date s its stil looking good as it did when new!
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