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Check the convergence IC's for cold solders, check for leaking capacitors in the area. Check the voltage regulator with a Variac.
Usually these sets just need the 2 big convergence IC's replaced with new ones. Clean all 3 picture tube lenses, mirror and screen. Get the original RCA remote that came with the set and MANUALLY align the convergence.
Rarely the bow on the bottom of the screen is not repairable.
You will have to remove all the screws on back of TV Front Bottom panel first then you will have more screws that hold Top on in back and under front screen its not as bad as it sounds it just takes awhile to do while your in their clean your mirror and all 3 top lenses to Tubes.
To clean these lenses is easy with a clean soft cotton cloth in a kindly way. BUT wait a minute: To get access to those lenses is the really hard job. something as you want to see the core of an onion but tobe there you have to take a cover at the time. Trust me: Literally. Step by Step, at least 40 screws. the front screen is the last step, and then you can see those lenses. If the tv is working OK and is the only job needed, ask a technician for a regular cleanning and adjustment you can get surprised about the service cost (NOT REALLY HIGH i mean). make sure he cleans the back mirror also.
It is very rare to have to clean the mirror. It us upside down so it does not collect dust. It does however collect nicotine if there is a smoker in the house. Some RCA mirrors are not glass and should not be touched. The lenses do get dusty and should be cleaned.
Take the screws out of the BACK top panal of tv! be gentle the mirror is connected to this back!.... now after removeing back you will see the inside of screen and the three lenses and on back panel the mirror! clean all three of these and you will see a big change for the better..Then just replace back! (The screen itself does not come out!)
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you first must unscrew the back panel then remove....be carefull!...then you will see the lenses and mirror...use a micro-fiber cloth and mild window cleaner! never touch the lenes with your bare fingers (the oik from your hands will mess up the lenes) (its easty
This unit needs repair your convergence needs alignment, which with the RCA model needs to be done by a tech and the Blue card is either dead or is dying. You need to take it in and evaluate weather or not it is worth repairing or just wpending the money on a new T.V. - You can expect to pay around $350 - $800 to get this repaired, plus pick up and drop off. I would not endevor to do this myself as there are other things that can be damaged when messing with it.
Really it all depends on how handy you are. Yes thes sets do have three lenses and a couple of mirrors that should be cleaned every year or two, and a few tweeks on the screens and focus controls. In my opinion, this should be done by someone who knows what they are doing. A TV set is not a place to be experimenting around inside of.