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Hi, This is a convergence problem and you can set it right by changing the STKs. It is a professional job and i have knowledge of people who ruined their tv by spoiling some miniature surface mounted components close by. You may need to look at pico fuses too. I would say seeek professional help if you not comfortable working with electronics. Check out at www.fixurtvs.com,
Rca Screen ControlThese sets have screen control adjustment usually located behind the speaker grill(pops off -velcro or press tabs) and convergence front board. There are 6 contols on a black molded assembly about 31/2"x21/2" square. adjust only the top controls marked "Screen R G B" the bottom ones are focus Method: -turn on set and let warm up for 30 min at least -switch tv to blank unused video input channel -adjust each control in turn until you see the picture glow (with the corresponding color) and slightly back off the control - repeat for each color - this will increase screen brightness and ballance your color Hope this helped.
Go to menu then setup look for convergence if it is missing on menu then you have a open FUSE/ FL231, But if you have convergence on menu then go into service mode turnTV off then PRESS and hold at same time ch- and vol- wait for set to come on then release TV should now be in Factory settings.