Check the horizontal frequency and the electrolytic filters used in it. damm sure there must be filter that make it look like a concave. also check it by decreasing the width from the service mannual of processor. there is a service switch for every processor. that is his internal control unit. may be it is from the processor adjustment. you can set it by increasing or decreasing the frequency or display width-height clock pulse from the processor. to know about that perticular switch you must concern to the company....
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First pull back Look for screen and focus block you will have 3 controls ontop for focus and 3 controls below for adjusting screen drive to each Tube R/G/B
turn color off on Menu NOW try to Adjust the red,greenand blue screen drives as close asyou can to a Black and White picture then turn Color back on in Menu also adjust Focus for each Tube Be sure to Clean Top of Tube Lenses of dust&dirt Just in case Post me your Model and Chassis Number it will be on back of TV some RCA Focus&screen drive Block maybe in front of TV if so remove front bottom panel their you will see control box.
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.
sounds like your color guns are out of alignment and need adjusting. its a cheap fix with a tv tech but i wouldnt recommend doing it yourself. plus, a visit from a tech can tell you if there is anything else wrong/about to b wrong
Convergence problems. FIrst try going into customer setup and seeing if convergence options are there and if adjustments can be made. unfortunately when the picture is bowed like that it idicates a complete loss of convergence which idicates one of three boards have gone bad.
The six controls you appear to be adjusting are the screen and focus controls for each of the three picture tubes. These usually only have to be adjusted as each picture tube ages or when replaced. You may either have a defective "focus block" i.e. the black box you have been adjusting, or the CRT's themselves may be going bad at this age. You will probably be money ahead to just replace the TV with a new HDTV set. At 13 years old, it shouldn't have much life left in it anyhow.