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there seems to be a problem in the horizontal circuit...there is a control on the flyback transformer that is labeled "screen". (you'll have to take the back off) The flyback is the component that looks sort of round with the red high voltage lead coming out the top and connecting to the top of the picture tube.On the back of the flyback there will be 2 or 3 controls if 2 there will be 1 focus and 1 screen, if 3 there are 2 focus and 1 screen..using an insulated flat blade screwdriver, slowly turn the screen control counterclockwise to see if this will make the lines go away...if not then there is a horizontal cicuit fault and quit possibly a pincushion problem(hourglass effect)..these will need to be checked by a service shop
Convergence ICs you need two of them STK392-110 you can get replacement ICs at the following link with free instalation instructions with pictures so you can do the job yourself. Here's the link.
Pulling in from the sides usually results from poor regulation or width problems related to the horizontal circiut. These are not usually repaireable by a non technician.
may have blown your convergence, does it look like all 3 colors are hourglass or is it just one. If all 3 are bad and it is on the sides it may be a pincushon problem, I dont think you have an adjustment problem I think you have a part failure. If this set is older than about 5 years old it may be starting to have issues with the CRT coolant and the blue may be getting blury, the blue and green will need to be changed also. I would definitly call someone on this to make sure that you get all your bases covered as Fluid is conductive and can cause all kinds of issues up to fire hazzard. (of course that is if it is leaking, and that could be what caused your hourglass issue.)
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