Hello Jess:
This is a convergence power supply issue, on the deflection board, this is the board to the left looking from the back of the set with the back off, toward the end of the board nearest the back there are three micro fuses, usually green in color or yellow check these fuses first if any are open then resolder all the terminals on the flyback transformer and related areas for cold or open solder joints, if after this the convergence is still bad then replace the convergence power supply it is mounted above the board you just checked.
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