Most modern TVs are nearly perfect with respect to linearity. There are never
any user adjustments and there may not even be any internal adjustments. See
the sections: Horizontal position, size, and linearity
adjustment and/or Vertical position, size, and
|NotTaR of Television Sets : TV non-linearity
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A sudden change in linearity or a TV that requires a warmup period before
linearity becomes acceptable may have a bad component - probably a capacitor
in the horizontal deflection circuits. For the latter, try some cold spray
or a heatgun to see if you can locate the bad part.