It sounds like a convergence problem; in the customer menu there is a way to confirm----if red or blue are skewed and will not adjust in some area of the picture you need to replace both convergence chips--the model indicated uses two of the STK-392-110 chips.
Not the most easy set to do this repair on; involves getting at them and replacing both.
Total parts cost should be under 30 dollars on Ebay.
Answers & Comments
It sounds like a convergence problem; in the customer menu there is a way to confirm----if red or blue are skewed and will not adjust in some area of the picture you need to replace both convergence chips--the model indicated uses two of the STK-392-110 chips.
Not the most easy set to do this repair on; involves getting at them and replacing both.
Total parts cost should be under 30 dollars on Ebay.
SD TECH