Juvenut,
I have a similar problem with a Tosh 42WH46. With mine there is a faint red ting to the right hand side of the screen.
This meant that if I was watching football, the pitch on the right of the screen always appeared to be muddy, as most pitches look towards the end of the season, the left was always green. White or very pale white/cream images always had a red ting to them.
I called out the engineers about a month after buying the set to be told it was a convergance problem which would settle down. To cut a long story short the TV developed another problem last week where it appeared to lose the signal from the coax arial feed for 24 hours. Could still view terrestrial signal via the VCR which was connected to the TV via a Scart.
Phoned up the engineers and told them to take the set away and fix both problems. That was last Wednesday and so far no news. Will give them till Thursday and give them a call. Assuming they fix the problem I will let you know what the solution was.
Also check the following thread:
42wh36 yellow discoloration...please advise/help
Kenneth.