Occasionally, on large widescreen crt TV's, the manufacturer includes a picture tilt adjustment sometimes called geometric adjustment. If it's there, it should be stated in the instruction book, or check under the control flap on the TV for the feature.
Don't know the model but not aware of Toshiba including the feature on their TV's (at least not in the UK models).
Ask your dealer, or contact Toshiba direct to verify if there is such adjustment. If there isn't then it's possible the scan coils are misaligned on the cathode ray tube. If it's that noticable, especially on a new TV, I would insist that the dealer replace the product or repair it free of charge. The tube is the most expensive component in the TV. I wouldn't accept a sub-standard product.
Cobweb, July 2005