Flickering tv screen when playing playstation games.
I don't think it's a configuration problem at all. I do think that the set is not adjusting to the correct format.
Most Stores have 30 day return policy. If it's over 30 days then they may not take it back. If you bought it online, then, the return may be difficult.
If the return is not possible, then, contact Toshiba online and find a local Toshiba authorized servicer in your area.
Hope this helps.