I hava a 55 inch . That now has a shadow and the

It is possible that the bulb might be going out. if this is a DLP television the bulbs are usually oinly good for 2 to 3 years depending on how much teleivision you watch. You can buy them online or from the store you purchased the telivision from. They are loacted at the back of the tv and can be changed using a screwdriver. They usually cost between $130 to $200 dollars depending on bulb make and where you buy it.