I HAVE 42" LCD AND

Very week meaning that the picture is really dim - not as bright as it used to be?
If this is so the Back Light Lamp Ballast or there are issues with the florescent tubes in the TV. Can be repaired if you wish to spend between $100 to 300 at a good service shop. Call around your area and get some estimates. A Good shop will give you them.
Blessing,
A/V Media Tech Guy