Hi, try this, it fixed my tv with the same problem:
Make certain the TV is receiving a signal.
Press in sequence on the remote [MENU] > [6] >[4] > [8] > [3].
[FACTORY] is displayed.
Press the above sequence again to enter [White Balance] menu.
Press the above sequence again to enter [Adjust] menu.
Press the above sequence again to exit service mode.
Sheree, August 2008