Try this:
Liftup the frontflap of the set. hold down the v- button, whilst holding the v- button, pickup the remote and push the 0(vcr) button 3 times in 1 second intervals. give it a couple of seconds and it will bring up the service menu. DO NOT MESS WITH ANY SETTINGS.
Just look in the bottom right hand side for hours( it will also tell you how many times you've switched on your set).