Hello friend, Thank you for posting your question on Just Answer! I will be happy to help you with this problem, And possibly help you save on these Labor charges today, So please don't Accept my answer unless you are satisfied, Can you please give us some more information so I can better answer your question?
How old is the set?
Has any work been performed?
Can I have your model?
have you any Television electronics experience?
Do you have a meter and Tools?
Are to trying to repair your Self?
Just know what to say to the tech, to keep from getting ripped off?
This is possibly the Lamp ballast,, it may not be producing the correct voltage,, for the Lamp
Its the Lamp