Just caught your LN46B750U1F model number for this 2009 tv from your duplicate post and looked up parts for it .
In case on a failure like yours caused by a lightning strike , I give this an 80% change the main board that cost $130 is the culprit and the other 20% to the $70 power supply circuit .
This would require some voltage testing with a meter to point out the culprit with 100% certainty .
If you are into repairing this yourself then let me know and I`ll help you along with parts and info
If that is not your cup of tea so to speak then to have this repaired at home could cost you around $250 to $300 parts included and perhaps $50 less if you take it to the shop yourself .
If you need to find repair shops near you then look at the link below and enter your zip code ;
This will give you a list of NESDA member repair shops in your area.
This list may be limited though and you may find more by simply using the yellow pages or simply google "tv repairs" and the name of your town .
You could give a call to different shops in your area to get an idea of their rates , it pays to shop around .
but if i may be frank , considering the age of the tv at 7 years old and the fact that you can get a new 50" tv with all the bells and whistles for around or less than $500 ,I would think twice before investing that kind of money into this one.
I think your money would be better invested in a new tv .
Let me know if you have other questions and if not then please do not forget to rate by clicking on the star icons at the top, then click on Submit so i get paid for my time helping you .
Also note that it will not close this post , you can come back here at any time if you need further info or help .