First I`ll say that this problem is not going away with some reset , adjustments or wiring , your tv needs repair and obviously I cannot be there to do this myself but I can help you along if you are into that .
At this point without being there with tools and meters I give this a 70% chance on the power board and the other 30% on the main board , there would be some troubleshooting to be done with a voltmeter in order to confirm which is the culprit , again if you are into that and own a meter as well as knowing how to use it then I can help you with that .
You can see various parts for this tv at the link below , never mind if they are not in stock , that would be for ID purpose only and from there they could be found with the correct part number , you will have to match yours , more than one version as you will see at this link ; http://www.shopjimmy.com/catalogsearch/result/?q=NS-L37Q-10
If that is not your cup of tea so to speak then to have this repaired at home could cost you around $250included 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 6 or 7 years old and the fact that you can get a new 40" tv with all the bells and whistles for around or less than $300 ,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 .