Does need to pay tax in nepal airport take a 3d lcd tv?

It depends on the value of the TV and whether or not you have already paid taxes on it in another country. If the value of the TV is less than Rs. 50,000, you will not need to pay taxes on it. If the value of the TV is greater than Rs. 50,000, you will need to pay taxes on it according to the customs regulations of Nepal. You can find more information about customs regulations in Nepal on the website of the Nepal Customs Department.