Phillips TV (40pfl4706) with net TV will not accept the new wireless router I had to get. Worked fine with old windstream router but not the new one. All other devices work with new router. TV just keeps giving me a "LAN feature is invalid " response. Any ideas will be appreciated.

Did you change the name of the connection or the type of connection?

Yes... all other devices laptops,roku,tablets accept new connection but not the phillips(net tv) it keeps returning a "non valid LAN " message.

Have you made sure your set is running the latest updates, available here: 40PFL4706/F7 Philips LCD TV 40PFL4706 102cm/40" class Full HD 1080p digital TV with Pixel Precise HD - Philips Support (http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?slg=en&scy=us&ctn=40PFL4706/F7)
Also is the new router setup the same way as the old one ?

Yes routers are the same both from windstream .I will check on updates when I get back in town . Thanks for the ideas.

Got the updates BUT still won't accept wireless however netflix will work if it is wired.

Worth checking the wireless standard you are using.
Like the Nintindo DS only uses 802.11b so often wont connect to more modern routers without adjustment.