This is yet another great topic for a content site based around adsense. As usual, go into Nichebot.com and have a look at how many searches are done for this keyword.
The secret to getting a lot of searches and a lot of high rankings will be creating hundreds and hundreds of pages of content for keywords that are not so competitive.
You can write reviews for every type of TV there is out there.• LCD
• Plasma
• Widescreen
• Rear Projection
You get about 15 main keywords for LCD, and then each main keyword has all these sub keywords which you will create pages for.