Are all LCD tvs HDTV?

I have two 26 inch LCD tvs I bought about 3 years ago but they don't have any HDTV markings on them? I know for a fact the 42" plasma downstairs is cause it says HDTV but how can I check with the other two? Ones a Syntax Olevia LT 27 HV and the other is a viewsonic N2750W.

Syntax Olevia LT 27 HV Using component video: 720p, 1080i compatible.

viewsonic N2750W 720 native resolution.

Hey thanks so they are HDTV compatible thank you

From what I found on google anyway.

FYI

720p is considered HD, but 1080i and 1080p will probably be the standard in the future. So, 1080x is the true HD of those 2.

no

True, but anything less than 47", 1080p is a complete waste of money. Most people cannot make out the difference with those sizes of TVs, so don't think you're cutting corners getting a 720p tv. 1080i will never be the standard, because it'* inferior in many ways to 720p. 720p, although it has less pixels (not by much), progressively scans the picture, meaning that instead of having half the screen scan at a time (scan=changing pixels), all pixels scan at the same time. It results in smoother and quicker video. Hope that answers your question that you didn't ask

It looks like they are HDTV ready, but you still need a tuner for HD.

Keep in mind, if you have digital cable, you will likely have a box to go with it, and if that'* the case, then you will NOT need a digital tuner. The only time you use the digital tuner is for antenna or if you're using a cable card (not many people choose that option)

I agree that 1080i is inferior to 720p, but everything I've heard (I'm in the CATV industry) is that 1080x is going to be the standard 'someday'. Whether it be a 'i' or a 'p' on the end is yet to be seen. lol

Also, I agree that you cannot tell a difference between 720p and 1080p. 1080p is definitely a waste of $$$. Unless you are buying a TV that'* bigger than 60-something inches, then I imagine it would start making a difference. But, if you are buying a TV that big, you probably have the coin to get 1080p.