Equipment and connectors
The design of a TV is a very important matter, but make sure the controls and connectors are where you need them. The golden rule says, “the more connections the better,” so think what you want (or plan to) get connected. It is true that the higher end the model the more inputs the TV should have.
If you want to connect headphones to the TV be careful where the headphone output is located, or whether the TV is at all equipped with the output. It happens quite often (especially for ultra-thin TVs), that the design beats the ergonomics, and then the headphone output is hidden somewhere at poorly accessible location between the connectors on the back. Especially with the wall mounted TVs an access to the rear connectors is hard to get to.

Front and Side AV Input
If you want to connect a camera or other video devices directly to the TV, look for more accessible side connectors, the front is practically no longer in use. If they are at the rear, you’ll have to move your TV for every little thing. Side inputs for modern TVs usually contain 1 x HDMI input for connecting a digital camcorder or camera, the less often you see an “obsolete” AV. Newer and better equipped TVs have up to three USB ports or SD card reader.
If you plan to view photos on your TV or play video be sure to get USB input, which can be often also found in less expensive televisions as well, just take a look. At higher end models the USB port also allows to play video from a connected hard disk or even record television shows.

Digital audio output can be really appreciated by  home theater owners, but it may not be needed anymore. TV audio output can now be provided by HDMI input, so the sound is provided over the same cable that provides TV image from a home theater. The function is available by the devices with HDMI 1.4 support.

Most of TV sets (even cheaper ones) have a USB input and SD card reader for viewing digital photos. The more expensive ones also allow for an internet connection either via cable or wirelessly. Depending on your requirements, check your TV set, whether it can read the card from your camera or USB drive.
If you have a home computer where you store photos, better TVs also offer an access to them via a computer network and of course, wirelessly.
In addition, manufacturers offer a variety of Internet applications for internet access or certain services (YouTube, weather, financial news, television archives etc.) Expect, however, that services often vary depending on the manufacturer. However, if you’re interested in some added feature definitely try it at the shop first before you buy. Here, some manufacturers cooperate so that offers may be similar (LG, Sharp, Philips), while other manufacturers offer their own exclusive content.

 How to download movies
Today there are TVs on the market that can play DivX or MKV HD video camera files from USB or network. In all cases, however, check the compatibility, because some TVs cannot cope with all the media files. So if you really take the movies seriously, you’d better be prepared to invest into an external HD player. These specialized devices offer more comfort and compatibility (such as MKV files with 1080p and DTS sound, which televisions usually cannot play correctly).

Blu-ray/DVD players now in addition can also play DivX and MKV files, as well as they can connect an external hard drive or USB flash drive. They also play multimedia files from the network and have no problem with DTS sound. If you have an older home theater, choosing Blu-ray player with integrated surround sound decoders will directly help to improve the whole system.
Do not buy only because of the technical parameters

Your selection of a TV using the manufacturer parameters is just the beginning. Even TV with better technical parameters can have a worse image quality than its weaker competitor. So always look at the overall picture quality.
Never be influenced by in-store high-definition video presentation, which are usually being played in stores. Instead let them show you a regular broadcasting, because that is the only way to find out what you will be watching at home. Ideally, look at the number of programs, e.g.sports (where LCD picture might be blurry) see if you like the colors, try different preset picture modes such as standard or cinema. It’s worth the time to do that; the differences are truly huge.

Do not forget the fact that the store lighting conditions are different than in your room at home. In stores, LCDs usually look better than Plasma whereas at home it might not be the case.

                                                                
                                     More expensive and very thin models may have a lower quality audio.

If you plan to watch movies and shows louder better try the sound quality directly in the store to avoid a disappointment at home. The thinner the TV is, the more problematic it is to deliver a high quality sound.
Also take a look at the remote control ergonomics and see if the buttons aren`t too small – it could be really annoying especially to older people.

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