Best tv settings for samsung LE40A457

Use your eyes to determine quality; only they really know. FYI, when determining the best color and tint, when you view the setting, think to yourself, "do people really look like that color in real life"?

Just a couple of things to try:
You say you tried another cable box and a roku. Are you using the same cables? Are you using hdmi, component or coax cables? Could be a bad wire. True high def tv 1080 requires an hdmi cable for the best picture. The next best choice is the component cable. This is a triple cable with red, green, & blue and provides 720 resolution. The least quality is the coax wire which will only provide low def standard quality picture. Sometimes people hook up 1, 2, or all 3 of these choices not knowing what it all means. If thats the case with your tv it may just be a matter of selecting the correct input on your tv with your remote. On your samsung remote there should be a button for input. Try pushing that button and make sure it's set to hdmi or component, whichever your using. If none of this, is it possible the plasma tv itself is defective?

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hi can i just add? I have recently got this tv but for some reason when i set setting to Normal they reset to dynamic?? After about twenty mins? I keep having to change back to normal or if i set it to perfect brightness etc... it just goes back to dynamic again? i.e cell light 100% and contrast up to 100%!

Why is this??

You get best picture on any LCD monitor or TV when the PC video resolution is set to the native resolution of the monitor or TV. You need to look at your user manual to find out what the native resolution is in PC mode.

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Match the PS3's output resolution to your TVs (in this case 720p).
Don't sit too close, otherwise you'll start to see individual pixels.
Make sure the HDMI cable is good quality.
As for picture settings, they will very so much according to the viewing conditions that i cannot give you settings that are gauranteed to work for you. But sharpness should always be 0 when dealing with HD content.
If you want to really get the best picture from your TV, try using a THX disc to calibrate it. Luckily these are normally included on Disney PIXAR DVDs, so go find yourself a copy of CARS or something. Follow the instructions of the THX setup, and you should have youself a sweet looking picture in no time.

Hope this Helps.

You will have to disable one or the other. Most likely the source because not all disk"s will be recorded the same. If a disk was transfered from film to digital poorly, this will show up as a grainy look on your tv, not much you can do about that. I would set your tv the best possible and go with that, also if your tv is capable of 24fps use that setting.tweaktv.com can help you with your tv setting. Use Progressive Mode on you blueray and your dvd also.

Hi - I have some suggestions. The following factors effect picture quality:
1. Source (because LCD TVs have much higher picture quality than traditional CRT "Tube" TVs, the worse your source material, the worse it looks on a LCD TV).
DVD and Sky/Digital TV should look excellent on this TV when connected with a good quality Scart lead (nothing too expensive, but a Oxygen Free Copper Gold lead may help) directly into one of the TV's Scart inputs (avoid using "switching" boxes for multiple equipment).
Also, bear in mind that this is a HUGE screen (40 inches I think) and will REALLY show up bad source material.
The best advice I can give is, if you have HD-ready equipment use HDMI connections for everything (ideally with an HD-uplscaling DVD player which will "improve" the quality of standard DVDs on the TV - I recommend models by Philips) and check that you are in "Movie" or "Cinema" mode on the TV.
Make sure that all of your equipment, like your Sky digibox, is set to 16:9 mode (not 4:3) aswell to preserve the true widescreen aspect ratio.
Hope that helps!

The set may not be at fault. If you are on cable some channels are still in anolog and some are digital. if you are on a nolog channel the picture will look preaty bad compared to the digital ones.

Check this link out. I think it should give you all the info you need for optimal picture settings.
http://help.cnet.com/samsung_LN_T4061/9602-12576_39-0.html?messageID=2510125&tag=tip-2510125&kw=samsung+LN-T4061