Hello All. I thought I'd post my experiences on how to set up this TV to get the best out of it. I do hope this helps.
These telly's have a number of inputs and for each input there are five preset Viewing Modes which can be customized. Every input stores its Viewing Modes separately from the other inputs, and so all the inputs are independently customizable in terms of their five Viewing Modes. So first you have to select an input to customize, then go to the Picture Setting menu and select the Viewing Mode you want to customize for that input. You'll have to do this for every input that you'll be using. Sound setting are also stored independently per input. Although this may sound long winded, the end result is that different sources can all have their own optimized video and sound settings, which will kick in automatically once set up.
Like many LED TV's the firmware moves the backlight up and down depending on its analysis of what's on screen, and this behavior unfortunately cannot be totally disabled on this model. Fortunately, these backlight shifts are fairly subtle in the first two viewing modes (Dynamic and Normal). The other three viewing modes should be avoided as they do suffer from very pronounced automatic backlight shifts. For each input I have customized the Normal viewing mode (selected for everyday use), and the Dynamic viewing mode (which I switch to on the rare occasions when the content may require a bit of a brightness boost). Once set up, you can simply leave each input on its customized Normal Mode for most of the time.
Be aware that on this model selecting a different colour temperature will result in quite dramatic changes in the contrast and gamma profile of the display. My setting will only deliver if you stick with the normal Colour Balance setting. The other Colour Balance setting have proved very difficult to calibrate effectively on this set, particularly the Warm setting. Anyway, here's what I have settled on:
INTERNAL TV TUNER USE
Customized Normal Picture Mode: Backlight = 70, Contrast = 80, Brightness = -3, Colour = 48, Sharpness = 35, Colour Balance = Normal, Eco = Off , PNR = Off, Overscan = Off.
Customized Dynamic Picture Mode: Backlight = 73, Contrast = 83, Brightness = -6, Colour = 45, Sharpness = 35, Colour Balance = Normal, Eco = Off , PNR = Off, Overscan = Off.
HDMI INPUT USE
Customized Normal Picture Mode: Backlight = 70, Contrast = 80, Brightness = -5, Colour = 43, Sharpness = 30, Colour Balance = Normal, Eco = Off , PNR = Off, Overscan = Off.
Customized Dynamic Picture Mode: Backlight = 85, Contrast = 85, Brightness = -6, Colour = 44, Sharpness = 30, Colour Balance = Normal, Eco = Off , PNR = Off, Overscan = Off.
Mode = Music, Bass = 0, Treble = 0, Balance = 0, Headphone Volume = 27, Surround = off, Auto Gain = off, Volume Correction = 0 (raise this if your input source has a very low volume), Speaker Dist = over 30cm. The rest you can leave at default.
On my particular set these setting deliver about the best you can squeeze out of the TV from a range of sources. My two HDMI Modes are quite broad so as to cover the sometimes duller internet streams that my XBMC box will deliver throught the HDMI. Its possible that your experience may vary of course, as it's not uncommon for there to be panel differences within a product range.
Best of Luck.