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BBC High Definition test card

The BBC are now providing a test card to set up your HDTV

The BBC are now providing a test card to set up your HDTV
published on UK Free TV

If you have a HDTV with Freesat or Sky HD, you may need to adjust your set or amplifier to get the best possible HDTV picture.

The BBC HD channel now provides a testcard and audio signal to help you do this, see A Christmas Present from the HD Channel! BBC Internet Blog.

But, as they point out, DO NOT leave the test card on screen for more than 2 minutes if your screen is less than three months old or more than 5 minutes on older screens. Make sure you go back to the promo for several minutes before using the test card again.

Help with High Definition?
In this section
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Five tips for when you are buying a new TV to watch Freeview or Freesat3
Why do less than one in five people with an HD set watch in HD?4
All five public service channels now free to air!5
Will we ever have Freeview Ultra HD or Freesat Ultra HD?6

Sunday, 23 December 2012
5:08 PM


I believe it was a widespread myth for a while that transmissive displays like LCD weren't subject to burn-in - or rather image persistence, as it should more accurately be described - but in my view it would really be more precise to say that they are less subject to burn-in, as the words ?EUR~on the whole?EUR(TM) in the last line of your kind response imply.

The effect with LCD displays is similar in appearance to CRT burn-in and is the result of the constant voltage produced by a static image causing the crystal voltage-response curve to change, which results in them letting more (or less) backlight through when compared with surrounding pixels. OK, technically it?EUR(TM)s not burn-in but the effect, which can occur after just a few hours, is very similar.

There are several things you can do to effect some sort of ?EUR~cure?EUR(TM) for image persistence (just Google!) ?EUR" but at the end of the day prevention is better. Whilst screen dimming will help reduce burn-in with the old CRT displays, dimming or darkening an LCD backlight won't help preserve your pixels!

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