Contributor
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2 Messages
Signal input 60Hz only. How to change the Hz input setting
I have a UNC558000 LED Samsung TV, just got DTV hooked up today. I'm having problems with only 60Hz input, I cannot set the HD DVR to have input signal of higher than 60Hz. My TV can process signal up to 240Hz. What am I doing wrong? I change change the resolution from the HD DVR from 480i to 1080i/1080p, but the Hz only stay at 60Hz. Why is this? Someone please help. Thanks.
blisme
Scholar
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127 Messages
13 years ago
the rate from the DTV box will input to your TV at 60 and the tv will read and update at 240. not to worry. this tv's 240 refresh rate is an internal process and not one of input.
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litzdog911
ACE - Sage
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46.4K Messages
13 years ago
All of these broadcast video standards are 60Hz refresh rates. The "240Hz" that your LCD provides is an upconversion performed within your TV to help minimize motion artifacts from fast moving video images. It has nothing to do with the "incoming" video signal into your TV.
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dcd
Expert
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20.7K Messages
13 years ago
And, if you have oddities in the video of the TV, try turning the 240 system on the TV off.
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TexasBrit
ACE - Expert
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14.1K Messages
13 years ago
Many people get confused by this, and the manufacturers don't help, they do this deliberately because it makes for good marketing. All signals are at 60Hz, whether it's from DirecTV or any other provider, or other sources such as Bluray. Newer LCD TVs have electronics that take the 60Hz signal and create a 120Hz or 240Hz signal from it. Since there's only 60Hz of data the 120/240Hz signal actually going to the display contains frames that have been created inside the TV (usually by "frame interpolation", which means taking two frames and trying to calculate the non-existent frame that would have been between them), and are not in the original signal. The theory is that by increasing the refresh rate, fast motion will be less blurry. But if motion blur comes from the source (for example in sports) then increasing the refresh rate will have no effect. Another problem with increasing the refresh rate is that movies originally filmed at 24fps (most film-based movies are 24fps) can look artificial and not the way the director originally intended. And as dcd says, going to 120/240Hz can introduce video artifacts (even headaches) in some cases that can only be removed by switching the enhancement circuitry off.
FYI, the plasma manufacturers have joined the "refresh rate" war by quoting their own refresh rates, you'll see things like "480Hz subfield drive". It's meaningless, and can't be compared with the refresh rate on LCDs, because plasma is a phosphor-based technology not made up of individual pixels like LCD.
There's lots of info about this on the web, although some of it gets confused by the same issues.
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walker2012
Contributor
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2 Messages
13 years ago
Thank you all for the help, I am now a bit more edumecated. 🙂
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