Model #LN55B650T1FXZA SAMSUNG LCD Television

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noise on my tv speakers LN55B650T1FXZA Samsung Lcd tv

A: is always a great resource to find the answers to your parts questions. Your Sears partsdirect expert will research your question and respond within two business days but usually sooner. Thank you for using!

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Julio -
May 24, 2013



I am sorry to hear that your television is making noise and I would like to assist you.  We need to see if the noise occurs from different sources.  By this I mean that a different source, such as a DVD or Bluray should be connected to the television to see if the noise still occurs. 


Please let me know what happens with a different source and I'll be happy to assist you further.


Jerry C

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Jerry C -
Sears Technician
May 30, 2013
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What does contrast ratio mean on my LCD TV?


The contrast ratio is the difference in luminance between the darkest possible color and the brightest. There is no standardized measurement but I am under the assumption that the same manufacturer will attempt to keep the method uniform for a given year between its different models.

An LCD needs a light source behind it to light up the panel. Since the panel cannot completely block out light, true black is actually a very dark shade of gray. Now if that LCD is LED backlit with local dimming, the TV can recognize an area where black is prominent and dim a cluster of LEDs in that section to minimize the luminance. A TV with this technology like the UN55B8500 claims to have a contrast ratio of 7,000,000 to 1. The same size screen with fluorescent tubes instead of LEDs like the LN55B650T1FXZA advertises with a contrast ratio of 100,000 to 1. The number difference is huge but when seen by the user might not be as big of a deal. Also you will see the word dynamic in front of it. This is a now common practice of lowering the intensity of the backlight for darker scenes to stretch out that ratio even farther.

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David A. - Personal Solutions Manager -
Sears Technician
January 05, 2010

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