Question about Sharp LC40D78UN 40 in LCD TV

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I have a Sharp LC 40D78UN LCD TV. The brightness flickers high and low constantly. Tried OPC turned to off. Did not help. Messed with contrast and brightness, same problem.

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  • randal_kostk Apr 06, 2011

    This is a new purchase. What are the chances that the cards are bad?

  • randal_kostk Apr 06, 2011

    Thanks for the help.

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  • Sharp Master
  • 11,800 Answers

In this tv the brightness of the screen is actually generated separately, by a set of CCFL / neon tubes. These tubes are powered by an special board, the inverter / ballast one. If the brightness oscillated it means that the high tension generated by the ballast for the neon tubes oscillates - an indication that either the board is faulty or something has gone wrong with the power source of the tv - it cannot longer deliver the necessary power to the ballast board.
To find out what is wrong the voltages in the power source and ballast board must be checked, the faulty board identified and replaced. That requires a good knowledge of electronics, you will probably have to call a repairman.
Or you could just replace the boards and hope it fixes it (like they do in most shops anyway)
http://www.partstore.com/Part/Sharp/Sharp/LC40D78UN/Sharp/Sharp/RDENCA393WJQZ/New.aspx
http://www.partstore.com/Part/Sharp/Sharp/LC40D78UN/Sharp/Sharp/RDENC2611TPZZ/New.aspx

Posted on Apr 06, 2011

  • Azrael SRL Apr 06, 2011

    If it's brand new then the chances are pretty high - if there has been a manufacturing defect it always appears immediately after purchase. Luckily this is why the warranty was invented - call the company that provides it or the dealer, they will fix it for free. And under no circumstance try to fix it yourself or even open the tv - this will completely void the warranty.

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1 Answer

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This can be called Optical picture control and it adjust to suit the room light.

Please read the text below"

Dynamic Backlight Control - One of the nice features of the Sharp AQUOS LC-32D6U is what Sharp calls OPC, a name they use for their dynamic backlight control. You might also see this feature referred to as a dynamic iris on other LCD HDTVs or disguised under some proprietary name, but fundamentally the principle is the same. Its primary function is to try and maintain a high Full On/Off contrast measures the ratio of the light output of an all white image (full on) and the light output of an all black (full off) image. 2) ANSI contrast is measured with a pattern of 16 alternating black and white rectangles. The average light output from the white rectangles is divided by the average light output of the black rectangles to determine the ANSI contrast ratio. When comparing the contrast ratio of video devices make sure you are comparing the same type of contrast. Full On/Off contrast will always be a larger number than ANSI contrast for the same video device.">contrast ratio under any lighting condition. So when room lights come on or off or the sun enters the room, with OPC enabled, the backlight in the LCD will dim or brighten depending on the amount of light in the room. This is managed by a light sensor located on the front of the unit. When OPC is enabled there can be a slight reduction in the dynamic range of the display as the display attempts to maintain contrast and color saturation as room light changes. We had a chance to compare this feature with another LCD HDTV that was of comparable size but without dynamic backlight control, and the Sharp AQUOS LC-32D6U with OPC enabled was the clear preference.

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1 Answer

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1 Answer

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1 Answer

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I'm happy with:

backlight +16
contrast +40
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shaprness +2

although I found this setup but haven't tried it yet

backlight +5
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brightness -7
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1 Answer

Flicker


I have the same problem when going to dark scenes from a bright scene or during channel changes. Sharp sent a tech under warranty and he installed new software to no avail. He called sharp tech support and they suggested turning on opc. The TV works fine but you must adjust sharpness and contrast to achieve an acceptable picture. I paid $868.00 for the set a Sam's club and will buy an extended warranty. I will not buy another sharp. My 40" sony works perfectly.

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2 Answers

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Yes.
Baclight 80%
Contrast 70%
Brightness 50%
Color 50%-60%
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11 Answers

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