Question about Samsung SM943N 19" LCD Monitor

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A lot of dead pixels red and blue appeared in upper left corner. Is there any solution to this?

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Not much that can be done about this damage to the monitor, probably in shipping.

Posted on Jul 04, 2010

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What does it mean by dead cells?


I assume this is related to your LCD monitor.
I think you mean dead pixels. The LCD monitor has tiny pixel elements, one for each red, blue, green color and each one of these colored pixels are turnes on by a transistor. When a transistor fails then the colored pixel it controls does not light up. This is a dead pixel and it shows up as a tiny black dot.
If the screen displays a blue screen, a dead blue pixel will appear as a tiny black dot in the blue screen.
You normally would not notice a few dead pixels unless they are grouped together.

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It is what we call a "Shatted Pixel" and you can fix it by flashing your screen

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If the dots are tiny, those are probably dead pixels. The circuitry that drives them is probably degrading over time for some reason. It's obviously defective, dead pixels happens a lot with LCD screens. I would hope it would be covered by warranty, because the only way to fix dead pixels is replacing the screen.

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1 Answer

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The lines appearing on your LCD means it has a defect on the screen.

There are 3 types of pixel defect
1) dead pixel - pixel is always off
2) stuck pixel - pixel is always on
3) hot pixel - pixel is on but in red, green, blue or yellow, can also be a light black color

You can try to fix stuck or hot pixels but dead is dead.
1st method, flashing different colors rapidly:
JSScreenfix.com has a great tool. This is their free java applet or you can download it below.

2nd method, applying pressure to pixel:
Damp paper towel, Small stylus or dull pencil.

3rd method, tapping the pixel:
Pen with cover on or another small, blunt object.


If your laptop is still under warranty, get it replaced. If not you are looking at the most expensive part in a laptop to get replaced. (LCD screens on laptop is roughly equivalent to 40-60% of the total laptop cost

Please rate this if it this helps.

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My Advent TV did the same thing. Blue Screen with a red lock in the upper left corner. Just press and hold the display button for about 10 seconds. It will clearn

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1 Answer

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You would need to have a technician remove the back of the TV and make the adjustment. There are 2 small adjusters that they change to adjust the voltage.

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1 Answer

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some of these panels were mis-calibrated from the factory after not aging long enough. Let the TV run for atleast 2 hours and adjust the Vs and Vscan voltages. When it is blue in the left I have found generally the Vs is about 10 volts too high.

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Black Spot


Dead Pixel Test This free utility enables you to easily test your digital camera for dead and hot pixels. http://www.starzen.com/imaging/deadpixeltest.htm

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