Looks like a dirty smudged screen, but some light backgrounds are clear and some look as if the screen has been smudged by an improper chemical cleaner? Could this be a pixel issue? I have only cleaned it once or twice and I used the proper screen cleaner.
Also, it takes several clicks to turn the set on and off even though I have fresh batteries in the remote.
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Dead and Stuck Pixels
Pixel defects for an LCD monitor are defined as one of two types: dead or stuck. Technically, both types of pixel defects are stuck pixels but it really deals with the electrical currents and the state of each pixel or sub-pixel.
A dead pixel is defined as a pixel or set of sub-pixels that has failed and is permanently in the off position. This condition means that the pixel will not let any light through. This can be observed as a dark or black spot on a brightly colored or white background.
A stuck pixel is defined as a pixel or sub-pixel that has failed and is permanently in the on position. This can be either with a single or multiple sub-pixels for a given pixel and is best observed on a dark or black background. A white pixel means all three sub-pixels have failed while a green, red or blue pixel means one of the sub-pixels has failed.
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There is a slight possibility that one of the mirrors inside your tv got dirty from someone touching it when the lamp was changed. If you want to get into it, you would have to pull the back of the tv off and take a look to see if thats the case. If you do find that its dirty, use an lcd wipe to clean it.
Hi! Does the smudge changes / mooves as you zoom the lens? If so, the smudge is most likely on the focus lens, if not, there's something on the CCD. In both cases the lens will have to be taken apart and cleaned by a professional. I suggest you contact a local repair shop and see how much they ask for it.
Many digital cameras have different settings for the background color, my Samsung L200 for example has a setting that will make the pictures normal, black and white, sepia OR have a red, blue or green tint....you may want to check those settings... Otherwise... check to ensure the lense itself is not smudged... I have seen a smudged/dirty lense cause a similar issue.. what type of camera is it??
dark spot could be a faulty led. if you put a program on that is in white screen you should see all the leds light up the screen. dark spot will be were the led is not working. if on white screen and they all lite up but still dark around the area, it could be the lcd screen. and could be dying pixels. and try this video https://youtu.be/wlA2rcrAOCs