In the dark part of the picture only speckle spotting of various colors appear in a scatter fashion. It doesn't appear that this is happening in other parts of the picture, but maybe I'm just not seeing it. From a distance this isn't noticeable, but up close it is really quite bad. The service company said that this is an inherent problem with plasma but I can't find it on any other plasma TV's the same age as mine - just under 2 years.
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Re: Color Speckling in Dark Part of Picture
The set needs to have an adjustment in the panel voltages. this must be done by a qualified tech. the panel has now gotten it's full aging and now needs to be adjusted. this adjustment does not need to be adjusted again after this has been done.
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try adjusting the voltages on the panel display, the voltages are listed on the label on the panel itself. Adjusting them up or down within 10 to 15 volts should affect that speckling around the picture, if not then the panel will most likely d to be replaced
ISO is not really a "mode", every photo you take has an ISO rating; it's one of the three main ways of controlling how light or dark a photo is. (The other two are shutter speed - how long the sensor is actively capturing for, and aperture - how wide is the hole (aperture) that the light passes through.)
You can think of the ISO rating like a volume control - it's how sensitive the sensor is. At ISO 100 the sensor is at its least sensitive - you get the smoothest picture but you need lots of light to do it. At ISO 800 and higher, your sensor is most sensitive - your camera will take pictures in lower light, but there will be more 'noise' - meaning the speckled effect you get on digital pictures.
It's similar to the volume control on a radio. When you have a strong local station you can turn the volume down, and you'll still get a great quality sound. But if you are trying to pull in a distant station, you turn the volume up and put up with a bit of hiss just to hear what they're saying.
Just the same with a camera. When you have strong sunlight, you can turn the ISO down and you'll get a great picture. But if you're trying to pull in a dark photo, you turn the ISO up and put up with a bit of speckling, just to see the image.
OUCH! LARGE DARK SPOT IN CENTER IS NOT GOOD FOR PROJECTION TV. YOU BURNT THE TUBES. THE LOSS OF COLOR IS THE ROOT CAUSE SOUNDS LIKE A DEFLECTION CIRCUIT PROBLEM. THE TIMING FEEDBACK IS USED TO SYNC THE COLOR CIRCUIT. IF THE TUBES LIGHT WITHOUT DEFLECTION THEY BURN THE CENTER PHOSPHOR COATING INSIDE.
In some cases it is just a matter of making voltage adjustments on a plasma set to get rid of the spots you are seeing. I would look for a reputable technician in your area to see if this is the case. Good luck...
The speckling is caused by the CTRL board. The firmware needs to be updated. Unfortunately LG does not provide a media slot for downloaded upgrades. You must order an install the factory updated CTRL board located between the power and the Y sustain boards.