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Re: dark picture image, dosen't respond to briteness...
Are you able to see the picture in a dark room ? does it appear bright enough then ? if so the lights behind your screen have dimmed or gone out completely. this may just be the power supply for the lights or your lcd panel may need to be replaced
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Looks like the back lights are not working. The older TV sets had fluorescent tubes, the newer have LED's voor back lighting. I would look there, or visit a repair shop. Or when the TV is old, start saving up for a new one.
If its LCD get the room very very dark and turn on--with a flashlight near the screen look closely at the screen to see if you see a very faint image of the picture or not---Most LCD flatscreen's (not Plasma) use what is called a back light to light the screen--light source.
If a faint picture can be seen that way the light is not on.
I would first take a look at the screen with set on in a very dark room with a flashlight---do you see a very faint image or picture? That would indicate a back light issue-----Good luck getting a board, I hear the company is again out of business.
The set may have an ambient light detector - if so then the set up options will allow you to vary the screen brightness - a simple check to find out if this could be the problem would be to display an image during the day then if possible close the blinda and make the room dark - alternatviley do the same at night then switch the room lights on and off and see if the brightness changes.
This is called a dark shading error. All the LCD consumer sets have some visible degree of this effect. Some will be a little less or more than others even from the same batch in the assembly run. This has to do with the optical design quality of how the back-plane lamps illuminate the screen. The design and assembly tollerance of this area is very critical.
Normally, LCD screens don't show their best picture in a darkened room. The very black regions of the picture content may look a little washed out. LCD screens are best watched in a room that is lit, but not very bright. You have to consider that there is a powerful set of lights behind the polarized panel of the LCD display, and there will always be some breakthrough of light.
If you want a TV that is more like a CRT in its characteristics a Plasma would have been a good choice. The trade-off with the Plasma is that it does not have the picture sharpness of the LCD. A Plasma set is best watched in a darkened room.
If you have an LCD computer monitor, take a look at it in a dark room with a black screen. You will most likely see the dark shading errors. Only the very expensive production studio type LCD monitors have less of this error than the consumer sets, and they are not absolutely perfect.