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A lot of people don't realize that backlight settings can affect the picture.
Go to the menu (press menu on your remote)
The menu will show picture options. Just toy with different settings until you find what you want. It may be on a preset setting that doesn't work. If you are in a bright room, you will need to increase brightness and contrast and perhaps backlight.
Usually an unclear picture is due to the contrast, backlight, and brightness settings being too low. You can also increase sharpness.
I suggest a contrast setting of 70, a brightness setting of 60-80, and a backlight setting of above 80.
Brightness can be adjusted by the hotkeys or within windows (system settings - backlight). contrast can be adjusted with a potentiometer at the mainboard. normally contrast does not change over the lifetime (my oldest 3090 is used 8h/day for 7 years)
some of the old 3090 have a CCFL backlight which dramatically losing brightness when getting old. you have to replace the tube or display unit.
Hello Check whether the backlights get full brightness as you increase the bright ness level. Set the set to least contrast level, and check whether the backlight is sorking well. If it is OK, then try to increase the contrast level [to at least 70% of the total]. If backlight level cannot be adjusted according to the contrast level the backlight inverter baord and backlight CCFL lamps need to be checked. images of the backlight inverter board and CCFL lamps are attached here.
Read your manual about a contrast control for the display. At one end of the range of control the display is almost invisible. Sometimes there is a little shaft/knob on the back, other times it is a menu item and yes, it is hard to see the display to adjust the display... just go through the procedure blindly to see if it comes back. Also illuminate the display if dark with a flashlight and see if there are display characters there but just lacking a backlight. A backlight failure could be the problem.
First things is check the picture adjustment.Try to adjust the brightness and contrast.If did not work the problem is the backlights of the LCD. Usually in that case the problem is loose connection in the backlights connector. The backlights have high voltage so it may cause of overheat at the connector.So try to check the connection of the backlights at the board of your television.Remove the back cover of the TV and look the conector of the backlights and try to resolder and fix it.
Reading your user manual on page 12, bullet 9 you will find the method of changing the contrast of the display. There is no brightness adjustment possible, however the contrast DRASTICALLY affects the readability of the display.
You can adjust the LCD contrast by pressing the Utility button and turning the dial one way or the other. Pressing the Utility button toggles back and forth between LCD contrast and Compressor/Limiter Threshold Meters, so since you can't see anything in the window you may have to press Utility twice, though I think LCD contrast is the first option.
if the picture is REALLY dark, like you can just barely see it in a lit room, then the backlight might not be lit. LCD TVshave backlight that shines through the LCD screen which allows you to see the picture.
If it's not the backlight then it would be the brightness/contrast settings that need to be adjusted. If the picture used to be normal and all of a sudden went dark, verify the backlight. Normally you can look through the slots on the top of the set and determine if the backlight is on. If you can see a bright light through any of the slots, the backlight is probably OK... go after the brightness/contrast settings.