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Sounds like screen voltage has exceeded much. Its LOT adjustments should be checked. Contact any service technician.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Try going into power option settings and taking the brightness to the max there. Start, control panel, power options, then you should see a setting for battery and for plugin. Hope this helps.
Hello
Adjust colour control to zero, and check for a pure black/white picture. Adjust contrast and brightness control to minimum and check whether the picture goes completly off or a slight picture prevails. If the picture goes out when you turn down brightness control to 1/3 position, that is about 20 points, your TVs screen voltage is very low, and it can be adjustable. If the picture does not go out and more brightness prevails, screen voltage is high. If the screen voltage is high, there will be some fine lines across the screen at about an inch apart; on the whole screen from top to bottom.
Screen voltage adjustment is critical for the clarity of the picture. If it is low, no proper colour will be dispayed. If it is high, it is harmful to both picture tube and your eyes.
Never try to adjust it without proper knowledge about it. The screen control can be located alongwith the LOT [Line Output Transformer], of your tv. There will have two adjustable controls there, one is for Focus, and the other is for Screen. Both are interactive, that is adjusting one will effect an other.
IF your backlight has not blown (screen will be very dark, hardly see anything on screen) then you adjust brightness in Control panel / power options.
You adjust the brightness for mains and battery power schemes here
Try going into the control panel and select power options see if there is way to adjust the display brightness or try holding down the "Fn" key and use F7 to increase the brightness
Now just play with the brightness settings until you get the desired effect.
Also, make sure you don't have the brightness settings too low for your off battery settings. This could be a reason as to why your having this issue. If this doesn't fix the problem, let me know.
How do I adjust my brightness or contrast on my laptop?
See our brightness definition for a visual example. Finally, most laptops only enable users to adjust their brightness of their screen.
Click on the above Link, Good Luck, Please dont for get to Vote.Thank you.
try to open your tv and you can find the flyback ,in flyback you can see the screen and focus to adjust.use and try to rotate the screen,it control the brightness of your unit
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