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how about in the menu button you can not get an adjustment in brightness control. if the display in the screen is too dark either in any channel or even watching a movie from an input source like dvd player, then i may say that the picture tube need now replacement.
It sounds that lamp in TV is weak and not throwing enough light to bright the screen for good image. How old is this TV and did you replaced its Lamp recently? If lamp has not been replaced yet or in last 2-3 years, replace it.
you need to open your tv,s back cover then manually adjust the screen grid from the flyback transformer,note to adjust it slowly and be sure not to over adjust
I too have the same problem with the same monitor.. tv looks great OSD looks great.. pc is dim.. This has nothing to do with the inverter board or the backlight.. I believe that there is an issue with the components that render the Computer video.
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