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try using a cleaner called goo-gone, it disolves a multitude of different oil and wax based staind and marks I use it to remove gum from a dark green couch and then a white carpet. Both stains are gone no residue, it has a citrus smell that fades with regular soap and water after te stain is gone.
The problem actually is from a lamp in the unit, it is getting damaged gradually that is why it is two third of the screen that has gone dark. once it gets completely damaged, the entire screen will turn dark.
Try to ***** the lamp of the television and replace it with a new one.
After doing that your television will be in good condition once again.
I assume that you can at least see the display like texts or images on the screen even if it's dark. There four things which can cause this, first the display cable (flex cable), second the display connectors on the display or on the board of the mobile/phone,third is display ic and the fourth is the display itself.
To troubleshoot this, it's a must to open apart the set, you'll need appropriate screw drivers and spares like display and flex cable.
Open the case, disconnect the terminals of the display flex cable from both the display and from the board, do some cleaning with alcohol/spirit/ipa solution with a soft brush, and again reconnect them after it's dried. If this isn't successful, go to next step.
Next replace another cable (display) and check if you can see the light on the screen or not. Again there's no light? Next step...
Connect the other display (should be a working display of the same model and type). If the problem goes, then your solution is replacing the display. If not the display ic which only professionals and trained technicians can handle.
Hope this helps.
Is this a brand new computer? Was it displaying properly before and just suddenly started showing up dark?
Most laptop monitors have a brightness control. It is possible that yours may have been inadvertently turned all the way down (it can happen accidentally). It is usually accessed by a function selector on the lower left side of the keyboard in conjunction with a function key, like F7, F8, F9, etc... you should check your manual first to be sure.
If that doesn't help, then it is possible the backlight for the LCD screen has gone dead. Those can be replaced by authorized service centers.
does the fan work ok? and do you have a laptop holder for it or you just have it on a desk ....get a laptop holder for it if you do not have one and as for the rest goto the power mangment area on the computer and see if the monitor might be on stand by after a few min ...