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The capacitors on your backlight inverter(s) are bad or going bad. They will be bulged at the top and probably leaking electrolyte. You can replace the 4 capacitors for $1.59 each at RadioShack or buy new backlight inverter board(s). Have a good day and i hope this helped.
First, check the power supply for the backlight. It's usually a 24 volt supply. Look for swollen caps. If that is ok, go to the inverter board and inspect for damage, ohm out the inverter transformers. Last is to test out the lamps seperately with an external inverter. If a lamp goes out this way, it is bad and causing the whole backlight to go out.
Suggest you press the Fn key And the key to increase brightness, first. (Should be a key that has a sun icon on it)
Barring this does not increase the visibility of your LCD screen, the I suggest the Backlight is bad, or the Inverter.
The Backlight is a type of CCFL tube (Cold Cathode Fluorescent Lamp) mounted to the LCD screen. The LCD screen needs the light given off of the Backlight.
Replacing the Backlight is a daunting task, and if done wrong, will cause possible damage to the LCD screen.
The LCD screen itself has a thin metal frame holding the components of the LCD screen together. This frame must usually be opened on the side that has the backlight, to access the backlight. The components that make up an LCD screen are fragile, and can easily be damaged.
The Inverter supplies power to the LCD screen, as well as the Backlight. Inverters do go bad, but commonly it's the Backlight to go first.
This shows a typical Backlight replacement. It IS not an advertisement to attempt this yourself, but a reference tool for information.
Yes this is a back-light problem. The fault could be the inverter board which supplies high voltage to the CCFLlamp or it could be a faulty CCFL lamp, this lamp is a mini fluro tube.
For service, parts and DIY info check out LCD Parts - click on this link to their WEB site : - www.lcdparts.net
On the main menu (Start-- Win Logo) go to settings. Then go to system at the bottom of the screen. Tap on Power. At the very bottom of the screen in small print go to "Adjust Backlight settings to conserve power". Click on "backlight" in blue print.
I KNOW ABOUT BACKLIGHT.1st select mene option and go to setting.After go to display setting and go to backlight option and open it, on the backlight or set the time of backlight.
This is probably caused by a bad "inverter" board inside the screen housing.Don't worry they are relatively inexpensive and easy to replace.
However, some laptops have a failure on the motherboard which causes the backlight to go out,because the inverter,which powers/controls the backlight,depends on power and a PWM signal from the motherboard.
Backlight problems are almost never caused by the backlight itself.
change the settings for the backlight.. just go to
start>Settings>System>Backlight and use the tab to go to next
page and there will be the setting for the backlight while on charge.
Just move it up to desired lighting and there your done.
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