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Re: LCD screen blank out
Look at your function keys (F4 F7) from what i can see on the picture but it will somehow resemble an lcd screen. Try to push the Fn button along with the F-button that has the "lcd" picture at the same time. If this does not work pushing it once try to push it twice. After each time release both buttons and wait a couple seconds after each attempt and see if this fixes the problem
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If your Laptop is working on a external monitor and the Laptops screen has gone blank, this will indicate a fault with the LCD or the inverter (the little chip responsible for providing more power to the LCD)
You may have a defective CCFL backlight, it may have the following symptom: Screen flashes on and off or displays reddish pink hue. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickers on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replace the CCFL lamp. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight. It could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out, this is the most likely case. The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills. Check out LCD Parts for service, parts, and DIY info Use this link to their WEB site :- www.lcdparts.net
It could be either, if you can get another LCD screen (same make/model) you can swap to ckeck it out.
You could check the inverter by touching its output and if you get a bit of an electrical shock then you know the inverter is working or check it with a multimeter if you don't like electric shocks.
sounds like you have a loose connection ....either into the screen or into the motherboard....the connection between board and screen runs through the hinge brackets and often comes loose after machine has been opened and closed a lot.....need to be comfortable opening up laptops to check the cables as it can be tricky to get to the back of the screen where the end of the ribbon cable is..