I have a Dell Inspirion E1505 and the screen keeps going dark. I hear a subtle high pitch and then the screen blacks-out. The page is still active, however the screen is black. When I close the computer & open it back up sometimes the screen comes back on and I can resume my activity, however then it soon goes back to black.
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The back light is the whole of the screen, the screen is illuminated by a CCFL lamp (fluro tube) on the bottom of the screen. A inverter supplies high voltage to this CCFL lamp. If
your laptop appears to boot up and the hard disk LED flashes, then the
problem is probably a back light fault. This can be a faulty inverter or a
faulty CCFL lamp. Please click on this link and follow my instructions
to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
Check the box that says Activate Presentation Mode
But I don't think that will make your screen brighter, if its still dark then look for the function hot key to turn up the brightness on your screen. Its usually something like - hold the "fn" key and press the up arrow several times.
The high pitch sound is most likely a faulty inverter.
Most defective screen are caused by a defective inverter or a CCFL lamp or simply the video cable needs reseating. After reseating the video cable and the problem is still there then :- To determine if you have a LCD screen or video card problem, read this and follow the instructions. Defective CCFL backlight, it may have the following symptom: Screen flashs on red/pink and off. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickering 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 replacing the CCFL lamp Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case. The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills. Check out www.lcdparts.net for parts, repair service and DIY info.
First Run a diags on the dell laptop. You can initiate it by pressing fn+power button together and start the laptop. It will go to the diags screen. Tell me if the diags pass or not and then we will troubleshoot further. Thank you Rakesh Dell Laptop Expert