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Re: Black LCD Monitor Dell Inspiron 8600
Since the external monitor displays and dim image on the laptop's LCD screen then the fault is the LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is 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.
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for your video problem, you may be stuck in a different mode try holding the Fn key and hit F8 this toggles through the modes 1 - LCD on laptop only 2 - LCD and external Monitor 3 - External monitor Only
if this does not work you may have a LCD issue with the laptop .. let me know how it goes first
If the monitor remains black when you try to reboot, the CCFL (backlight) in the monitor has probably failed. If your look at the monitor from a sideways angle, you may be able to make out some graphics when the computer is on. If this is the case, you need to replace the CCFL or the whole LCD assembly. If you are uncertain, you should check the ribbon connectors going from the main case to the screen. If you get different results when on AC power, this could be a shorted battery or a bad power supply board. If your laptop has an output for an external monitor, you could use this to determine if the problem is with the monitor only, or with the graphics card and/or motherboard.
The invertor lamp has gone bad, so you would need to replace the LCD screen. there is nothing else you can do. try to connect an external monitor adn then press Fn + F8 to switch the video to the external monitor. if the image on the external monitor is fine then its the lcd. if the external monitor has the same image then motherboard problem. you can also try Fn + Up arrow key to increase the brightness.
If your video output works fine when connected to an external monitor, then the issue is with the LCD display panel. I’m afraid the only way to fix this is to have the LCD panel replaced. Your responses are intended to improve the level of service provided. Please rate your experience. Thank You.