Verified backlight is working, but there is nothing to be seen on the screen. A external monitor works, however. I've tried re-seating the cable between the video card and LCD, re-seating the video card, and have checked continuity of all wires of the cable between the video card and LCD. Do you think its the video card or the LCD?
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Hook your laptop to an external monitor and see if the screen comes on...if it does then your lcd screen is faulty and needs replacment. If it does not come on then re-download your video driver/s. If that does not work. Maybe your lcd inverter or backlight bulb is faulty and needs replacement. Please take time to rate me thumbs up
Since an external monitor works, it is the display's backlight or inverter board.
If you were experiencing discoloration in the screen (pinkish lower light hues) before it failed, that would indicate a CCFL backlight issue. If the screen suddenly went dim on you rather than a slow degradation the inverter would be indicated.
In either case, a technician in your area should be able to help. Evalaute to see if the repair is cost-effective.
You need to replace both the parts here... The backlight is the main problem... But its advisable if you can replace the LCD inverter as well.. Replace them.. Since the display is working on the external monitor the problem will be fixed...
Try using an external monitor. If it works with this, the display board may be out. If you can see the faint image shining a flashlight diagonally at the screen, the backlight is burned out. It should be practical to replace the display if it's still a good computer otherwise.
First of all, check that the laptop is set to output video to the LCD. There should be a function key which will determine whether it is outputting video to the built-in LCD, the external monitor, or both. That should be holding down your "FN" key and hitting "F8." If it is on CRT ONLY, it should switch within 1-2 keypresses.
Secondly, take a good bright flashlight and shine it directly at the LCD panel from about 1-2 inches away. If you can actually see the graphics on the screen faintly in the background, your backlight is not turning on. The backlight is literally a bulb which lights up the screen, and they can burn out. It is repairable, and shouldn't cost more than $150.00 from a reputable repair shop.
Its possible that the LED light that illuminates the screen is dead. If you look very closely can you make out any information on the screen or is it absolutely black? If you can see text or Windows, then its likely the backlight.
If you cant, try plugging an external monitor in to see if it is even booting. Also look at the HDD light (bottom right of the keyboard) to see if it flickers on and off while starting. If there are no lights, then you may have a dead unit... Get er fixed.
Yes, this is a backlight problem. However, it could be either the light itself or the inverter that powers the backlight when it fails like this. I'd recommend replacing the entire screen plus housing and hinges (it is often sold as a complete unit) or just replace the inverter (often relatively cheap) and then if that doesn't fix it replace the screen (the backlight is non-replaceably attached to the screen).
The other option is to simply attach it to an external monitor and use it like that. This is also a free way (well, as long as you know someone that has a monitor) to make absolutely sure that the problem is the screen and not anything else.