When I try to set the background light on bright, my lcd light just turns off competley. It looks as though my computer was turned off, but the computer is still running as a matter or a fact if you hold a flaslight on the side of the screen you can see. If any body can hel please let me know what to do. I don´t know if it is a bad inverter, or a bad screen light but it is really anoying because I can´t use my computer unless I keep the lcd light at the lowest.
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The following troubleshooting guidelines are basic troubleshooting steps.
It is recommended to charge the battery while the system is off for
faster charge times. Users may notice longer charge times when the
system is powered on and running graphics extensive applications.
If the system does not perform a Power On Self Test, there are various things to look for:
If the system has no power light, ensure that it is plugged into AC power. Remove the
If the system has power but is not performing a POST, check to see
if the keyboard status lights flash to indicate a successful POST, but
no video, or that the keyboard status lights are lit in a sequence
indicating a system problem.
With the power off and the system unplugged, remove all CRUs from the system and reconnect that AC adapter to
the system and try again.
Run the On Board Diagnostics (OBD).
If the LCD on the system shows no display, or has other LCD problems, there are some basic steps to take:
If the LCD is not displaying video or the video is garbled, run the BIST Test.
If the LCD is not displaying any video, connect an external monitor to eliminate a no POST problem. A good
image on the external monitor eliminates a video card problem or a POST problem.
Connect an external monitor when possible for all LCD related problems, to help eliminate
a software possibility or video card problem.
If the LCD has extremely dim video, attempt to adjust the brightness
or connect an AC adapter to eliminate a power management conservation setting set in the BIOS.
If the LCD has lines on the screen, check the system during POST as well as system setup to
verify if the lines are present in all modes of operation. Run the BIST Utility.
Try increasing the brightness of the system. Laptops have "Fn" combination buttons that allow you to use some shortcuts. Look for a button on the keyboard that usually looks like a sun or bright object with an arrow pointing up. Press and hold the "Fn" button down and press the designated button to increase brightness.
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.
Does the external monitor display a normal image?
If the images is OK then the video card is OK.
The inverter supplies high voltage to the CCFL lamp which provides the backlighing and does not jumble the colors on the screen. If you get a pinkish hue or a flashing screen then this would indicate
the CCFL lamp is faulty.
From the description of the fault, it indicates that the fault could be a faulty video cable or video connector. Try reseating the video cable/connector on the motherboard.
You need to replace the LCD inverter; it is the small board that the LCD monitor plugs into and the inverter plugs into the motherboard. Here's one for $10. Oh, and please take a moment to give this solution a fixya rating. Thanks! :c)
this sounds like a classic case of inverter problems, it could be just inverter coil thats gone which is an inexpensive repair, if it is the inverter then its a bit more. try the Fn the F key that shows two tv screen icons, it may just have switched to external mode by accident