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Hello! My system model is hp pavalion dv4 series no is 1216tu.I am unable to see anything on the screen.so can u suggest me what is the problem for this??

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There are several possibilities. Can you connect an external monitor to the laptop to check the video signal. Then press Control-Alt-F1 to send the display to the monitor. Check your documentation for the hot-key to enable an external monitor if the sequence doesn't work. (Otherwise, you need to get into Windows to change the display settings.)

If the external monitor works:

1) The screen is dim (backlight or the backlight inverter failed). To check this look very closely at the screen and see if there is any image. Sometimes holding a flashlight near the screen will help you see this. If you see the image, then the backlight is the probable failure. If there is no image, the inverter or the video cable are suspects. The inverter can be replaced fairly easily and can be tested with either a multimeter (that reads high Hz values) or an oscilloscope after removing the bezel from around the laptop. Hold the probes a fraction of an inch apart about an inch above the inverter. With a multimeter, you should see a value of either 1 (above the range that can be interpreted), a value (say 50,000 Hz). If it isn't working, you will see a 0. The backlights can also be replaced but is harder.

2) The video cable from the motherboard to the screen has been damaged by opening and closing the laptop. This can be replaced.

If an external monitor doesn't work, then I suspect your on-board video has failed or has a problem (assuming the laptop appears to have booted at all). First reset the computer. Unplug all of your peripherals. Then remove the battery (and power adapter) from the laptop. Then press and hold the power button for at least 15 seconds. Reconnect the power adapter(not the battery) and see if any of the keyboard and activity lights come on.

You can try getting into the BIOS to check. Turn off the computer then turn it back on while pressing and release F10. If you can see the BIOS information on the laptop's screen, it's a Windows issue. Try pressing F8 in a similar fashion. In the Safe Mode, try uninstalling the video drivers or reverting to last known good configuration. Alternatively, insert your recovery disc or Windows Install disc and press F9 to select boot location. Try to do a system recovery. (Alternatively, press F11 and do a system recovery to the original condition of the laptop.)

I hope this helps.

Cindy Wells

Posted on Apr 04, 2011

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