Question about HP Pavilion DV9920US Laptop

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My screen went bad and i have tried the invertor and other things, no one can tell me the problem.

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Please follow the diagnosis outlined in this article to check whether the backlight lamp or the inverter board are the root cause of the problem or not:
http://www.fixya.com/support/r6430776-troubleshooting_laptop_power_failures

If you connect the external monitor & nothing is displayed on it, then this means that both the backlight lamp & the inverter board are fine.

Posted on Nov 11, 2010

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You should have checked the power voltage rating before using another power cable.

The computer memory or processor must have gone bad.

Check the power rating before connecting another inverter.

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all displays, fail. all do. no reason to get angry,
a broken display is worth nearly zero value $0
so how much money will you spend on worthless.?
you can get a new display at Walmart for $65, ,
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a bad inverter (< it's power supply) is for the back ground lamps. not data side. the data side is failing and is common, if you twist the screen
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Sounds like you have a faulty capacitor on your invertor..Gently press on the screen when there is no picture.is there light on the screen? If so, there is backlight but no video..hence a mainboard or power supply problem..If there is no backlight then the problem is the invertors or the power supply not supplying 24volts. The invertor is located on left or right hand side of screen..Check that all connections are secured and not loose.Check that the power supply capacitor tops on the power supply do not have bulging tops..If not, and voltage is reaching the invertor, then remove the invertor and check for bad solder joints and leaking capacitors.

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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.

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