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My Hp pavillion dv2120us laptop intermittenly shows a black screen when resuming from shut down or stand by, yet all buttons and keys still light up.

Posted on 2008-10-21
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Last Modified: 2013-12-11
My Hp pavillion dv2120us laptop intermittenly shows a black screen when resuming from shut down or stand by, yet all buttons and keys still light up.  Periodically when I repeatedly insert the AC adapter power supply upon start up the screen will light up and will work normally until I shut down or stand by again.  I have tried flashing the bios, reconfiguring the power mgmnt, updating drivers, and even resetting OS to factory settings, all to no avail, please help.
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Question by:willturnbow
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7 Comments
 
LVL 31

Expert Comment

by:rid
ID: 22780984
If this happens at power-on and resume both and randomly at that, I'd be inclined to suspect a bad backlightning system. The CCFL tube(s) or the inverter may be going bad. It could possibly be something with the lid switch, but that may be depending on what action is activated in power management for "close lid". If the unit boots up or comes out of stand-by properly except for the screen, it's not a typical lid-switch-scenario.

Can you see a faint version of the desktop on the screen if you shine a light on the screen? If so it's definitely the backlighting. If the screen is totally blank, you may have to consider a cable or LCD screen problem.
/RID
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Author Comment

by:willturnbow
ID: 22781571
The flashlight trick showed nothing.  So if it is not a backlighting problem it is a cable of lcd problem?  So if it works perfectly sometimes, like now as I am writing this comment, is it not the lcd but instead a loose cable?  So it is hardware and not software? So that I have to take it to a repair shop?
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rid earned 500 total points
ID: 22783176
Sounds like hardware and it sounds like the cable to me. If yo're not into laptop repair, you may what to take it to a shop. The irregularity may be due to intermittently bad contact somewhere, in the cable or its connectors at the mobo or LCD end.
/RID
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Author Comment

by:willturnbow
ID: 22791187
Thank you for your feedback.  I am always up for a computer challenge but I definitely do not want to ruin the laptop.  Do you know of a good website that will help me repair the connection? Thanks again
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