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HP laptop has no video

Posted on 2010-08-30
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Last Modified: 2012-05-10
Customer has a two year old HP Pavilion laptop running Vista, and reported that they could no longer see anything on the screen.  During testing, I CAN see the backlight come on while it's up and running, and the backlight turns off when Vista shuts down, but I never see any video at all.  However, if I have an external monitor connected, I see everything like normal.

I can't see anything in the BIOS that would affect this, and I'm assuming that an incorrect function key setting would surely not keep it from showing any video at all, such as during boot up.

HP wants $50 just to talk to me.  I'm assuming this is a hopeless case, short of having the customer spend megabucks on a repair.  So, before spending money with HP, I'm hoping to get some guidance here on a likely cause and/or approx. costs to repair--and whether that's even worth doing.  TIA
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Question by:sasllc
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Jerry Miller earned 100 total points
ID: 33564568
You don't even get the POST messages during boot?  It sounds like either the contrast or brightness is not functioning normally. Verify the neither one is set all the way down to the darkest setting.

If you get the POST messages but nothing in Vista, verify that the resolution setting is supported for the video driver. Since you can connect an external monitor, you can see the resolution settings and make appropriate changes.

One hardware thing that you can check. Most laptop screens have an inverter board that connects the LCD to the mother board. Here is a way to verify that the inverter is good. This will narrow it down to the LCD itself. But I think that the inverter is probably your culprit.

http://www.fonerbooks.com/test.htm
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by:nobus
nobus earned 100 total points
ID: 33564725
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by:web_tracker
web_tracker earned 100 total points
ID: 33564889
This sounds like a typical backlight problem, especially if  your system works fine using an external monitor. When the OS boots up, try shining a flash light on the lcd screen to see if you can see any video, if you can then it is definitely a backlight problem. This part is usually quite cheap and fairly easy to replace. You would not have to replace the lcd screen. If it does not seem to be a backlight problem then it could be a bad signal cable going to the lcd screen or the lcd screen itself.
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by:edbedb
edbedb earned 100 total points
ID: 33565583
Replacing the LCD screen will fix the problem. If you shop around you should be able to get it repaired for $150 or less.
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by:nobus
ID: 33566009
you can also test with an external monitor !
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by:Grant1842
Grant1842 earned 100 total points
ID: 33568175
Here is some info that I wrote it may help you.
http://www.experts-exchange.com/Hardware/Laptops_Notebooks/A_3546.html
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