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DV7 display problem,

Last response: in Laptop Tech Support
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December 19, 2011 3:11:31 AM

I have a HP DV7 (which I replaced its cracked screen), but now, when I turn the computer on the display lights on, but nothing shown on the screen.
I can work with external display with no problems at all!
I replaced 2 different flat cables
and 3 different panels
weird thing is that if I disconnect and reconnect the display cable (while the computer is on) suddenly the screen shows display, but it's distorted (green lines)

Shot at 2011-12-18

Shot at 2011-12-18

Any help would be appreciated!

More about : dv7 display problem

December 19, 2011 1:45:36 PM

Replace the backlight?
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December 19, 2011 1:59:33 PM

the backlight is fine.
I turn the computer on - no display but light is on
disconnecting the display flat cable then reconnecting it- weird green lined display shown (the computer is still on during this process)
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December 19, 2011 3:35:03 PM

have you checked the MB connection to the video output? It does seem there is a bad/loose connection somewhere.
considered the possibility that the video card is bad?
considered the possibility that the replacement may be faulty, also?

Personally I don't believe that making/undoing connections while under power is a very good process, but it's your machine :) 
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December 19, 2011 7:35:11 PM

I agree, not a good idea to plug the screen while the computer is on, but I had to try and see any change.
regards the video card, as mentioned: external display works perfectly.
I will try another flat cable and another screen before I decide the MB is faulty.
thx for the support!
Zack
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December 19, 2011 8:19:23 PM

Hi, just would like to say that I have encountered this problem on many IBM t41 series laptops, they output fine to VGA/svideo but LCD doesn't display or is red/green/magenta. In my case it was the on-board Graphics Chip needed to be "reflowed" to re-solder the connection. This worked on maybe a third (but I don't have pro gear, just a heat gun and some foil).

The HP-DV4 had MANY issues like this that might be worth searching out, Good luck!!
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December 20, 2011 12:30:54 AM

appreciate everybody's help in the forum!
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December 21, 2011 7:56:21 PM

Got a heat gun from a friend, will try in the next few days, will let you guys know....
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December 23, 2011 3:39:33 AM

Ok, tried the heatgun today with no luck.
I believe it is the motherboard, but could also be the connector between the MB and the flat cable .
Peace
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!