dim laptop screen

Hi,

I have a laptop that, at first, was having horizontal lines across the screen.  So I replaced the screen.  the new one doesn't have lines on the screen, BUT now the screen is very very dim.  To the point that you can hardly tell it's on.  So I replaced the motherboard, same problem.  So I replaced the inverter, same problem.  I've run out of ideas here.  Do you have any?

Thanks!
MalamamotoAsked:
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Randy DownsOWNERCommented:
Sounds like a backlight problem. Maybe this will help

http://ask.metafilter.com/92210/Backlight-or-Inverter-How-can-you-tell

Generally, when a laptop's LCD screen is functioning but extremely dim to the point of not really being able to see, this means that either the Backlight or the Inverter for the Backlight needs to be replaced.
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MalamamotoAuthor Commented:
So I replaced the inverter, same problem.
- malamamoto
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pjamCommented:
Forgive me if this is stupid, but you have it plugged into an outlet right.  All notebooks are DIM on batteries to conserve the battery.
Windows what?? Adjust brightness?
Model to avoid for others?
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MalamamotoAuthor Commented:
yes, it's plugged into an outlet.  and I did try and adjust the brightness via keyboard dim settings.

this happens before windows loads.  But it's Windows 7 Home Premium
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pjamCommented:
Thanks for the update.
Have you checked the manufactures web site for newer video drivers?
Or for known issues?
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MalamamotoAuthor Commented:
No I haven't, but this completely seems to be a hardware related issue because it happens in POST mode as well.
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Giovanni HewardCommented:
Perhaps the replacement screen was bought used?  It's possible you purchased a defective or EOL replacement screen, given all the other components you've identified have been replaced.  Do you have another screen you can swap?

I infer by your comments that the video card is integrated into the motherboard?  If not, have you tried a replacement video card?  If dimming wasn't an issue prior to replacement of the screen (only lines as you say) this would generally indicate all other components were OK (with regard to dimming) and that it's the replacement screen with the issue.
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nobusCommented:
did you test with an external monitor?
that will show if the video card is ok
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MalamamotoAuthor Commented:
Yes, tried with external monitor and it's fine from there.
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MalamamotoAuthor Commented:
I actually tried two different lcd's screens and they're both doing the same thing.
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nobusCommented:
are the new screens the original ones?  or "compatible"?  that can be the cause
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MalamamotoAuthor Commented:
I think they're "compatible" ones.  I can't speak for the old screen, but the new one is not OEM.
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nobusCommented:
that is likely the problem  - not "fully" compatible.
i assume you don't have a 2nd identical laptop around to test it? (or test with the working one)
then i would return both
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MalamamotoAuthor Commented:
bad replacement monitor was the issue.
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nobusCommented:
tx for feedback
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