Sony Viao VPS-C111FM Model LED screen barely can see not bright

I have a Sony Viao VPS-C111FM Model Laptop with LED Screen.  When turned on you can barely screen.  In LCD screen I know either the inverter is bad or back light is bad.  What could be wrong with the LED screen now.  Is the cable that connects the motherboard is bad.  Is there any setting in BIOS that says only work with external screen? a
QCR_SolutionsAsked:
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nobusbiljart fanCommented:
there is not much to find, but the ones i found talked about a bad motherboard
you can always test if it does the same when booted from a live Knoppix cd : ftp://ftp.kernel.org/pub/dist/knoppix/KNOPPIX_V6.4.4CD-2011-01-30-EN.iso
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Reece DoddsCommented:
Invertor board is relatively cheap ($20-60) and somewhat easy to replace.  May be difficult to find for a Sony though.  I would start there...
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QCR_SolutionsAuthor Commented:
This is the LED screen.  Only LCD screen has inverter.
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nobusbiljart fanCommented:
does it work ok on an external screen?  then it can be the video connector - reseat it to test
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QCR_SolutionsAuthor Commented:
Hi, I have reseated it 3 times.  I even tried it with two good screen.s
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nobusbiljart fanCommented:
does it work on an external one? or not?
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QCR_SolutionsAuthor Commented:
Yes it works on external.  
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QCR_SolutionsAuthor Commented:
Hi, Thanks for all your help. I came to conclusion it is the the bad motherboard.  
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nobusbiljart fanCommented:
was that not suggested by me?
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QCR_SolutionsAuthor Commented:
Hi, Thanks for your help . Enjoy the points.
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nobusbiljart fanCommented:
fine - tx
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