A1278 MacBook Pro dim picture, bad screen?

Hello everyone,
Got a MacBook unibody with very dim picture. This happened after a very minor liquid spill which I cleaned out. Bought a used screen plus a new screen cable from eBay and it's doing the samething. I'm about to buy a new LED screen thinking it can't be anything else since external monitor shows up without any problems or could it be the logic board even though I'm getting picture externally?

look for the app "Shade Control" in the App Store.
I think it is exactly what you are looking for.

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    http://support.apple.com/kb/HT1455
    http://support.apple.com/kb/ht3964
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    http://support.apple.com/kb/ht1379
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