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No backlight and bad battery after water spill

Had a water spill on the laptop. I opened it and dried it out really well. However, some damage:

1) Battery is bad

2) Display backlight is not working

The laptop works fine when I have it plugged in and mirrored to an external monitor. As soon as I unplug, it shuts off.

I can replace the battery, but any idea what could be causing the backlight issue? Or anything that could cause both battery and backlight from a liquid spill?

It's not in warranty and Apple said they would fix it for $700, which is not worth it. I'd like to fix it myself.

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You need to dissasemble your macbook and use 99% alchol and a tooth brush (perferably new) and scrub everything dont be afraid to pour the alchol on the board just don soak it ! once youve applied it scrub scrub scrub then i would let it dry for 24 hrs. then if the backlight is still messed up you would need a new back light fuse put on bascially . and if you need a fuse your gonna have to get a new one off ebay or something for your specific model then solder it back on to the board but i would say before you do any of this send it to a professional most rates are $325 and they have actual machines instead of toothbrushes and such! BUT ITS POSSIBLE! You basically wanna get all corrosion off the board! Then Start diagnosing from there and start replacing the parts to make it work again!

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Where does one buy 99% alcohol? Isn't cleaning alcohol found in stores only 70%?

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