MBP not turning on... pls help

Hello guys, I`m trying to repair this laptop, long story short, he get humidity for a few days, 3 days after that, I try to turn it on, he turn on, but the display did not. I did open it just to note that the charger was always green as well. I noted that the logic board did have a rusty part, small, like 1 inch, near from the power connector, but not on it. I clean it with a brush. After 7 hours... it works, he chimed, the display turn on... PERFECT!

BUT... then I turn it off again to close it, but he did not turn on after that! Please help me out to solve this! Sorry my bad english. Thank you in advanced!

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what's your battery indicator light is the battery dead , what i'm getting at is your dc jack may not be up to par and don't plug it to turn it on it's charged , your trying to eliminate the jack causing a problem it may be stopping short.

The DC jack looks perfect, there is some way to test it? like a multimeter or something like this?

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