MacBook Pro won't power up and no charger light after USB device was plugged in

Hey guys,
I have a late 2012 MacBook Pro 13" with a water damage that didn't cause any troubles (until now).
A couple of days ago I plugged in a Samsung tablet to recharge it's battery on my MacBook. At the same time my screen went black and the MacBook powered off. No usual forced low-battery-shutdown or anything, it just died. From then on the charger light didn't work and I wasn't able to start the Computer anymore. From time to time the charger light was flickering a little bit but way darker than the usual luminosity. The Laptop had a water damage about a year ago, which didn't cause any trouble. I dried and aired it for a couple of days and didn't switch it on during that time. It worked normal for the rest of the year but now I think the mainboard is ******. Please tell me something different, or the truth even though it might be shattering.
Just in case it might be important. I was backpacking in Sri Lanka when the incident took place. It didn't seem like there was an overvoltage or anything like that though...
Thank you guys and have a good day.
Alex

Liquid damage is progressive.
Best action that can be done is to take the computer to the Apple store to have it checked out
and repaired if possible and affordable.
Best.

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