Chosen Solution
I’m considering purchasing a liquid damaged Macbook. Judging by the pictures and seller description the logic board doesn’t seem to be affected by the spill. Is it possible that the logic board itself is fine, but the power button on keyboard does not work? I want to make it my first laptop I get back working myself. I’ve watched tutorials on how to replace the keyboard and I think I can follow them, but troubleshooting the logic board might be too much for me right now.
It can be a keyboard may be fault is with keyboard, but i suggest you to go through a regular diagnosis which will help you to find the possible issue to fix your device.