Wont turn on after randomly turning off

Ive bought a macbook air A1466, used to have a macos device for messing with my older iphones.
Ive been using it for a month and a half and when i turned it on last morning it booted up, i entered my user password and went away. when i came back it was on the desktop and it randomly went blackscreen.
I thought it just fell asleep but pressing keys and touchpad nothing happened -it wont turn on anymore, no chime, no fan, nothing. I tried pram reset(but no apple logo when booting so didnt really work..), smc reset multiple times.
Unplugged battery, also took it mostly apart, put everything back, checked connectors.
Only issue is that the bluetooth-airport card's one of the connector wont go on, but that has been like that since i bought it and it worked. Also the screen has dark spots and light spots -probably liquid damage(some extra info). But liquid indicators arent red on the board or anywhere... but theyre yellow-ish..??
Also battery health was like 39% (in coconut battery), but as i said it worked completely fine before, and unplugging the battery from the board still didnt work. Magsafe charger is orange, but after a bit turns green.

What can i do to make the machine work again?