No Display and No Startup sound

I have a water damaged MacBook pro, I removed the logic board and cleaned all the connectors and the logic board itself using isopropyl alcohol. Once I put it all back together, there device still hasn't started up.

After I tried the previous way, I replaced the logic board with from another MacBook but this time there was a start-up sound and the keyboard lit up. however there was no picture on the display. Also tried putting a HDMI cable and connecting to a tv but still no luck.

Also the area in which there was water damage now has 3 sticky keys.

Any help would be appreciated.

Thanks

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