Powers On but No functions after Battery Replacement

A Friend and I replaced the Battery in My Macbook since it recently gone bad and started swelling up.

The last time I turned on the macbook with the old battery, the keyboard was seemingly functional (based on the caps lock key light working), but the display would not come on, the touchbar would not display anything. I never tried if the sound worked. The bottom was very hot to the touch.

Now, with the new battery installed, the computer powers on (with it open, we can see the fans spinning, and the CPU gets hot) and it seemingly activates the trackpad too (as its clickable). But nothing else works. No display, no touchbar display, no keyboard. Although the touchbar doesn’t work (I would guess the fingerprint sensor doesn’t either), the power button does work completely fine. Not sure if the IFIXIT Battery comes with power in it (lol) but seemingly the thunderbolt/usbc ports work as the charger did. The bottom gets a little warm as it might normally.

Anyone have any ideas as to what the issue could be here? We did use the “remove the logicboard” method (only afterwards I found out you could change the battery without removing it), so maybe something was damaged or misplaced, but we were sure to review the reinstallation to see if anything was out of the ordinary. I’ll include photos of the logicboard in case anyone sees something that we might’ve glossed over.

Thanks in Advance!

Images : https://imgur.com/a/JIJb9kJ