Changed out the EFI chip on this MacBook Air and now it won't power on
I recently bought an Apple MacBook Air, and stupidly didn't check to see if there was a firmware password on it or not. The old owner doesn't know the password. So, I purchased a pre-loaded EFI chip for this specific model (a1466 EMC2632) and followed a tutorial on youtube on how to replace the EFI chip with a heat gun and flux. I did so, and I reassembled the logic board and doubled checked to make sure every cable was plugged in properly. I plugged in my MagSafe charger and it doesn't show a green light. I pressed the power button and nothing came on, no sound, no battery symbol.
I thought maybe the BIOS chip was bad, but would that prevent the entire computer from powering on? The battery is still good, the cables are all plugged in securely. I don't know what exactly could be causing this, as I didn't do anything other than heat up the EFI chip and replace it with a different one (which is from the same model MacBook Air). I know the charger works properly because it charges my MacBook Pro just fine.
any suggestions? Is there something that could go wrong in re-mounting the logic board?