I'm working on two A1278 Macbook Pro Logic Boards with the same exact issues. They both had water damage, cleaned up both boards in alcohol, they power up, battery is charging, fan is on full, the HD spins up but the white LED indicator in the front of the case just stays solid in the front. No Chime, blank screen. I'm guessing the SMC circuit has sense a failed self test so it won't allow the unit to boot up. Can anyone, hopefully cmdrdata or Dadioh or any of the other super knowledgeable guys on here point me in the right direction? I have schematics for both the 13" and 15" Macbook Pros but have no idea where to start looking..... Any help would be super appreciated!