|Here's a question for you. Where did you get the replacement motherboard?|
Was it new from Toshiba or second-hand from ebay?
Your bios password problem with the "new" motherboard has nothing to do with your botched soldering efforts on the old board.
I suspect you have a second-hand motherboard that had the bios password enabled by it's original owner Contact whoever sold you the motherboard and if they cannot provide the password demand your money back.
Goin' Fishin' (Some day)