Hi, wanna to ask... got big problem

I have connected a power cord wrongly to my HDD, so when i turn it on, it smelled like burning and i saw little smoke on top of it... the result is: its dead!!

have i destroyed my HDD?? can i just change the small 'motherboard' on the HDD to a new one, or a secondhand, in order to get back to 'life'?

because i really think the HDD is not yet corrupted, only the 'HDD motherboard', because the smoke just came from it, not from other part. I have try to reconnect and on it again and again, but its remain dead... no sign of life.. non!

please someone?

actually... the value is not the HDD itself, but the data inside....
that's why i am would like to try the best way to retrieve the data...

no warranty anymore...

any suggestion?