You need a doner drive.
Look on ebay for a used a 840.
https://www.ebay.com/itm/Samsung-84...:GI8AAOSwluRbR3jN:sc:USPSPriority!90036!US!-1
Going from these pictures, you can probably use a 120GB to save you money.
Then you need to desolder that chip and resolder it onto the broken drive.
However that might not fix the problem. It could of burn out in other places and you be risking bricking the 120gb.
Luckily its only a 25 dollars.
Depending on how good your solder skills are its quite a tricky solder job honestly with all those resistors.
I don't know if i personally would be comfortable attempting it.
You may want to call around repair shops and see if they will attempt a solder repair if your not the best with a solder.