Mac not charging after minor water damage

Hi guys.

I've got a friend's mac that got given to me to have a look at. The mac at first was not starting up at all after a water spill.

The laptop was then disassembled and thoroughly cleaned with alcohol to ensure there was not water residue left on the logic board.

I replaced the battery, and the DC jack. After replacing the battery the macbook started up without any problems.

My only problem is that, after trying 3 separate chargers (known to be working on other macs) the light on neither chargers will light up!

I don't have ANY colour light showing. Any one able to point me to what chip might needing to be replaced (if any) or if there's any tricks with the macbook chargers? I'm not too savvy with macs I repair windows laptops mainly.

I've cleaned the logic board about 3 times now without ANY sign of corrosion at all. Every chip looks to be fine (well as far as what my eyes can see).

Looking forward to a reply, peace.