Hi @naica
Here's the schematic for the motherboard.
Go to p.51 / 60 and follow the path from the jdcin1 connector (DC-In jack) through the PF1 fuse to the VIN circuit reference then find VIN ref. on p.53 / 60 and check PQ311, PQ312 and PU301 and all associated components connected to that path.
if the components aren't marked on the board, then you may have to find a boardview diagram for the motherboard. I couldn't find one. Only the schematics. You may have better luck.
Here's the maintenance and service guide for the laptop that will help to gain access to the motherboard.
crwdns2934105:0crwdne2934105:0
crwdns2934113:0crwdne2934113:0
crwdns2915270:0crwdne2915270:0
crwdns2889612:0crwdne2889612:0
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