Hello[br]
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Take a look at the steps needed to find a short circuit with a multimeter
Check inside the charging port for any obvious unsafe conditions,
such as short circuit betwen positive and negative connector.
[image|3024675]
You have to touch the black probe multimeter to the negative and the red probe to the positive chargir port.
if you are seeing a value of 1 or OL, then there is a short circuit in your electrical circuit.
clean your solder with a solder wick and do the test again with a multimeter, is it still short or not
if you seing a certain resistance value other than OL, means your charging port has no problem,
the problem is other part on motherboard
Send it to a professional to get service handling assistance.
good luck