Unscrew cover of mainboard with a Cross-head screwdriver.
Check if wires in mainboard area are broken or not.
DIAGNOSIS 1
Cut off the wire.
Peel off the sleeves.
Step 3
Make sure wires are in proper order and connect them.
Tin soldering.
Step 5
Cover connecting point with electrical tape.
CHECK AND TEST 2
Step 1
Screws cover of mainboard with a Cross-head screwdriver.
Perform current leakage test.
Put one detector on earthing wire of socket, and another detector on surface(metal part)