Idle voltage at 17 Volt instead of 6.8 V after changing MagSafe cable
I replaced my broken MagSafe 1 cable with a replacement cable and get some weird idle voltages:
However, after attaching/soldering the replacement cable to the two PCB pins, I get an idle voltage of around 17 V. As far as I understand, this is the regular charging voltage at load, but not at idle. Since I ordered two of these replacement cables, I tried the other one, but got the same result: ca. 17 V at idle.
My MacBook Pro is charging with the repaired cable, but does not light up the green LED inside the magnetic connector when fully charged. I assume that this is due to the power supply not reducing the voltage to the required 6.8 V at idle.
Does anyone know how to fix the idle voltage and get proper charging behaviour?