Hello,
My friend asked me to replace the wire going from this SMPS 20v adapter to the charger for a 18v Lithium Battery for a drill.
The cable had frayed and been touching, as a result the 5 Paralleled R200 (0.2 ohm) resistors had blown O/C, they are connecting the main -ve rail to the output wire.
The output was jumping around 13v and dis-appeared when a load like the charger was connected, they measured 900ohms.
I experimented by replacing at first a single 0 ohm and then a 2.2ohm in and the output was restored at 21.62v and 21.65v respectively...