Cant work with manual SO.....
If its a SMPS there is usually a short. Often the Hoz out or a 150 V
zener diode from main B+ to ground.
To keep from grenading when the SMPS sees over current it drops in
freq & screams or ticks. If the zener is shorted often the SMPS is
running wild & putting out too much V.
73 Zeno
LFOD !