Usually would start by unloading the secondary. Next check the
primary feed back. This is the "RUN" VCC for the chip. Probably also used for
voltage sense.
Resistor CS is very low ohm & on the output FET ground. Overcurrent
will develop a voltage & trigger a shut down.
Some TV's with SMPS go into SD & give off a "tic, tic, tic....."
Ever since Motorola introed SMPS in Quasars its almost as if no two are alike.
They can be simple or super complex. Challenging ! Good luck.
73 Zeno
LFOD !