If the small transformer driven by FET471 is shorted (sometimes happens), it could cause the IC to shutdown in over-current protection. It's also possible that something connected to the output side of the transformer is overloading the IC.
If the transformer is out, connect only the two primary windings with jumper wires to see if the IC shuts down.
If the transformer is out, connect only the two primary windings with jumper wires to see if the IC shuts down.
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