Panasonic TH-65PX600U Service Manual page 26

F-STB-14V
The 15V output from the secondary circuit of the power supply is applied to Q556.
In order to generate the FSTB14V, the F STB ON/OFF command (high) from pin 18 of
IC501 is applied to the gate of Q524 to turn it on. Q524 outputs a low to turn on Q556. The
transistor Q556 outputs the FSTB14V to pin 1, 2, and 3 of connector P10.
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