Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to AC Volts Set meter to measure AC Volts
Gain access to PCB (use Insulation Mat as required)
WARNING! Mains voltage is expected during test, follow TOPs P4 live testing procedure
Mains Power On

Measurement:

Check for AC voltage at the input connection of the PCB.
This is the 6 way plug, 2nd from the rear of the PCB and the brown and blue wires in the top row of that plug.
Expect mains voltage