Set Appliance State:

Set Multimeter to DC Volts Set meter to measure DC Volts
Ensure no demands
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Measurement:

Measure the voltage between the bottom pin (as indicated by red probe in the picture)
at connector X2 to pin 5 (white) at connector X5 on the display PCB.
With no demand voltage should be approximately 0V DC.