Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
Set Multimeter to DC Volts Set meter to measure DC Volts
Gain access to PCB (use Insulation Mat as required)
Remove the PCB
Remove the display PCB from the facia of the appliance
Refit the PCB
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Measure the voltage between each of the soldered points on connector X500 as listed in the table below to a suitable earth.
Soldered PointVoltage (approx.)
10 vdc
20 vdc
30 vdc
45 vdc
55 vdc
65 vdc

Are the voltages measured as expected?