Led module with isolation fault detection

A method (200) for detecting an isolation fault condition of a LED module (802) supplied with electrical power by a non-isolated switched LED converter (801), the switched LED converter (801) having a control circuit (701) for issuing a control signal for at least one switch (HS_FET, LS_FET) and being supplied with at least one feedback signal (803) from the LED module (802) in order to implement a feedback-controlled operation of the LED module (802),

• the method (200) comprising the step of:
• obtaining and analysing (201) a signal (300, 400) indicating the operation frequency of the switch (HS_FET, LS_FET) of the switched converter (801) in order to evaluate the contribution of a harmonic in the frequency range of a mains voltage supplying the converter (801) in said signal (300, 400), and
• stopping or reducing (202) the electrical power supplied to the LED module (802) in case the contribution of said harmonic exceeds a given threshold value during at least a preset time period or preset number of cycles.