The invention relates to a method for verifying the operation of a billboard (1) comprising a plurality of light-emitting diodes distributed across a plurality of subunits (2), wherein each light-emitting diode receives a current having an intensity that corresponds to a control setting linked to the desired display, characterised in that said method comprises the following steps which involve: applying a predetermined common setting to each subunit (2) of light-emitting diodes; measuring the current consumed by each subunit (2) of light-emitting diodes; determining a mean value of the currents consumed by all the subunits (2); and triggering a malfunction alarm of a subunit (2) when the difference between said current consumed by said subunit (2) and said mean value exceeds a predetermined threshold.