An aluminum copper clad material has excellent bonding strength and includes an aluminum layer and a copper layer that are bonded without a nickel layer interposed therebetween. The improved circuit advantageously provides a higher resolution of the black level adjustment, and a short cut-off convergence time when the TV set is switched on. The microprocessor inputoutput port is coupled to the input of the FET for turning the LED ON and OFF and performing fault protection and diagnostics.