HelloAny one channel circuit of the amplifier has any sort of trouble, the amp will go to protect mode. It may be a direct short in it he output circuit. This is the common fault for these type of amps. A through check should be done to find out the reason. You must have sound knoledge in electronics, and experience to do this work by yourself. In most cases, unlike TVs, amps circuits are quite complicated and user cannot do it by themselves. OK.