Hi,
There are a # of possiblities, 1- The predriver transitors in the output circuit are leaky, Usually that is assoiated with some crackling noise though the speakers. 2- The power supply But if you have B+ & B- and bias voltages that are normal and not fluctuating your good. Generally Protection circuits no not go bad that offen. If sounds like a transitor in any of the above mentioned circuits id lesky or weak. The best way to find that out is o use some freeze pray on them after it shuts down. If it is a weak tranX is should turn back on for a liitle bit untill it heats up again. If it is the fre drives in the out out replace all on both L&R channels.
There are a # of possiblities, 1- The predriver transitors in the output circuit are leaky, Usually that is assoiated with some crackling noise though the speakers. 2- The power supply But if you have B+ & B- and bias voltages that are normal and not fluctuating your good. Generally Protection circuits no not go bad that offen. If sounds like a transitor in any of the above mentioned circuits id lesky or weak. The best way to find that out is o use some freeze pray on them after it shuts down. If it is a weak tranX is should turn back on for a liitle bit untill it heats up again. If it is the fre drives in the out out replace all on both L&R channels.