Cool down first the unit for about 5mins.Disconnect all input and the speakers connected to isolate the problem. Power it on then observe while playing it naked. If the symptom still there then I've suspect that you have a fault on the FF: 1. Power supply - might have an unregulated supply caused by leaky capacitor. 2. Pre-amplifier circuit - might be faulty. 3. Output IC - IC is leaky which overheat after a minute which trigger the unit to protect. This is not diy and need to send to repair shop. If the symptom gone after you played it naked then I've suspect the ff: 1. Short on speaker wire. 2. Short on speaker voice coil. 3. Short on input. Thanks for using fixya.
Answers & Comments
Cool down first the unit for about 5mins.Disconnect all input and the speakers connected to isolate the problem. Power it on then observe while playing it naked. If the symptom still there then I've suspect that you have a fault on the FF: 1. Power supply - might have an unregulated supply caused by leaky capacitor. 2. Pre-amplifier circuit - might be faulty. 3. Output IC - IC is leaky which overheat after a minute which trigger the unit to protect.
This is not diy and need to send to repair shop. If the symptom gone after you played it naked then I've suspect the ff: 1. Short on speaker wire. 2. Short on speaker voice coil. 3. Short on input.
Thanks for using fixya.