It is for sure that you have a short in the amplifier and so will need to open the set to identify before the power is switched on. So first of all use a good multimeter to check for short in the output drivers. Disconnect the power line to the drivers and see if the set triggers on. If not trace it to the circuit near the power supply which makes the fuse blow. It can be easily found out by checking for the short or the voltage drop when powered. I hope you could try. Good day
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