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This will be the large Electrolytic Capacitors in the Power Supply. You can't miss them. They will over 4700uf or around that in value. Replace them all, even if only one has gone. I think what your hearing is the 50/HZ hum from the mains getting in.
Ur high voltage is going through FBT,the big black block of plastic with a wire red or gray solder to the board.The Flyback transformer.There a steel "3 inches like a paper clip like steel.Put some supper glue on that "3 steel paper clip look like, will help or stop loud wishling noise all together.
go to control panel
sound and audio devices
under voice recording clk volume and mute the mic phone...........
some how your mic is conflicting with speakers. Keep your mic away from your speakers..
There are a few variants for this model depending upon the serial number. From your description, there are some capacitors in between the amp stages called coupling caps that are failing. The hum is some DC current being passed through the output stage. The crackling is probably just dirty controls.
More often than not, the humming sound on any electronic device is brought about by the AC side of the power supply not only of the device itself but also all other equipment it is attached to. In your particular case, it maybe introduced into the system from:
(coaxial) cable TV leadin;
connections of DVD, VCR, game consoles and others;
electrical noise from lamp dimmers, lights with electronic ballasts, wireless phones.
It is interesting to note, that the noise could be from other appliances plug in the same circuit as the TV, you of course could try plugging it into another outlet or branch. In some instances, you could even try filtered regulators similar to those used by desktop computers.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.
Disconnect any input cables from the amp. Turn down the volume controls and disconnect the speakers. Power back on. If you still blow fuses with nothing hooked up, have the amp fixed.
If the fuse holds, shut down and connect the speakers, leaving the volume controls down. Power up and see if your fuse holds. If you have hum, an output transistor is most likely shorted. If you have no noise, SLOWLY turn up the volume controls and listen for the hum. If all is quiet, turn down the volume controls and connect your input cables and turn the volume back up. Noise? check your cables!