Depends on what sound it is. If it's a hum, then it could be a fault. If the hum is on one channel then the place to look is that channel. You can compare the good channel with the bad one for clues as to what.
If it is in both channels then you are looking at the power supply. Or something common to both channels.
Hum is most often caused by Electrolytic Capacitors.
Crackling noises are caused by resistors, or transistors, or IC's.
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