RAP Amplifier KA901&KA901B

(1) Phyit phyit, shell...noisy sound is coming out about JRC4558IC which is using
    every places in it.
(2)Sometime audio output transistors and other parts spoil
(3) 50% transformer spoil
(4)Some of the sets ,display screen spoil
(5)Some of the sets ,Echo IC  spoil 40%