If you are using the internal amplifier of the radio your problem is the amp IC blown. I can give you the part number of it if you plan on replacing the IC yourself. If you do not have a soldering iron, solder, and solder wick (to remove solder from the bad IC), you would not be able to do this.
If you are using external amplifiers you have a common problem that is also going to require that you replace a component that is also soldered onto the circuit board.That component is a surface mounted fuse for the RCA outputs of the radio. It is not the normal type of fuse that is like a glass fuse or blade fuse inline on the wiring. This would be a fuse that is very small and right on the circuit board.
This solution is valid if I understand your problem properly, that your radio has no audio output from the tuner or the CD player at any time and only a popping noise when it is turned on.
I repair these type of electronics for a living. I work at an authorized Pioneer service center. So I do know what I am talking about. If you require any further help just let me know, reply to this post and I will get back to you as soon as I can. If you have a multimeter to check voltages II can even guide you thru troubleshooting the exact problem so you will not be just guessing at which of these two problems it may be.
If you have found this free information to be useful, a FixYa! rating would be appropriate and very much appreciated.
Thanks,
Dave
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