In a sound system there is an input selector switch which just connects the input socket you want to use to the "common" amplifier electronics inside...You say that the CD is fine so in this case it must be a faulty selector switch or broken copper tracks or wires inside the chassis electronics which connect those inputs.. through the selector switch to the amplifier circuitry.
The fault lies between the selector switch and the input sockets that dont work.....Not the CD one of course... thats fine..
Cheers From YUBEUT
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