If you have lost both channels then it's something that is common to both that has gone. If one channel has gone, use the good channel as a guide. Here's what to do find the point where the pre-amp outputs to the power amp. With a screwdriver touch that point (make certain you only touch one metal point at a time = don't short anything). It should buzz! work backwards till the buzzing stops. It is easier to test with a channel working, but I think you will soon get to the faulty stage.
PS IC's are allways suspect when both channels out!
PPS Don't touch any power parts with the screwdriver!
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