The datasheet for all the Wolfsons in the iPods usually recommend a capacitor after the DAC. I haven't seen an amp after the DAC in the 5G, so I think you're wasting your time looking for it. A picture would definitely help, but I think you might need to be replacing some SMD caps. I imagine there would be some form of output current limiting such that the short circuits that happen when you remove the headphone jack would not kill the elements, but maybe there's something else at play here. We had one guy replace the SMD caps on his mini, so maybe that's what you might be looking to do.
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