Hi there I have an iPod touch 4 generation , it refuses play any external sounds , music etc from the external speaker , although it plays on my doc no problem! And headphones work ok. I have replaced the speaker with a brand new one several times , but each time it failed to address the issue !!! The problem has be on the motherboard! Can anybody please indicate , either by picture or description, where I would find on the board the IC chip responsible for the audio output , as I have not been able to obtain this info??? Many thanks