Will cutting the sound cables do any long term damage? If anybody read the question here I have now commited to dissecting the tablet completely, because SCIENCE! Anyway, only one thing is keeping the back connected to the main tablet: the two cables that connect the main motherboard to the speaker.

So, this is it:



So, to my question: will cutting these cables result in unfixable hardware issues. To clarify,  by unfixable I mean destruction of hardware e.g. cutting off power to an important segment. The obvious lack of sound is no issue to me, I can just wire it back if I want (which I won't, for personal reasons)
You should be fine (95%). It's nothing more than electricity. Just make sure to seal it up really well when done modifying your phone.