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I put everything back after replacing the thermal paste in 3 places on the heatsink, but now I have no apple logo on the
display or sound on bootup … what did I miss this time?
There is no fuse in the headphone. I checked with a meter after my unit had sound from only one side, like yours. Apple did not want to repair it and offered a ten percent off on the 7th Gen model instead. I opened mine with a hair dryer and carefully inspected the headphone socket for damage with a circuit tester, no joy. I ordered a headphone part from eBay and replaced it carefully. No joy either, it still only has sound from one side. It's a paperweight now. I'll never get another Apple player. There are many others to choose from now.
Thats exactly what I used. A Hair dryer. But BE WARNED, in no way it will go back to what it looked like before you took it apart. Mine separated again after some months... it's just not designed to be opened by users.