I think its more of a hardware issue. Hmm.... at this point its better to be safe and put it back on NCC before you mess anything that will void the warranty. Pls just be patient. Its better to be sure than to be unsure.

Just think about it. what is 1 week compare to a life time that IF you mess up something and they find out and void your warranty. You will be dealing with that speaker as long as you use your precious n900

P.S. all the bestest dude. I fully hope you can get your N900 fixed. I hope i help even for a little bit. =)