I had purchased a refurb Onkyo in Dec. 2009 thanks to this forum at a reasonable price from Accessories4less: TX606.
Soon I found it has numerous issues. The coax inputs No. 1 failed, then both failed. I have TV OUT (component) and a old DVD player, whose inputs are component along with a tape player. The component out failed to work. Works sometime, sometime doesn't.
I took it to the service center and they refused to service it stating the serial # sticker is not present behind the unit.
I called A4L and they raised their arms which I understand.
I called Onkyo and they were extremely un-bending. I have the original box, receipts, everything and the box has the serial #. I do not know why my unit doesn't have the S.No sticker but I did NOT remove it (no reason to). As per them, it can never happen and thus someone did remove it.
This is horrible. (a) If they have so much dependency on a S.No. it shouldn't be a simple sticker. (b) They should have some policy where a product can be validated, like a sticker INSIDE the unit (c) They should ack. this as an issue and honor the warranty.
Personally, I think it's deceptive practices. They know which units are bad and cant be repaired and they ship these out to unsuspecting customers and then the customer can't get it warranty repaired. The parts and labor lady I spoke to, was extremely rude and very condescending. I have a full basement where I was planning to put a 2nd. unit and just now purchased an Onkyo Blu-ray player. I am returning the blu-ray and for basement rather will buy Denon or Marantz.