I just found this thread because my Cinema 600 died one month short of 3 years. I have to give props to Klipsch in my case because they sent me a Cinema 800 for replacement free of charge and told me they don’t want the 600 back and I can do with it as I see fit. So…. I plan to attempt the repair on this thread and use in another room. Thanks for all the info here and I will follow up after the new power supply comes.