How can I deactivate/deauthorize/disconnect Netflix on a PS3 that no longer turns on? I couldn't seem to find an option for it from my Netflix account settings on the computer.
Click that, and you'll be signed out of all of your devices. A while back I had the same problem with a broken XBox 360, and after contacting customer support, they told me this was unfortunately the only way.
Don't worry, though. It will only log you out of them - not ban them from your account. So you'll just have to log back in on the devices you want to use with Netflix.
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.