Chosen Solution
Where can I purchase a power supply for my Apple TV 3rd generation
Here’s one source: AilExpress - PSU OT9031 Apple P/N: 614-0482 for Apple TV 2 and TV 3 A1378 A1427 A1469 MD199/572 EMC2411/2528/2633 2010-2013. You can also google for the part number to find other sources: ‘Apple 614-0482’
