Hi whatever I did to my 10yo TV (Samsung PS50A650T1F), it's gone into a boot loop. (either firmware update or tweaking the service menu)
I think these would fix it, though I don't hold out any hope of anyone being able to help:
1. hard Factory Reset without using the remote (TV in boot loop)
2. force firmware update via USB without getting into TV OSD Menu
3. there is a 3.5mm audio jack labelled "Service" .......
No luck finding a service manual on the internet.
Also: If anyone wants the TV please take it away!
I'm in Dunedin.