How can I attach Bluetooth speaker to TV with no audio-out jack, other than optical-out and Bluetooth transmitter/receiver?
If you are connected through TV a cable system you can connect your speakers to the audio out connection on your cable box. If your cable box doesn't have audio out your cable company will trade you cable boxes and give you one with audio out.
You could connect a speaker to line level converter to the speaker wires of the TV internal speakers and connect a BT transmitter to it. Not electrically complicated but you would have to get into the TV and it would void the warranty.