Teac in motel mode?

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Greetings group.
I have a Base BA3409 ctv which I am told is the same as a Teac
There is no sound from the speakers, but sound is present at the audio
line out sockets.
If I connect an av source to the AV input sockets, I get picture but
no sound.

I think the tv has a motel mode.
Can anyone please tell me how to turn this mode on/off?

Thanking you,

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