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If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Unlock procedure and to override the password lock of many popular brand TVs and other devices are given. Search the site by type in this key phrase "How to unlock television"; in the search box at the top left of the display window, to get gathered related posts.
Check its speaker first. If found OK, check and replace damaged component/s at its audio output stage circuit. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/
If the set is in protection mode, that is normally caused by short circuit line output stage, short circuit frame output stage, short circuit audio output etc. It shouldn't be too dificult to fault find, even without a service manual. Look for an authorised Telefunken service centre.
Without knowing the specific model, I can only venture that somehow the Parental Lock has been engaged. Often to disable/disengage, a password/code of some sort is required with entry through the remote.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.