How to change the TV tuner system

[qanda]This question is published in the hardware section for the Philips 14PT6107 14. Click here to view full specs.[/qanda]I’m in UK at the moment, i have just bought a second user TV Philips 14PT6107/05, it works fine on DVD and video input but unfortunately no sound with watching TV. I have checked the SYSTEM setting it says Europe where it should be PAL-I for UK. I have tried changing using the remote but it won’t. I can change the country setting with no problem. Please if somebody knows how to change the setting Please let me know. Is there any procedure on how to change the TV system setting?