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I'm not sure about what preset option you are asking for. If it is to reset the parentia passcode reset; key in '7777' will reset the set to its factory preset code '0000'. You can reset the passcode afterwards. If you wish to picture, sound etc; to return them to factory preset, select each window, hilight the reset option and pres enter. This will reset the that window settiing to its factory preset. OK.
I had a similar problem.. What's needed is to change the audio mode of the tv.
You may need the original tv remote to access it's setup menu or maybe able to do it with onboard buttons. (not the channel setup, but the screen brightness and hue and other stuff - Audio setup)
When entering the audio setup, you may find you're in surround sound or some other "type" of sound processing. Maybe simple Speech mode will suit you. Try different modes till you find a happy medium for your own taste.
you have lost the video, either because the vertical section or the deflection circuit stopped working. if the power supply is independent from the others circuits is going to work and the video does not