Hi, I could use the expertise of anyone familiar with this situation.

First, I have a 1999 Zenith 19" Model B19A02D TV, in good working order
except for this one glitch, which has now happened for a second time
within about four months.

Directly following a sudden cutoff of electricity, when the TV was
re-connected, there was no audio.

After fiddling with the remote control, at one point the closed caption
text started appearing on the screen, with no resumption of audio, even
despite repeatedly pressing the volume buttons (which normally
automatically disengages the mute function) and repeatedly pressing the
mute button on and off.

I started seeing the closed caption text after pressing the remote
button to the setting "C1" which, among other choices, seems to be the
only one which activates the text on my TV (or in this area).

BUT the menu option "CC When Mute" is still set at "Off", so there
shouldn't be any text appearing at all, even when I deliberately hit the
mute button.

Yet there it is, and there is no sound.

The first time this happened, I unplugged the TV set, waited perhaps ten
minutes, and plugged it back in, and VOILA, it reset itself, and the
volume control worked normally again, with the closed caption text gone.

This time, however, after unplugging the TV set many times, even
overnight, and then plugging it back in, no such luck, the mute is stuck
and the closed caption text is there instead of audio.

Is it possible that there is any sequence of codes I can enter through
the remote, or sequence of pushing buttons, which would reset the audio
and shut off the mute?

I have read elsewhere some vague information about a "service mode" on
TVs, along with warnings that to enter it without knowing the exact
sequence of actions to take will make things possibly irreparably worse
than before, but is there some way to safely find out exactly how to
either disengage the mute or to generally command the TV to return to
its factory settings?

Thanks in advance for any advice.

Bob