I owned one. Probably an SM1971P. Top of line 19" at the time.
System 3 with 9-160 hv/power supply board. Also has an
early comb filter & gives an outstanding pix. Its also a
clock TV that can be set to turn on & off. And its full RAT cable
ready with add/skip. The cats ass in 1981
With phone plugged in the TV will ring. Press a button & the
set mutes & you talk & listen to TV. You can also make calls
on the TV using the remote. The OSD shows the phone ##.
Very expensive new so not a lot sold. This is a keeper IMHO.
In any case dont scrap it !
When you get it open we will help with it, there are hidden tricks to getting the board out.
BTW for the phone you NEED the right remote. All other functions
work with any Zenith IR remote.
73 Zeno
