I have a color TV (aiwa sx2150)

One day suddenly when tv is switched ON, no sound is observed.
Even "sound" option from setup menu is also gone.
Not a single sound function is accessible from remote or on TV buttons.

Type of Reception (PAL, NTSC etc.)started coming while tuning, which
was not observed earlier any time.

in setup menu lenguage has started coming which was not there earlier.

In addition, total number of channels available is reduced from 210 to
99 only!
All other functions of Set is working OK.