Picture and sound will not work all the sudden

Make sure the audio inputs are on the same input as the video cable.

If the picture is OK then check your sound cables, red and white if analog, or swap out the HDMI cable with one that you know works.
Also, on the SETTINGS screen make sure your audio is set to stereo not surround sound.

Is it hooked up with HDMI cable?

If so try unplugging the HDMI cable and re plugging the cable in, sometimes those cables work loose and if they are not tight, it will cause your screen to flicker. Happens to my TV once in awhile.

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Nothing to worry, You change to AV mode to TV mode and wise verse,
If nothing happen then call the service center, It only two months old.

had this problem for a while only just found the cause, its either your tuner flipped out which means you just neded to retune the tv and it should be fixed if not that there was this setting i found still not sure what it is or means but you could select these letters i think there was S, BG and some other ones but i changed it to the top one which was BG and it fixed the static sound with the clear picture problem just stuff around with the channel settings and see if you have that setting hope that helped

have your tuner check for any cold solder on pins.

go to tv menu, do an "autoprogram" and it will select all available channels.
You can also do an add/remove channel and manually delete the channels you know you don't have.
You can also change your tv from air to CATV (cable) On cable tv you can still get all the air channels and Fox just the numbers will be different, but you may have a better signal

If it was a setting on the television, then the cable info would also be affected. Try a reset on your cable box, as the cable info is generated within the box from the data stream, whereas the picture is streamed from the provider.

If the reset doesn't work, it's time to call the cable company - it's not a fault with your telly.

I have sound on video 2, and when on a static channel but not on the usual channel 3 which is TV. Just stoppen working one day and cant figure it out... Please help!

It worked fine yesterday. Sound on all channels. Sometimes the picture goes black on channel 6. We can get it back by going up one channel, then back to 6. it is due to cable signal ie weak. now there is no sound this is due to sound section 1 loose connect in sound section 2 speaker 3 problem in sound section some part must have failed.