There is no sound coming out of my jvc k series tv. it worked like 10 minutes ago. what went wrong?

Lemon. Get a refund or credit, or trash it.

You might want to take the back cover off and look for blown fuses in the power supply.
Just follow the power cord and you should find one or two fuses in the main circuit board. They`ll have a broken or burnt filament inside the glass enclosure and their values will be written on the end caps.
Replace them, but if they blow again then it means you`ll need repair before the set will work again.
Hope this will help Good luck
P.S please do not rate this answer(unless it helps) since this answer is only a suggestion/information.

Sounds like you were having a power failure in the community,, we call it a brown out. just turn it off and unplug it,, I'm not sure if this is what the problem is.. I had this to happen years ago on a magnvox console.. I will check and see what I can find out for your model tv..

utencilio posted this fix. It worked for my JVC LT-42X579.

Okay, I found a fix! Called JVC, spoke to somebody there, here it is:
1)unplug the TV completely, no wall no power strips, completely
2)wait 10 sec
3)plug TV back in and Turn it on, the light will still be doing the same thing
4)wait 30 sec
5)ON THE TV, not the remote, locate the menu, volume (-) and power button.
6)while simultaneously holding down the menu and volume (-) button, pressed the power button ONCE and continue to hold the other 2 for 10 sec.
7)on the remote control, go to menu>settings>system info
*** now this I know as a FACT will work on systems that display: JVC - ver.5.32FO001, but I don't know of any other versions***
8)press the mute button on the remote twice
9)unplugg TV again and wait 10 sec.
10) plug TV in and turn on

It SHOULD be working normally now... Thanx to the guys a JVC support for this one, I know it seems like an obvious first place to look, but sometimes it isn't. I for one checked online forums first

I think it's in sleep mode. On your remote, click the button that says 'sleep' until it says '0 minutes'

Its the power cap mine did the same thing about 11 months into daily use

make sure your front panel lock in your menu is not lock if is then unlock it cause it will lock everything on the tv in front and can't move anything

Nevermind, the unit fixed itself... i dont know what happend...

Ok have you go into your audio menu and check them. make sure that the amplifer is set to internal and not external. and the speaker are on... you could have a blown audio output ic.

check cold solder vertical circuit