Sound but no picture on Vizio WS42L TV

Is there a picture on the screen when you shine a flashlight at the TV screen?

If yes then the backlights are not working!

Are you able to test the DVr with hdmi with another television?

Hello,
turn on the set, grab a bright flash light and dim the lights in the room. Shine the flash light on the screen, if you see a faint picture on the screen, you are dealing with a backlight problem. There are several things that can cause this. One, a bad backlight inverter, two, faulty 24vdc power supply, three, bad main board, or a bad faulty backlamp.

Check and replace the back-light inverter baord.

Check and replace the main power regulator board as card basis. It has damaged.

I have a vizio 42 " LCD TV, model #VX42L, I was watching tv last nite all
of a sudden there was not sound or picture, I could not turn the tv off, but I could turn the dvr off. Still no picture or sound.

you need to change the sustainer boards and TV will be good as new.

i have a 50 in vizio and the sound just went out. the picture still works but no sound anyone have any ideas on how much to repair it?

Same thing just happened to me contacted Vizio had me unplug the TV from the wall for about a minute and then replug and cut the TV back on and everything was fine. I have the television hooked into HDMI1.