I have a Vizio TV and when the power button is pressed, the power button illuminates white but there is no picture and no sound at all.

Power cycling can solve a lot of odd problems with Vizio TVs. First disconnect the TV's power cord from the power outlet and leave it unplugged. Then press and hold the power button on the TV for 10 seconds. After you have held the button for 10 seconds, let go then try to power the TV on.

Check out the flash light test - if you see an image then the issue is with your inverter board that powers the back lighting.

I will try a new main board first.

Its the inverter board which is preventing the backlights from coming on very common issue. You can get the replacement inverter from www.tvrepairworld.com

how long did you leave it unpluged

I don't show we have any codes for the Vizio sound bar. Have you checked your Visio manual for the code; I know that Vizio TVs provide codes for different providers. If you still can't find a code, I have provided instructions on how you can perform a power scan for programming the remote.

Address To Other Equipment Using Power Scan

• Remote: All Remotes (except Basic)
  1. With the desired equipment on, press and hold the correct Mode button until all mode button back lights illuminate, then release.
  2. Press and release the Power button. AUX Mode: Before pressing and releasing the Power button
     • Press 0 for a TV
     • Press 1 for a VCR/DVD
     • Press 2 for any other device
     Then Press STAR (*)
  3. Press the Up button once a second while pointing the remote at the desired equipment. Note: If the code for the equipment comes up, the equipment will power off.
  4. Press the POUND (#) button. Note: If the code entered is valid for the remote, the mode light flashes three times.
     

Hi.
You need change the Main board. You have a micropros. problem.

Do you have back light when turning on the TV? if you do then just replace the main board should resolve the problem. if you do not have back light, you will need to replace the inverter board(s) depending on your model. The inverter board(s) is located on the left side of the TV facing back of TV. you may have two inverter boards depending on your model. the other is located on the right side of the TV. Both mount vertically.

I had the same thing just happen and I used the following instructions from the Vizio Website for "humming sound" on tv and it worked. My sound is now working!!!!

1- Power off TV

2- Unplug TV from outlet

3- Press and hold in the power button on the TV for 30 seconds (while it is unplugged from the wall)

4- Release the power button

5- Plug in the TV into a different outlet

6- Power the TV back on.

Reset the TV settings.