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Help Vizio VW32LHDTV10A no pix no sound no backlight

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    #1

    Help Vizio VW32LHDTV10A no pix no sound no backlight

    I am trying to troubleshoot a VW32LHDTV10A. The orginial complaint is that it would sometimes not power up (VIZIO turns white but no picture no sound no backlight). Since this is an intermittent issue I am having trouble with diagnosis. The first time I tried to turn it on the problem showed up. When I turned it off and back on the unit turned on normally. I let the unit run for about 6 hours before it shut it itself off. Let unit set unplugged for several days before I could examine it. Since that time everytime I plug it in and turn to test it, it works. Checking the voltage regulators I get the following voltages

    U2 2.07 3.34 5.13 AMC1117
    U7 0 1.28 3.32 AMC1117
    U8 2.06 3.33 5.18 AMC1117
    U9 0 1.51 3.33 K1117S15
    U10 1.38 2.63 5.13 1084
    U33 2.05 3.32 5.14 AMC1117
    U3 11.96 0 5 7805


    Looking at some of the other treads these voltages look in range to me. Also this board is loaded with Taicon lytic caps.

    Any thoughts?
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    #2
    Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

    I had something similar that made me simply buy a replacement mainboard. The processor on mine was getting too warm.
    The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

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      #3
      Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

      That might explain the shutdown, but I can't find anything on the original problem.

      Comment

        #4
        Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

        The problems are all included within the mainboard.

        Here's some info on a related Vizio.

        https://www.badcaps.net/forum/showth...ighlight=vx42l

        When researching this problem try to use these different vizio model numbers. They're not all built the same but they all share common failures.

        VX42L
        VW42L
        VO42L
        VX32L
        The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

        Comment

          #5
          Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

          Sorry the brain didn't connect with the fingers on the last post. An overheating processor wouldn't cause the original problem. I have looked at a lot of the other threads and have checked all of the regulators. Unless I have missed something all of the voltages seem to be in range. I unfortunately do not own an ESR meter so I can't check the caps.

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            #6
            Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

            Using the numbers taken from the photo " 0171 2272 2292", I found a replacement mainboard on ebay for $60. There is no shipping cost and theres a seven day return policy. This is a cheap time saving thing to try since you've kinda weeded out the usual stuff.
            The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

            Comment

              #7
              Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

              I wonder if I might have a cold solder joint somewhere?

              Comment

                #8
                Re: Help Vizio VW32LHDTV10A no pix no sound no backlight

                Mine is similar. However how hot is normal for the processor? I think it would get warmer when in use. Mine gets quite warm but all the voltages are still normal.
                Mine just has P/S problems, and today I am going to try soldering around on the P/S to see if it will revive the missing 12 and 24 section.
                I would love to know what PIN 1 of J1 the PS_ON voltages are when set is in standby and when set is on. When I attempt to strap mine to 3.3 or 5v it only causes the relay to click amd shut down the P/S as it is normally closed, and feeding AC to the main section.

                Something is just plain flaked then...

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