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    #1

    Vizio VP322 no picture no sound

    Hi guys
    Working on a Vizio VP-322 set with no picture.
    Went thru the power supply board found a couple of bad caps (dome shaped)
    Tested the rest with a ESR meter ended up replacing 9 caps total.
    Set has an amber light when pluged in , turns white and a relay click when power button is pressed,but no picture
    After searching around found some talk of the main board being bad
    F!,F2 and some regs AMC117 .The small fuses test good.
    Not sure how to test the AMC1117 or if the problem is in the main board.
    Any help??
    Last edited by hdman97; 10-12-2011, 02:56 PM.
    Tags: None
    #2
    Re: Vizio VP322 no picture no sound

    Originally posted by hdman97 View Post
    Not sure how to test the AMC117
    Measure the DC voltage on each leg of the voltage regulator with respect to ground. If the AMC117 has a suffix like -33, the -33 will tell you it outputs 3.3V DC.

    Report your voltages and if there is a suffix.
    Last edited by retiredcaps; 10-12-2011, 02:00 PM.
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      #3
      Re: Vizio VP322 no picture no sound

      Originally posted by hdman97 View Post
      Tested the rest with a ESR meter ended up replacing 9 caps total.
      1) BTW, if you ended up replacing 9 caps, most here would suggest you replace them ALL especially if the remaining caps are the same brand regardless if they tested fine on the ESR or not.

      2) What brand and series did you use for replacements?

      PS. Pictures always help. See my sig file in post #2 on how to attach them.
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        #4
        Re: Vizio VP322 no picture no sound

        These reading were with power on. main board

        using chassis grd.

        None of the AMC1117 had a suffix

        U7 ( 1) 2.0 (2) 3.3 (3) 4.9

        U4 2.0 3.2 4.9

        U8 0.0 1.2 2.5

        U9 1.2 2.5 4.9

        U515 1.3 2.6 4.9


        could U8 with a 0.0 on pin 1 be a problem?

        The caps that were replaced on the Power board were rated 105C some were
        chang some were Elite.
        Don't have a camera handy right now for pics
        many thanks.....
        Last edited by hdman97; 10-12-2011, 02:57 PM.

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          #5
          Re: Vizio VP322 no picture no sound

          Originally posted by hdman97 View Post
          None of the AMC1117 had a suffix

          U7 ( 1) 2.0 (2) 3.3 (3) 4.9

          U4 2.0 3.2 4.9

          U8 0.0 1.2 2.5

          U9 1.2 2.5 4.9

          U515 1.3 2.6 4.9

          could U8 with a 0.0 on pin 1 be a problem?
          Note you reported all the numbers to 1/10th of a decimal place. Unless your digital multimeter is very very poor, most multimeters have a 3 1/2 digit resolution so there should be another digit in your readings.

          The caps that were replaced on the Power board were rated 105C some were chang some were Elite.
          Let's try again.

          What brand and series did you use to replace the old ones with?
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            #6
            Re: Vizio VP322 no picture no sound

            According to the service manual, u8 pin2 should be registering +1.2v. U4 pin2 should be +3.3v and pin3 +5.0v. Service manual doesn't mention u7, u9, or u515, nor does it mention proper output on pin1 of U8. But pin2 on u9 and u515(?) looks a bit low if it should normally be registering +3.3v.

            Maybe trace back the route and see if there's an older cap on those circuits?

            Dan

            Comment

              #7
              Re: Vizio VP322 no picture no sound

              Originally posted by retiredcaps View Post
              Note you reported all the numbers to 1/10th of a decimal place. Unless your digital multimeter is very very poor, most multimeters have a 3 1/2 digit resolution so there should be another digit in your readings.



              Let's try again.

              What brand and series did you use to replace the old ones with?
              I used a Fluke 79 and I only wrote down to the 1/10th.Thought that wold be close enough.
              The brand on the caps was "Chang" and " Elite" printed on the cap,they were in a large kit of caps I got awhile back. Not sure what you mean by series.Sorry

              Comment

                #8
                Re: Vizio VP322 no picture no sound

                Originally posted by GbreadMan View Post
                According to the service manual, u8 pin2 should be registering +1.2v. U4 pin2 should be +3.3v and pin3 +5.0v. Service manual doesn't mention u7, u9, or u515, nor does it mention proper output on pin1 of U8. But pin2 on u9 and u515(?) looks a bit low if it should normally be registering +3.3v.

                Maybe trace back the route and see if there's an older cap on those circuits?

                Dan
                The known bad caps I had in the PS were C233 &C234.
                Possible they took out U9 on the main board?
                Thanks Dan

                Comment

                  #9
                  Re: Vizio VP322 no picture no sound

                  Originally posted by hdman97 View Post
                  I used a Fluke 79 and I only wrote down to the 1/10th.Thought that wold be close enough.
                  The brand on the caps was "Chang" and " Elite" printed on the cap,they were in a large kit of caps I got awhile back. Not sure what you mean by series.Sorry
                  Here is why resolution matters.

                  Voltage regulators should be within 1% of their stated value. If 3.3V is the correct value and you report 3.2V, then that voltage regulator is possibly bad.

                  3.3 x 0.99 = 3.267
                  3.3 x 1.01 = 3.333

                  Using generic caps like Chang and Elite is also not helping your situation.

                  The SMPS requires low ESR caps. Caps like Panasonic FR, FM, or FC series are "low ESR". Some caps are "general purpose". The difference in ESR between the 2 types is significant enough to prevent the SMPS from working properly.
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                    #10
                    Re: Vizio VP322 no picture no sound

                    I would say it's more probable that there are more bad caps. Judging from the pics and threads available online regarding the power board on this model, all of the original electrolytic caps on this board will eventually fail (little over a dozen).

                    It would be recommended to replace them with the recommended brands mentioned ad nauseum by the experts on this forum (Panasonic, Rubycon, United Chemicon, Samxon except GF's, Nichicons except HM & HN series, etc.). Throw away the Changs and Elites.

                    Comment

                      #11
                      Re: Vizio VP322 no picture no sound

                      Well I have to put this on the back burner for awhile as I will be out of town.
                      I did go through the PS with a ESR meter and changed most that tested good anyway. Will try and order some new caps and start over.
                      Thanks guys!

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