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Repairing Vizio P42ED PSU Board 53a

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    #1

    Repairing Vizio P42ED PSU Board 53a

    OK, since my first repair went well, I am moving on to my next project. This is a PSU board (53a) from a Vizio P42ED 42in Plasma EDTV. These boards are well known for early failures. I have counted a total of 37 caps. Out of these 37 caps, I am going to replace 31 of them. I am going to avoid replacing the 6 largest caps at first. I have tested them (sort of) and feel they are still functional. Not to mention that I have received advice that larger caps are less likely to fail than the medium to small sized caps.

    On to some pictures so you all can see what I am working with...
    Attached Files
    Tags: None
    #2
    Re: Repairing Vizio P42ED PSU Board 53a

    As before the first step is to ID and spec the original caps and make a list.
    Step 2 is to make a cap-map [before removing caps] so if your project gets interrupted and you have to come back later you have a record of what was what.
    Step 3 is to compare the list to the map to make sure you didn't miss any.
    - No one around here has ever missed a cap on their map or their BOM and not found out until after the cap order was 'in'. [~~ RIGHT!~~]
    .
    When I know the brands involved I'll point you to the data sheets so you can spec them out yourself.
    .
    Mann-Made Global Warming.
    - We should be more concerned about the Intellectual Climate.
    -
    Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
    - Dr Seuss
    -
    You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
    -

    Comment

      #3
      Re: Repairing Vizio P42ED PSU Board 53a

      Don't forget to indicate polarity on your map.

      Just FYI: #34 and #35 have plastic on top that's held on by the sleeve.
      The plastic will bulge even if the caps itself isn't so you have to push on the plastic with your finger to tell if they are bloated underneath the plastic.
      The plastic is just there as insulation because in some applications the top of the cap could cause grounding problems with nearby parts.
      .
      Mann-Made Global Warming.
      - We should be more concerned about the Intellectual Climate.
      -
      Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
      - Dr Seuss
      -
      You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
      -

      Comment

        #4
        Re: Repairing Vizio P42ED PSU Board 53a

        Some of the caps are in hard to see spots, so my plan was to map out the caps (I simply use the full res photos), verify the PCB polarity notations, and then remove the caps I want to replace. Since I have stickers on each cap, I know where they belong.

        After I have all the caps out, then I can identify all of them in a list and post them here. I think they are mostly Samwha caps. Most of them are too close together or too small to read their specs. I will have the list of caps and specs shortly.

        Comment

          #5
          Re: Repairing Vizio P42ED PSU Board 53a

          That works.

          Here is Samwha's e-cap product page.
          http://www.samwha.com/electric/templ...product23.html

          If you find one that isn't there check their 'discontinued products' list.
          Mann-Made Global Warming.
          - We should be more concerned about the Intellectual Climate.
          -
          Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
          - Dr Seuss
          -
          You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
          -

          Comment

            #6
            Re: Repairing Vizio P42ED PSU Board 53a

            Here is a list of the caps I removed:

            1) Samwha WL 50v 470uF 105° S1A 13x20x5
            2) Samwha WL 50v 470uF 105° S1A 13x20x5 (Same as #1)
            3) Samwha WL 16v 1000uF 105° S1A 10x21x5
            4) Samwha RD 35v 470uF 105° S5A 10x17x5
            5) Samwha WL 16v 1000uF 105° S1A 10x21x5 (Same as #3)
            6) Samwha RD 25v 1000uF 105° S6A 10x20x5
            7) Samwha RD 10v 2200uF 105° S5A 10x20x5
            8) Samwha RD 10v 2200uF 105° S5A 10x20x5 (Same as #7)
            9) Samwha RD 10v 2200uF 105° S6A 10x20x5
            10) Samwha RD 10v 2200uF 105° S6A 10x20x5 (Same as #9)
            11) Samwha RD 100v 330uF 105° S5A 13x24x5
            12) Samwha RD 100v 330uF 105° S5A 13x24x5 (Same as #11)
            13) Samwha RD 100v 330uF 105° S5A 13x24x5 (Same as #11)
            14) Samwha RD 100v 330uF 105° S5A 13x24x5 (Same as #11)
            15) Samwha RG 25v 100uF 105° S2A 6x11x2
            16) Samwha RG 50v 4.7uF 105° PDA 5x11x2
            17) Samwha RD 100v 330uF 105° S5A 13x24x5 (Same as #11)
            18) Samwha RD 10v 2200uF 105° S6A 10x20x5 (Same as #9)
            19) Samwha RD 35v 470uF 105° S5A 10x17x5 (Same as #4)
            20) Samwha RG 35v 47uF 105° S4C 6x11x2
            21) Samwha RD 35v 220uF 105° S5A 8x12x3
            22) Samwha RG 250v 1uF 105° S3A 7x11x2
            23) Samwha RG 35v 47uF 105° S3C 7x12x2
            24) Samwha RG 50v 1uF 105° S2C 5x10x2
            25) Samwha RG 50v 1uF 105° S5C 5x10x2
            26) Samwha RG 35v 47uF 105° S4C 6x11x2 (Same as #20)
            27) Samwha RG 50v 22uF 105° S5A 5x11x2
            28) Samwha RG 50v 22uF 105° S5A 5x11x2 (Same as #27)
            29) Samwha RG 50v 22uF 105° S5A 5x11x2 (Same as #27)
            30) Samwha RG 50v 10uF 105° RDA 5x11x2
            31) Samwha RG 50v 47uF 105° S2A 7x10x2

            Now, should I simply replace with the exact same caps? I have not heard bad things about the Samwha brand, but this is a well known chronic issue with this particular model of PSU. I am wondering if switching brands would be advisable?

            Comment

              #7
              Re: Repairing Vizio P42ED PSU Board 53a

              No, you look in the data tables for Samwha WL, RD, RG for those caps and find the Ripple and ESR.
              If ESR isn't there just use Ripple.
              Then you find caps of a good brand that meet or beat those specs.

              That's what this was:
              http://www.samwha.com/electric/templ...product23.html
              Click on the series name and the pdf specs sheet will come up for that series.
              .
              Mann-Made Global Warming.
              - We should be more concerned about the Intellectual Climate.
              -
              Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
              - Dr Seuss
              -
              You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
              -

              Comment

                #8
                Re: Repairing Vizio P42ED PSU Board 53a

                I can't seem to find a datasheet for the discontinued RG series. They only note that the RG series was replaced by the RD series. I have found the ripple for every RD model that would match up with the RG model. However, there is no RD model that would match #22. What should I do now?

                Comment

                  #9
                  Re: Repairing Vizio P42ED PSU Board 53a

                  >>I can't seem to find a datasheet for the discontinued RG series.<<

                  Attached Samwha RG datasheet.
                  Attached Files
                  veritas odium parit

                  Comment

                    #10
                    Re: Repairing Vizio P42ED PSU Board 53a

                    I could only find ripple values for most of the caps (RD & RG). So now I am looking for recommendations on replacement caps.
                    Attached Files

                    Comment

                      #11
                      Re: Repairing Vizio P42ED PSU Board 53a

                      OK, so it took me a few hours to do this, but I think I have my cart all set with the proper caps. Anyone that has an input, by all means, please give me any advice you think will help.
                      Attached Files

                      Comment

                        #12
                        Re: Repairing Vizio P42ED PSU Board 53a

                        Looks like you're gettin' this stuff down.
                        Choices look good.
                        Mann-Made Global Warming.
                        - We should be more concerned about the Intellectual Climate.
                        -
                        Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                        - Dr Seuss
                        -
                        You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                        -

                        Comment

                          #13
                          Re: Repairing Vizio P42ED PSU Board 53a

                          Sweet! Well, I did have some great tutoring!

                          I am placing my order today, hope to see the caps by early next week.

                          Comment

                            #14
                            Re: Repairing Vizio P42ED PSU Board 53a

                            Small change of plans. They were out of stock on the first line item (#1-2), so I substituted the HE series instead. I hate waiting for backorders.
                            Attached Files

                            Comment

                              #15
                              Re: Repairing Vizio P42ED PSU Board 53a

                              That will work too.
                              Mann-Made Global Warming.
                              - We should be more concerned about the Intellectual Climate.
                              -
                              Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
                              - Dr Seuss
                              -
                              You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
                              -

                              Comment

                                #16
                                Re: Repairing Vizio P42ED PSU Board 53a

                                I just noticed that the site no longer calls me a "Newbie"!

                                WooHoo!

                                Comment

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