Vizio P50 HDTV20A

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  • gideon277
    Member
    • Jun 2013
    • 42
    • United States

    #1

    Vizio P50 HDTV20A

    Okay this is a 50" Plasma Television. The TV powers on I have sound on all inputs. The Picture though is terrible and transitionally fades into existence only after considerable warm up. The picture when it finally comes up ends up patchy with a fuzzy appearance and sometimes patches are missing other times they are not. The picture is always darker than it should be.
  • johnboy1313
    Badcaps Legend
    • Nov 2012
    • 1959
    • USA

    #2
    Re: Vizio P50 HDTV20A

    Pictures?

    Comment

    • gideon277
      Member
      • Jun 2013
      • 42
      • United States

      #3
      Re: Vizio P50 HDTV20A

      This is a pretty typical state for the t.v to be in. Caps look okay.
      Attached Files

      Comment

      • PlasmaRon
        Member
        • Nov 2013
        • 40
        • USA

        #4
        Re: Vizio P50 HDTV20A

        The caps on the PS look ok? I think I've yet to see one of these P50 sets that doesn't have some puffed up caps on the power supply. I'd still start out by checking the voltages to the panel.

        Comment

        • patrax
          Member
          • Feb 2014
          • 33
          • USA

          #5
          Re: Vizio P50 HDTV20A

          Definitely looks like a Psu cap to me . Even if the look good my bet is there is a bad one on the board. I have repaired two of this exact model and both had a cap that looked fine but upon further testing/replacing it was a Psu cap. Fluctuating voltage causes this condition because of a bad capacitor.

          Comment

          • mmartell
            Badcaps Legend
            • Oct 2013
            • 3189
            • Canada

            #6
            Re: Vizio P50 HDTV20A

            Is it my eyes or does the menu look ok ?

            Comment

            • tw2005
              Badcaps Legend
              • Oct 2011
              • 6458
              • Australia

              #7
              Re: Vizio P50 HDTV20A

              Looks like failed ZSUS assuming it's LG based panel or xmain if samsung but I'm expecting this is LG.

              Comment

              • gideon277
                Member
                • Jun 2013
                • 42
                • United States

                #8
                Re: Vizio P50 HDTV20A

                okay the tv is in fact Samsung based. No caps appear to be bad as I can tell here are some more photos.
                Attached Files

                Comment

                • gideon277
                  Member
                  • Jun 2013
                  • 42
                  • United States

                  #9
                  Re: Vizio P50 HDTV20A

                  I did find one bad cap on the xmain a smaller one. I replaced it but it did not fix the problem. I have noted a high pitch noise coming from the powersupply right where another cap is. I guess I am going to start taking some readings to see what my voltage is. Any suggestions?

                  Comment

                  • tw2005
                    Badcaps Legend
                    • Oct 2011
                    • 6458
                    • Australia

                    #10
                    Re: Vizio P50 HDTV20A

                    Check the power to the Xmain and the fuses (1 ceramic, 3 green pico) on that board. There's a Vs and Ve test point on the PCB next to CN4701 where power enters.


                    Edit: Samsung manual added.
                    Attached Files
                    Last edited by tw2005; 02-21-2014, 04:37 PM.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: Vizio P50 HDTV20A

                      X-main fault, IMHO.
                      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                      Comment

                      • gideon277
                        Member
                        • Jun 2013
                        • 42
                        • United States

                        #12
                        Re: Vizio P50 HDTV20A

                        Okay voltages going to xmain are 88.8, 88.8 ground ground 6.3 that is going from left to right on the power supply itself no cable connected. I have tried other settings on my volt meter but get 1 on all pins expect last pin which gives me 14. I am at a loss going back to possible power supply issue.
                        Last edited by gideon277; 02-21-2014, 04:56 PM.

                        Comment

                        • tw2005
                          Badcaps Legend
                          • Oct 2011
                          • 6458
                          • Australia

                          #13
                          Re: Vizio P50 HDTV20A

                          that's a problem in my eyes, should see Vs or 200v or so not 88v?

                          maybe post#5 is something to consider, watch out for dry joints

                          Comment

                          • tw2005
                            Badcaps Legend
                            • Oct 2011
                            • 6458
                            • Australia

                            #14
                            Re: Vizio P50 HDTV20A

                            What's Vs at the Ymain?

                            Comment

                            • gideon277
                              Member
                              • Jun 2013
                              • 42
                              • United States

                              #15
                              Re: Vizio P50 HDTV20A

                              At the ymain it is 89.7, 89.7 and 6.4

                              Comment

                              • gideon277
                                Member
                                • Jun 2013
                                • 42
                                • United States

                                #16
                                Re: Vizio P50 HDTV20A

                                I ajdusted my voltmeter up a bit and now I get 207, 207, and 14 that is for x-main and y-main. I am having problems testing for continuity and have a feeling my meter is screwing up.

                                Comment

                                • gideon277
                                  Member
                                  • Jun 2013
                                  • 42
                                  • United States

                                  #17
                                  Re: Vizio P50 HDTV20A

                                  Okay found a bad inline fuse on the x-main board just did a temporary jumper to test the theory and bingo it worked. I should be able to replace that fuse tomorrow and t.v will be working. I suppose I could just leave the jumper in place but I would rather fix it properly.

                                  Comment

                                  • tw2005
                                    Badcaps Legend
                                    • Oct 2011
                                    • 6458
                                    • Australia

                                    #18
                                    Re: Vizio P50 HDTV20A

                                    Originally posted by gideon277
                                    Okay found a bad inline fuse on the x-main board just did a temporary jumper to test the theory and bingo it worked. I should be able to replace that fuse tomorrow and t.v will be working. I suppose I could just leave the jumper in place but I would rather fix it properly.
                                    Which fuse? Post a picture of it working and definitely get the right fuse in case there is an issue of too much current draw.

                                    Comment

                                    • tw2005
                                      Badcaps Legend
                                      • Oct 2011
                                      • 6458
                                      • Australia

                                      #19
                                      Re: Vizio P50 HDTV20A

                                      Originally posted by gideon277
                                      I ajdusted my voltmeter up a bit and now I get 207, 207, and 14 that is for x-main and y-main. I am having problems testing for continuity and have a feeling my meter is screwing up.
                                      I've seen this before with other meters used in posts. A good quality autoranging meter is a sound investment.

                                      I have a 20year fluke I picked up for $30 and it's excellent, ex government disposal.

                                      Comment

                                      • gideon277
                                        Member
                                        • Jun 2013
                                        • 42
                                        • United States

                                        #20
                                        Re: Vizio P50 HDTV20A

                                        This is what the menu is supposed to look like compare to the first photo I submitted on this post.
                                        Attached Files

                                        Comment

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