Another 60PV250 pic fault but different this time. Help greatly appreciated

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  • jwarnes
    Member
    • Feb 2014
    • 29
    • Australia

    #1

    Another 60PV250 pic fault but different this time. Help greatly appreciated

    Had this one a while now. Great tv. Had usual bad inductor solder joints on Z board repaired with new fets and caps etc. Ran perfectly fine for another year! Then this new picture problem emerged. Checked all voltages and usual problems all good yet pic is still trash.
    Have a look at the photos.
    I cant figure out the reason for the black splotchy patches.
    It would be ok then appear when the tv warmed up.
    I have not mucked about with the Y board or buffers too much because the voltages all seem ok and the picture is mostly there.
    Does anyone have any clues what's going on?
    Cheers.
    Attached Files
  • mmartell
    Badcaps Legend
    • Oct 2013
    • 3189
    • Canada

    #2
    Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

    Not that I think it's the mainboard but run the test patterns.

    Comment

    • jwarnes
      Member
      • Feb 2014
      • 29
      • Australia

      #3
      Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

      How do you put this one into test pattern?
      I cant see the 4 pins?
      Photo attached
      Attached Files

      Comment

      • ReeceyBurger123
        Never Give Up !
        • May 2014
        • 7325
        • Britain

        #4
        Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

        Looks like Zsus issue to me, whats Zbias at ?
        Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

        https://www.facebook.com/Telford-Tel...7894576335359/

        Comment

        • jwarnes
          Member
          • Feb 2014
          • 29
          • Australia

          #5
          Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

          Thank you. Reevey can i just confirm with you first the correct way to measure the zbias?

          Comment

          • jwarnes
            Member
            • Feb 2014
            • 29
            • Australia

            #6
            Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

            I will retest all the voltages and put them up.
            Vs 203.1v
            Va 55.1v
            Vzb 110.3v
            Vy -179.9v
            VSC 149.5v
            M5V 5.15V
            And if i change vzb up to 115 or down to 105 picture does not change.
            Last edited by jwarnes; 09-15-2016, 04:50 PM.

            Comment

            • ReeceyBurger123
              Never Give Up !
              • May 2014
              • 7325
              • Britain

              #7
              Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

              Hmm so it seems the Sus voltages are fine theres a chance the ERC could be low but unlikely as normally if that area fails you would get no image, try running the test patterns as MM said this is done by bridging the Auto exgen pads on the controller and removing the Lvds cable.
              Last edited by ReeceyBurger123; 09-15-2016, 04:58 PM.
              Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

              https://www.facebook.com/Telford-Tel...7894576335359/

              Comment

              • jwarnes
                Member
                • Feb 2014
                • 29
                • Australia

                #8
                Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                So I've played with the TV picture settings in the menu and found it is greatly improved if i turn up the contrast to maximum.
                Ive repaired the zbias before and its running in spec which is why i don't think it is a z bias problem this time.

                Comment

                • jwarnes
                  Member
                  • Feb 2014
                  • 29
                  • Australia

                  #9
                  Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                  Is this the area i need to pay attention to?
                  Attached Files

                  Comment

                  • jwarnes
                    Member
                    • Feb 2014
                    • 29
                    • Australia

                    #10
                    Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                    Theres a pot on the Y board that says (SET-UP)
                    What is that for?

                    Comment

                    • ReeceyBurger123
                      Never Give Up !
                      • May 2014
                      • 7325
                      • Britain

                      #11
                      Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                      Bridge the copper pads between R51 & R52 with Lvds removed to get test patterns.
                      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                      https://www.facebook.com/Telford-Tel...7894576335359/

                      Comment

                      • jwarnes
                        Member
                        • Feb 2014
                        • 29
                        • Australia

                        #12
                        Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                        Test pattern images attatched
                        Attached Files

                        Comment

                        • tvtimmy
                          Badcaps Legend
                          • Mar 2015
                          • 1160
                          • usa

                          #13
                          Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                          That's got to be a zsus problem.
                          Smarter people than me to reply soon.......

                          Comment

                          • jwarnes
                            Member
                            • Feb 2014
                            • 29
                            • Australia

                            #14
                            Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                            Ive noticed the image is not good in normal mode viewing tv. Then if I go through the menu its still no good....untill that is when I get to the image wizard adjustment section where it goes to change the contrast. Two pics attatched. First one before and second pic after it suddenly switches to a vastly improved but not perfect picture.
                            Then upon exiting the picture wizard it goes back to extrememly poor picture and heaps of ghosting.
                            And I watched the vzb voltage through this. It didnt change.
                            Attached Files
                            Last edited by jwarnes; 09-15-2016, 05:53 PM.

                            Comment

                            • jwarnes
                              Member
                              • Feb 2014
                              • 29
                              • Australia

                              #15
                              Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                              If it has to be a zbias fault then what could it be if the dc voltage is correct? A timing issue? Is the zbias voltage a smooth dc voltage or should it be pulsing?

                              Comment

                              • mmartell
                                Badcaps Legend
                                • Oct 2013
                                • 3189
                                • Canada

                                #16
                                Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                                How many ribbons go to the panel from the zsus ? Are they clean and making good contact ?

                                Comment

                                • jwarnes
                                  Member
                                  • Feb 2014
                                  • 29
                                  • Australia

                                  #17
                                  Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                                  1 cable and yes i removed it and cleaned it today.
                                  What about one of the driver chips on the back of the z sus board that drive the fets. Could a blown driver chip make it do this problem?

                                  Comment

                                  • dick_barton
                                    Badcaps Legend
                                    • Aug 2015
                                    • 6642
                                    • Wales

                                    #18
                                    Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                                    What voltage would normally increase when you set the brightness from Standard to High since that may give you a clue as to where the problem is.
                                    Willing to help but I'm no expert.

                                    Comment

                                    • jwarnes
                                      Member
                                      • Feb 2014
                                      • 29
                                      • Australia

                                      #19
                                      Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                                      This is my thought also. Today I will test all the voltages and see if any of them change during the menu testing.

                                      Comment

                                      • jwarnes
                                        Member
                                        • Feb 2014
                                        • 29
                                        • Australia

                                        #20
                                        Re: Another 60PV250 pic fault but different this time. Help greatly appreciated

                                        Well i did that test today. None of the voltages change when i change the brightness and contrast.
                                        So im stumped. Anyone???

                                        Comment

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