lg 50pa4500 picture very bad

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  • tonytiger
    Senior Member
    • Jan 2010
    • 163
    • canada

    #21
    Re: lg 50pa4500 picture very bad

    i did the self test and yes the color partern was there but still colors was like the screen right now very bad....but red was red,ect....so the selt test at my advice was ok.

    Comment

    • dskall
      Badcaps Legend
      • Oct 2016
      • 2905
      • usa

      #22
      Re: lg 50pa4500 picture very bad

      Maybe a picture of the screen with test pattern.
      I assume no responsibility for any stupid suggestions I might post.

      Comment

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

        #23
        Re: lg 50pa4500 picture very bad

        Normally Red is only bad if the Zsus erc ramp is not working or Ve is bad, have you checked Vsc on the Ysus ?
        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

        • tonytiger
          Senior Member
          • Jan 2010
          • 163
          • canada

          #24
          Re: lg 50pa4500 picture very bad

          hi again,i did some other test as you asked me like vsc on ysus, if my test was ok i did black probe on chassi ground and red at the + of vsc gave me a reading of jumping from 78v to 82v at vsc - jumping -86v to -89v............vy + jumping 120v to 124v and - jumping -86v to -89v......and im trying to put a small video here so you could see test partern since it is doing a partern on red,green,blue,white and some others black bars going on the screen and re-starting partern....so photos would be to hard taking them at the right time
          Attached Files
          Last edited by tonytiger; 03-03-2017, 03:55 AM.

          Comment

          • Davi.p
            Badcaps Legend
            • Sep 2009
            • 4266
            • Italy - Milan

            #25
            Re: lg 50pa4500 picture very bad

            Is strange that autotest lasts so few, i saw few colors, are you sure is the entire test? I saw that test only one time, if i remember the test is positive! (so bad mainboard?)

            Comment

            • Hamie
              Badcaps Legend
              • Apr 2014
              • 1383
              • UK

              #26
              Re: lg 50pa4500 picture very bad

              Originally posted by tonytiger
              hi again,i did some other test as you asked me like vsc on ysus, if my test was ok i did black probe on chassi ground and red at the + of vsc gave me a reading of jumping from 78v to 82v at vsc - jumping -86v to -89v............vy + jumping 120v to 124v and - jumping -86v to -89v......and im trying to put a small video here so you could see test partern since it is doing a partern on red,green,blue,white and some others black bars going on the screen and re-starting partern....so photos would be to hard taking them at the right time
              You need to measure vsc and -vy across the test points.

              Ie:

              black probe to -

              Red probe to +

              Comment

              • tonytiger
                Senior Member
                • Jan 2010
                • 163
                • canada

                #27
                Re: lg 50pa4500 picture very bad

                hi and sorry for delay,well the test is that long and it will re-start to the red,ect....as for the measurement that what i tought i was maybe doing it wrong so here is the resulte:

                vsc=151.3v
                -vy=190.5v

                and thanks for helping me.

                Comment

                • dick_barton
                  Badcaps Legend
                  • Aug 2015
                  • 6642
                  • Wales

                  #28
                  Re: lg 50pa4500 picture very bad

                  Those two voltages appear to match what is given in other threads
                  Vsc = 150V
                  Vy = -190V

                  Have you checked.
                  Vs = 205V
                  Va = 55V
                  Willing to help but I'm no expert.

                  Comment

                  • tonytiger
                    Senior Member
                    • Jan 2010
                    • 163
                    • canada

                    #29
                    Re: lg 50pa4500 picture very bad

                    yes the vs and va voltage also where check and good ......very stange still looking and testing every connection to see if there is a defference in image,but no luck for now...

                    Comment

                    • Davi.p
                      Badcaps Legend
                      • Sep 2009
                      • 4266
                      • Italy - Milan

                      #30
                      Re: lg 50pa4500 picture very bad

                      waiting for more experienced... why you don't tell the mainboard code?

                      Comment

                      • tonytiger
                        Senior Member
                        • Jan 2010
                        • 163
                        • canada

                        #31
                        Re: lg 50pa4500 picture very bad

                        sorry davi.p did not quite understand you question about mainboard code...is there something or someway i can test more the mainboard.to rule this one out....have no much more ideals on what to do or test...thank you.

                        Comment

                        • Davi.p
                          Badcaps Legend
                          • Sep 2009
                          • 4266
                          • Italy - Milan

                          #32
                          Re: lg 50pa4500 picture very bad

                          sorry for my english, i mean the model number of mainboard, or, better, shopjimmy pictures of back and front, is it Eax64696604? this?:
                          http://mgelectronicsrepairservice.co...BT62143602.jpg

                          Comment

                          • tonytiger
                            Senior Member
                            • Jan 2010
                            • 163
                            • canada

                            #33
                            Re: lg 50pa4500 picture very bad

                            not your english,just me that missed giving that number.here it is :eax64696607(1.0)pa/pk/pu/pd/pb23a

                            photo from shopjimmy but if you need mine let me know.

                            thank you very much for help me.
                            Attached Files

                            Comment

                            • Davi.p
                              Badcaps Legend
                              • Sep 2009
                              • 4266
                              • Italy - Milan

                              #34
                              Re: lg 50pa4500 picture very bad

                              My thought was incorrect.. i don't know where to point at...

                              Comment

                              • Hamie
                                Badcaps Legend
                                • Apr 2014
                                • 1383
                                • UK

                                #35
                                Re: lg 50pa4500 picture very bad

                                So what's your z-bias voltage?

                                Located on z-sus. Might be labelled VZB

                                Comment

                                • tonytiger
                                  Senior Member
                                  • Jan 2010
                                  • 163
                                  • canada

                                  #36
                                  Re: lg 50pa4500 picture very bad

                                  this is the board that i replace and i do have 129.7v on vzb.

                                  Comment

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