haier l37a8a-a1

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  • willyam1
    Senior Member
    • Feb 2012
    • 112
    • israel
    #1

    haier l37a8a-a1

    hi to all.
    problem is pic is ok for a few sec then freeze and then fic fade away slowly and then vertical lines in all the screen.
    i change the main board just in case no luck.
    some meserment in TCON vgh=16 vgl=-6v vcc=3.3v 1.5v in out reg .
    by scop can see signals in the input of the tcon cabel.
    i dismantale the screen and check the ribbon cabel all ok.
    is it screen or the TCON BOARD =6870C-0158A.
    THANKS WILLYAM1
    Tags: None
    • willyam1
      Senior Member
      • Feb 2012
      • 112
      • israel
      #2
      Re: haier l37a8a-a1FREEZE PIC

      [QUOTE=willyam1;384694]hi to all.
      problem is pic is ok for a few sec then freeze and then fic fade away slowly and then vertical lines in all the screen.
      i change the main board just in case no luck.
      some meserment in TCON vgh=16 vgl=-6v vcc=3.3v 1.5v in out reg .
      by scop can see signals in the input of the tcon cabel.
      i dismantale the screen and check the ribbon cabel all ok.
      is it screen or the TCON BOARD =6870C-0158A.
      vgh in scope showing a pulsses its semms to me that its not correct its sould be steady dc like vcc vgl vdd need to know wich ic supply that valltage is itTPS6561 OR RT8901 OR COULD BE A SMD CAPI OR DIODE.
      WILLYAM1

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK
          #3
          Re: haier l37a8a-a1

          Is VGH pulsing when pic OK?
          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

            • willyam1
              Senior Member
              • Feb 2012
              • 112
              • israel
              #4
              Re: haier l37a8a-a1

              yes its also pulsing when the pic is ok.the tv is conected to my laptop and when i change the page the last pic is shwoing but not the newone and slowly fade away.
              the vgh always with pulses.
              willyam

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK
                  #5
                  Re: haier l37a8a-a1

                  Can we see a picture of the t-con? Need to see if it has RAM memory.
                  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

                    • willyam1
                      Senior Member
                      • Feb 2012
                      • 112
                      • israel
                      #6
                      Re: haier l37a8a-a1

                      i will send pic tomorrow i think its vgot a ram memory

                        Comment

                        • willyam1
                          Senior Member
                          • Feb 2012
                          • 112
                          • israel
                          #7
                          Re: haier l37a8a-a1

                          any data on the chip RT8901

                            Comment

                            • willyam1
                              Senior Member
                              • Feb 2012
                              • 112
                              • israel
                              #8
                              Re: haier l37a8a-a1

                              solve.
                              i change the ic rt8901 now i got 24v pic ok.
                              willyam

                                Comment

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