Viewsonic vp2013b flickering screen

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  • belippy
    Senior Member
    • Apr 2012
    • 50
    • canada

    #1

    Viewsonic vp2013b flickering screen

    I have already tried to change a few caps on the main board, but the problem is still there.

    Will the problem be the main board or the power board?

    Is there a way to find out this kind of problem?

    Thanks













    Attached Files
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Viewsonic vp2013b flickering screen

    It looks more like a T-con board problem. On smaller LCDs this is not replacable, yours might be an exception. The T-con is attached directly to the LCD panel and is usually at the top of the display.
    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

    • belippy
      Senior Member
      • Apr 2012
      • 50
      • canada

      #3
      Re: Viewsonic vp2013b flickering screen

      Can a t-con board be replaced?

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #4
        Re: Viewsonic vp2013b flickering screen

        Just to be sure, check the voltages on the 3-pin regulator IC's (I see 3 on the board) on the signal processing board (the board where you plug in the VGA cable) also. Also try heating up the T-CON board and the signal baord with hair dryer to see if the symptom changed.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • belippy
          Senior Member
          • Apr 2012
          • 50
          • canada

          #5
          Re: Viewsonic vp2013b flickering screen

          I have tried to heat up the both board with a hair dryer and result stayed the same.

          Checked the 3 regulators with following result:

          Part number 1084-0544AL (located at u20 on the signal board)
          pin 3 = 4.92
          pin 2 = 1.81
          pin 1 = 0.56

          Part number 1084-0544AL (located at u16 on the signal board)
          Pin 3 = 4.92
          pin 2 = 3.33
          pin 1 = 2.07

          Part number LD1117-c550 (Located top center on signal board)
          Pin 3 = 4.94
          Pin 2 = 2.51
          Pin 1 = 1.26

          power was on when I test them.
          Last edited by belippy; 04-26-2012, 07:45 PM.

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Viewsonic vp2013b flickering screen

            OK, the regulators outputs are good.
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • belippy
              Senior Member
              • Apr 2012
              • 50
              • canada

              #7
              Re: Viewsonic vp2013b flickering screen

              Last thing will be the T-con board.

              Comment

              • belippy
                Senior Member
                • Apr 2012
                • 50
                • canada

                #8
                Re: Viewsonic vp2013b flickering screen

                One thing i'm confused. The two regulators (u16 & u20) have the same model.
                But their output are so different!

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Viewsonic vp2013b flickering screen

                  They may be adjustable regulators, the output voltage is set by the resistor network on one of the pin.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment

                  • t.j.
                    Badcaps Veteran
                    • Apr 2010
                    • 383
                    • canada

                    #10
                    Re: Viewsonic vp2013b flickering screen

                    have you tries a differ monitor on comp to make sure it not vid card?

                    Comment

                    • belippy
                      Senior Member
                      • Apr 2012
                      • 50
                      • canada

                      #11
                      Re: Viewsonic vp2013b flickering screen

                      Originally posted by t.j.
                      have you tries a differ monitor on comp to make sure it not vid card?
                      I have 3 of the same monitor, only this one acting like this!

                      Comment

                      • belippy
                        Senior Member
                        • Apr 2012
                        • 50
                        • canada

                        #12
                        Re: Viewsonic vp2013b flickering screen

                        Originally posted by budm
                        They may be adjustable regulators, the output voltage is set by the resistor network on one of the pin.
                        Thanks, budm.

                        Are there anything I should check before I buy a new T-con board?
                        Last edited by belippy; 04-26-2012, 10:41 PM.

                        Comment

                        • t.j.
                          Badcaps Veteran
                          • Apr 2010
                          • 383
                          • canada

                          #13
                          Re: Viewsonic vp2013b flickering screen

                          had to ask!
                          peace

                          Comment

                          • belippy
                            Senior Member
                            • Apr 2012
                            • 50
                            • canada

                            #14
                            Re: Viewsonic vp2013b flickering screen

                            Originally posted by t.j.
                            had to ask!
                            peace
                            sorry t.j.

                            not meant to make you mad

                            problem with my english and my communication's skill....

                            I should have said it in a better manner, I will pay more attention in the future. sorry again!

                            Comment

                            • t.j.
                              Badcaps Veteran
                              • Apr 2010
                              • 383
                              • canada

                              #15
                              Re: Viewsonic vp2013b flickering screen

                              not mad! all good! have to check everything! good luck!
                              peace

                              Comment

                              • belippy
                                Senior Member
                                • Apr 2012
                                • 50
                                • canada

                                #16
                                Re: Viewsonic vp2013b flickering screen

                                I tried to reflow the chip on the T-con, but the screen has same distorted graphic.

                                sorry about the quality of an iphone!

                                Attached Files

                                Comment

                                • belippy
                                  Senior Member
                                  • Apr 2012
                                  • 50
                                  • canada

                                  #17
                                  Re: Viewsonic vp2013b flickering screen

                                  ok, I already bought 2 new T-con boards. Nothing has improved.

                                  After I install the first T-con, it's even worst.

                                  And recently I've order a new one from some where else. Not much of a difference.

                                  What else could it be?

                                  Comment

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