Vizio VS42L LCD displaying only black and white

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  • Cosmo66
    Senior Member
    • Nov 2012
    • 87
    • USA

    #1

    Vizio VS42L LCD displaying only black and white

    Does anyone know what could cause this condition? I'm thinking of picking up this TV, but I'm haggling with the guy a little. He says the picture just lost color and is suddenly grey and white. I was wondering if anyone has ever had this problem before? A google search didn't really yield any useful information, and I'd like to have a general idea of what I'm getting into before make a decision

    Is this a most likely a TCON failure?

    Any help would be appreciated, thanks!
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Vizio VS42L LCD displaying only black and white

    If he's using analog cable that could be a fault with the colour-burst decoding.
    If the menu's OK, it's the main for sure, otherwise it could be main or t-con.
    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

    • Cosmo66
      Senior Member
      • Nov 2012
      • 87
      • USA

      #3
      Re: Vizio VS42L LCD displaying only black and white

      On the main, do you think would most likely be a faulty chip?

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Vizio VS42L LCD displaying only black and white

        I have no idea. Either way, tracing the problem would mean oscilloscope and careful signal analysis. Easier to replace the board.
        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

        • Cosmo66
          Senior Member
          • Nov 2012
          • 87
          • USA

          #5
          Re: Vizio VS42L LCD displaying only black and white

          So, most likely I'll be changing either the TCON, or the main board,

          unless the guy's wife or kids messed up the color settings on the menu and he has no idea

          He won't take anything less than $75. Normally I'd pass, I refuse to spend more than $50 for a not working tv, but I have another Vizio that's almost identical. It would be nice to be able to swap boards back and forth.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK

            #6
            Re: Vizio VS42L LCD displaying only black and white

            I'd normally pay no more than £50/$80US for a faulty 42", I usually pay around £40, that is a good price you have there.
            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

            • Cosmo66
              Senior Member
              • Nov 2012
              • 87
              • USA

              #7
              Re: Vizio VS42L LCD displaying only black and white

              I picked up the TV. Here is what the picture looks like.
              Attached Files

              Comment

              • johnboy1313
                Badcaps Legend
                • Nov 2012
                • 1959
                • USA

                #8
                Re: Vizio VS42L LCD displaying only black and white

                I'm going public and putting my money on T-Con.

                Comment

                • Cosmo66
                  Senior Member
                  • Nov 2012
                  • 87
                  • USA

                  #9
                  Re: Vizio VS42L LCD displaying only black and white

                  I have another Vizio, the exact same model, with a ribbon cable issue. Tomorrow I'll swap out the boards and find the culprit.

                  I also have the luxury of being able to use the good board as a reference to try and troubleshoot down to component level. Should be a hoot!

                  Comment

                  • tom66
                    EVs Rule
                    • Apr 2011
                    • 32560
                    • UK

                    #10
                    Re: Vizio VS42L LCD displaying only black and white

                    It looks like t-con to me. Menus good/bad? On HDMI is good/bad?
                    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

                    • Cosmo66
                      Senior Member
                      • Nov 2012
                      • 87
                      • USA

                      #11
                      Re: Vizio VS42L LCD displaying only black and white

                      I replaced the tcon. Problem solved. I'm gonna try to troubleshoot the board down to the component. Wish me luck. . .

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: Vizio VS42L LCD displaying only black and white

                        My bet would be it's in the large IC. Good luck with that...
                        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

                        • Cosmo66
                          Senior Member
                          • Nov 2012
                          • 87
                          • USA

                          #13
                          Re: Vizio VS42L LCD displaying only black and white

                          By the way, thank you tom66. I was gonna pass on this until you made me realize $75 wasn't bad. Good call

                          Comment

                          • Cosmo66
                            Senior Member
                            • Nov 2012
                            • 87
                            • USA

                            #14
                            Re: Vizio VS42L LCD displaying only black and white

                            Originally posted by tom66
                            My bet would be it's in the large IC. Good luck with that...
                            I think you may be correct. I checked every component I could put a probe to, using the good board I have as reference, and couldn't find a single problem. The large IC gets very hot with the TV on.

                            There's really not much else to fail on that board. Maybe I'll drown the thing in flux and take a heat gun to it as a final measure. It's a BGA chip with at least 100 pins, I wouldn't be shocked if at least one of those pins is open.
                            Last edited by Cosmo66; 12-13-2012, 01:38 AM.

                            Comment

                            • Dgtech
                              E. Technician
                              • Apr 2009
                              • 1462
                              • Steeler

                              #15
                              Re: Vizio VS42L LCD displaying only black and white

                              If the large chip got hot to the touch, most likely it's damaged. Not really worth your time in trying to fix it.
                              The strong-minded rise to the challenge of their goals,the weak-minded BECOME HATERS

                              Comment

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