Vizio VX42LHDTV10A stuck in standby after going haywire.

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  • Jasgriff
    Badcaps Veteran
    • Feb 2012
    • 578
    • UK

    #21
    Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

    Ok because your AMC1117's dont have a number after them then it means that they are adjustable regulators. This means that the voltage out on pin 2 is determined by what's going on at pin 1.

    If you look on the diagram on page 6 you can see an example of this on the top left.
    Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

    How to resize your pictures guide click HERE
    Retiredcaps Ideal post example click HERE

    Comment

    • Jasgriff
      Badcaps Veteran
      • Feb 2012
      • 578
      • UK

      #22
      Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

      So we need to know what the value of those 2 small resistors are. Can you read them?
      Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

      How to resize your pictures guide click HERE
      Retiredcaps Ideal post example click HERE

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #23
        Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

        When there are two network resistors connected to the ADJ pin of the regulator, then it is the Adjustable type regulator. As Jasgriff explained, it iS 1117-18, then it will be fixed voltage regultor with 1.8v out put, and pin 1 will be tie to Ground. If it just 1117 without any number follows it and it has two resisotrs connected to pin 1, then it is an Adjustable regulator, the out put voltage is set by the value of those two resistors.
        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

        • ktulu909
          Member
          • Mar 2012
          • 40
          • USA

          #24
          Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

          Reading the resistors isnt an option.They are about as small as small gets and I have 20-12 vision.I would bet theres no writing on them at all.

          Their locations are R50 and R51.A service manual would be perfect about now.

          I put a meter on them for kicks and I cant get a reading on r50 at all.R51 is reading about 2.6 ohms.

          Comment

          • ktulu909
            Member
            • Mar 2012
            • 40
            • USA

            #25
            Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

            Take that back,R50 is reading 98 ohms now.I dont think i had it probed properly.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

              Since we are checking U7 which the reading does not look right at all, what do you see when you Ohm out Pin 2 to Ground, it may be that there are heavy load on pin 2 that it pulls the U7 output low.
              By the way, can we see real good closed up pictures of U7 and the connections around it?
              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

              • ktulu909
                Member
                • Mar 2012
                • 40
                • USA

                #27
                Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                95.8 ohms

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #28
                  Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                  One of those two resistor will have one end connectoed to ground and another end is hooked up to pin 1, what value is that one, then other one will have one end also connected to pin1 and another end will be hook up to Pin2 (Vout). If we know the value of these two resistors then we can calculate what the output voltage should be.
                  Please remebertaht we are trying to do long distant troubleshooting here, good information and pictures are a great help. Jasgriff gave me great pictures and information to trace out his circuits.
                  Last edited by budm; 03-20-2012, 04:56 PM.
                  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

                  • ktulu909
                    Member
                    • Mar 2012
                    • 40
                    • USA

                    #29
                    Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                    Ok,heres the pic.I need to reread your post to make sure Im metering the right thing lol
                    Attached Files

                    Comment

                    • ktulu909
                      Member
                      • Mar 2012
                      • 40
                      • USA

                      #30
                      Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                      Ok R50 is what I believe is the one to ground.It is reading 98 ohms
                      R51 is the one that is reading 2.5-2.6 ohms.

                      Comment

                      • Jasgriff
                        Badcaps Veteran
                        • Feb 2012
                        • 578
                        • UK

                        #31
                        Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                        R51 is ground and R50 is to pin2 out by the looks of it on ur pic.
                        Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                        How to resize your pictures guide click HERE
                        Retiredcaps Ideal post example click HERE

                        Comment

                        • ktulu909
                          Member
                          • Mar 2012
                          • 40
                          • USA

                          #32
                          Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                          That very well may be the case gah.Im sorry,like I said im a newbie. I think you are correct after a friendly little continuity check

                          Comment

                          • Jasgriff
                            Badcaps Veteran
                            • Feb 2012
                            • 578
                            • UK

                            #33
                            Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                            Thats ok thats why the pics help. its easy when you see where the capacitors negative pin is.
                            Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                            How to resize your pictures guide click HERE
                            Retiredcaps Ideal post example click HERE

                            Comment

                            • ktulu909
                              Member
                              • Mar 2012
                              • 40
                              • USA

                              #34
                              Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                              hehehehe,yea,I guess that would be a dead givaway huh.

                              Comment

                              • Jasgriff
                                Badcaps Veteran
                                • Feb 2012
                                • 578
                                • UK

                                #35
                                Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                                Right I think that your should be getting around 1.28v out of that regulator. based on the readings that you have proved. However I may be corrected by the next person who tries to work it out.
                                Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                How to resize your pictures guide click HERE
                                Retiredcaps Ideal post example click HERE

                                Comment

                                • ktulu909
                                  Member
                                  • Mar 2012
                                  • 40
                                  • USA

                                  #36
                                  Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                                  I sure hope its the regulator.It sure would be a heck of a lot easier to unsolder and replace with the regular iron I have.

                                  Comment

                                  • Jasgriff
                                    Badcaps Veteran
                                    • Feb 2012
                                    • 578
                                    • UK

                                    #37
                                    Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                                    Yeah I think it definately doesnt seem right! I would have thought it would be set to provide 1.8v out but either way I think it needs changing. They are not to expensive to change and eliminate it from your fault finding.

                                    It might even be worth you tracing where the out pin goes too. that will give you an idea of what it should be powering.
                                    Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                    How to resize your pictures guide click HERE
                                    Retiredcaps Ideal post example click HERE

                                    Comment

                                    • ktulu909
                                      Member
                                      • Mar 2012
                                      • 40
                                      • USA

                                      #38
                                      Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                                      The suspense is killing me lmao.

                                      Comment

                                      • Jasgriff
                                        Badcaps Veteran
                                        • Feb 2012
                                        • 578
                                        • UK

                                        #39
                                        Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                                        Have you ordered one? did you trace where the out pin goes too?
                                        Fixed so far : 1 Home cinema system, 16 LCD Monitors, 4 LCD TV's

                                        How to resize your pictures guide click HERE
                                        Retiredcaps Ideal post example click HERE

                                        Comment

                                        • ktulu909
                                          Member
                                          • Mar 2012
                                          • 40
                                          • USA

                                          #40
                                          Re: Vizio VX42LHDTV10A stuck in standby after going haywire.

                                          Originally posted by Jasgriff

                                          It might even be worth you tracing where the out pin goes too. that will give you an idea of what it should be powering.
                                          Ok,I might be loosing my mind,but it doesnt appear to me to go anywhere lol

                                          Comment

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