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Help- Vizio VW42L HDTV10A

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    #21
    Re: Help- Vizio VW42L HDTV10A

    Ok so here are some more pics. the full back of the tv, the main control board, the tcon cable and the tcon cable + input power from power board(white wires).






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      #22
      Re: Help- Vizio VW42L HDTV10A

      1) On the main board, are fuses F1 and F2 good?

      2) You mentioned that all the voltage regulators tested good in post #1. I'm assuming you meant all the voltage regulators on the main board like the infamous U33 and U7?
      Last edited by retiredcaps; 06-26-2012, 10:09 PM.
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        #23
        Re: Help- Vizio VW42L HDTV10A

        3) What is part number U32 on the main board?

        4) I forgot to award you one retiredcaps' bonus point for a picture of your Greenlee multimeter. I can't quite make out the model number, but I know I have seen pictures of it before.
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          #24
          Re: Help- Vizio VW42L HDTV10A

          Yes sir U33 was 3.3V exactly , U7 was 1.27V and U9 was 1.53V. Also I checked F1 and F2. Both were 00.2 ohms and seemed fine.

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            #25
            Re: Help- Vizio VW42L HDTV10A

            Did you see post #23?
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              #26
              Re: Help- Vizio VW42L HDTV10A

              Service manual is at



              It does have a troubleshooting section. Maybe verify you did all the steps?
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                #27
                Re: Help- Vizio VW42L HDTV10A

                Thank you so much for your time I do have the manual already. I am just not sure how the flow chart works when it says how is the inverter?...Um it doesn't work..lol. But it doesnt give you a next step after that. Well thank you for all the help anyway.

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                  #28
                  Re: Help- Vizio VW42L HDTV10A

                  Focus on page 9-5. Test everything on that page inside the rectangular box. Report your findings for each box.
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                    #29
                    Re: Help- Vizio VW42L HDTV10A

                    I have more suggestion. Disconnect the LVDS cable from the main board. Now measure the DC voltage of LVDS pins 1, 2, 3, and 4 on the main board with respect to ground. Do you get voltage on any of them?
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                      #30
                      Re: Help- Vizio VW42L HDTV10A

                      Dont know if this matters, bu I just jumped 5V to pin 13 on J1 and the backlight came on....I will do the tests that you suggested. Thank you

                      Comment

                        #31
                        Re: Help- Vizio VW42L HDTV10A

                        Another suggestion. Please retest all the voltage regulators on the main board and list the pcb designation, part number, and readings for each pin like so

                        U33
                        AL1117-33
                        pin 1 = 0.0
                        pin 2 = 3.3
                        pin 3 = 5.0

                        Maybe we can spot something you missed?
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                          #32
                          Re: Help- Vizio VW42L HDTV10A

                          Ok so real quick I am still testing regulators, but the Voltage reading for the LVDS cable pinouts were...pin1=0V, Pin2=0V, pin3=2.4V and pin4=3.3V

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                            #33
                            Re: Help- Vizio VW42L HDTV10A

                            U33
                            AMC1117
                            pin1 - 2V
                            pin2 - 3.3V
                            pin3 - 5V

                            U7
                            AMC1117
                            pin1 - 0V
                            pin2 - 1.28V
                            pin3 - 3.3V

                            U9
                            AMC1117
                            pin1 - 0V
                            pin2 - 1.51V
                            pin3 - 3.3V

                            U8
                            AMC1117
                            pin1 - 2.05V
                            pin2 - 3.3V
                            pin3 - 5.15V

                            U2
                            AMC1117
                            pin1 - 1.45V
                            pin2 - 2.30V
                            pin3 - 5.10V

                            hope this helps

                            Comment

                              #34
                              Re: Help- Vizio VW42L HDTV10A

                              Originally posted by XmouseX View Post
                              U9
                              AMC1117
                              pin1 - 0V
                              pin2 - 1.51V
                              pin3 - 3.3V


                              U2
                              AMC1117
                              pin1 - 1.45V
                              pin2 - 2.30V
                              pin3 - 5.10V
                              1) Are you sure about the part numbers for U9 and U2? In the picture, it looks like U9 is K1117S15? The 15 at the end indicates it is a fixed regulator outputting 1.5V which would make U9 a good regulator.

                              Please re-check all your part numbers and make sure it is not a cut&paste error.

                              2) U2 is an adjustable voltage regulator and it is bad. Pin 2 should be pin 1 + 1.25V or 1.45 + 1.25 = 2.70V. At 2.30, it is way too low.
                              Last edited by retiredcaps; 06-26-2012, 11:37 PM.
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                                #35
                                Re: Help- Vizio VW42L HDTV10A

                                Yes those are the part numbers. The U9 that I mentioned earlier is on the TCON board. This U9 is on the main control board in the second set of pictures. It is confusing that there is 2 U9's.

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                                  #36
                                  Re: Help- Vizio VW42L HDTV10A

                                  Originally posted by XmouseX View Post
                                  Yes those are the part numbers.
                                  Not according to the pictures (which is why we ask for them - selldoor can back me up on this one).

                                  U9 on the main board is K1117S15. U9 on the t-con is RT9164A.

                                  U2 is bad. 52 cents at digikey.com

                                  http://www.digikey.com/product-detai...ICT-ND/1301524
                                  Last edited by retiredcaps; 06-26-2012, 11:54 PM.
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                                    #37
                                    Re: Help- Vizio VW42L HDTV10A

                                    To hedge my bets, the caps around U2 could be bad as well. Namely CE5, CE6, and others in that area. See post #38 below.
                                    Last edited by retiredcaps; 06-26-2012, 11:59 PM.
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                                      #38
                                      Re: Help- Vizio VW42L HDTV10A

                                      By the way, on page 9-5 on the service manual, it suggests that U2 should be 3.3V output.

                                      So pin 1 should be roughly 2.05V. Pin 1 + 1.25 = 3.30 for pin 2. So it is possible that the components feeding pin 1 are low or U2 itself is bad.
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                                        #39
                                        Re: Help- Vizio VW42L HDTV10A

                                        My bad! you are are correct my friend. It is a K1117.

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                                          #40
                                          Re: Help- Vizio VW42L HDTV10A

                                          Originally posted by XmouseX View Post
                                          My bad! you are are correct my friend. It is a K1117.
                                          Precision matters here. It is K1117S15. The S15 matters because it tells us the correct output voltage (1.5V). K1117 by itself suggests an adjustable regulator. So if pin 1 is 0 and pin 2 is 1.50, that means it is a bad regulator.
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