Help- Vizio VW42L HDTV10A

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  • XmouseX
    Senior Member
    • Aug 2011
    • 158
    • US
    #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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      • retiredcaps
        Badcaps Legend
        • Apr 2010
        • 9271
        #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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          • retiredcaps
            Badcaps Legend
            • Apr 2010
            • 9271
            #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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              • XmouseX
                Senior Member
                • Aug 2011
                • 158
                • US
                #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.

                  Comment

                  • retiredcaps
                    Badcaps Legend
                    • Apr 2010
                    • 9271
                    #25
                    Re: Help- Vizio VW42L HDTV10A

                    Did you see post #23?
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                      • retiredcaps
                        Badcaps Legend
                        • Apr 2010
                        • 9271
                        #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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                          • XmouseX
                            Senior Member
                            • Aug 2011
                            • 158
                            • US
                            #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.

                              Comment

                              • retiredcaps
                                Badcaps Legend
                                • Apr 2010
                                • 9271
                                #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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                                  • retiredcaps
                                    Badcaps Legend
                                    • Apr 2010
                                    • 9271
                                    #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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                                      • XmouseX
                                        Senior Member
                                        • Aug 2011
                                        • 158
                                        • US
                                        #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

                                          • retiredcaps
                                            Badcaps Legend
                                            • Apr 2010
                                            • 9271
                                            #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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                                              • XmouseX
                                                Senior Member
                                                • Aug 2011
                                                • 158
                                                • US
                                                #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

                                                  Comment

                                                  • XmouseX
                                                    Senior Member
                                                    • Aug 2011
                                                    • 158
                                                    • US
                                                    #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

                                                      • retiredcaps
                                                        Badcaps Legend
                                                        • Apr 2010
                                                        • 9271
                                                        #34
                                                        Re: Help- Vizio VW42L HDTV10A

                                                        Originally posted by XmouseX
                                                        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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                                                          • XmouseX
                                                            Senior Member
                                                            • Aug 2011
                                                            • 158
                                                            • US
                                                            #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.

                                                              Comment

                                                              • retiredcaps
                                                                Badcaps Legend
                                                                • Apr 2010
                                                                • 9271
                                                                #36
                                                                Re: Help- Vizio VW42L HDTV10A

                                                                Originally posted by XmouseX
                                                                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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                                                                  • retiredcaps
                                                                    Badcaps Legend
                                                                    • Apr 2010
                                                                    • 9271
                                                                    #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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                                                                      • retiredcaps
                                                                        Badcaps Legend
                                                                        • Apr 2010
                                                                        • 9271
                                                                        #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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                                                                          • XmouseX
                                                                            Senior Member
                                                                            • Aug 2011
                                                                            • 158
                                                                            • US
                                                                            #39
                                                                            Re: Help- Vizio VW42L HDTV10A

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

                                                                              Comment

                                                                              • retiredcaps
                                                                                Badcaps Legend
                                                                                • Apr 2010
                                                                                • 9271
                                                                                #40
                                                                                Re: Help- Vizio VW42L HDTV10A

                                                                                Originally posted by XmouseX
                                                                                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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