Vestel 17PW26-4 V.1

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  • rafa805
    Member
    • Oct 2013
    • 19
    • Portugal

    #1

    Vestel 17PW26-4 V.1

    Hi all, so I had a friend who gave me a bad TV that is using this Vestel PS, and the TV is stuck at stand by, will not power.
    I took it a part and immediately saw a few bad capacitors, I replaced them all right away but no change.
    I've checked my output voltages, and the problem is 12V and 24V are 0, so i basically only have 5V and 3.3V.
    I've looked around in the forum for similar problems and checked everything I read that could be the issue but couldn't find anything.
    I've looked for shorts around the PFC controller chip, nothing there that I could find.
    All the diodes are ok, I couldn't find any shorts, so now I really don't know what else to check. To be honest I love electronics but unfortunately my troubleshooting skills need to be perfected and that's what I'm looking for, hope someone can help do just that.

    Thank you.
  • arizanotlari
    Senior Member
    • Nov 2014
    • 158
    • Turkiye

    #2
    Re: Vestel 17PW26-4 V.1

    Hi.
    what is mainboard name?
    https://www.badcaps.net

    Comment

    • rafa805
      Member
      • Oct 2013
      • 19
      • Portugal

      #3
      Re: Vestel 17PW26-4 V.1

      Originally posted by arizanotlari
      Hi.
      what is mainboard name?
      It's a Vestel 17MB36-2 (020309)

      Comment

      • arizanotlari
        Senior Member
        • Nov 2014
        • 158
        • Turkiye

        #4
        Re: Vestel 17PW26-4 V.1

        in standby mode, chassis activated only 5V and 3V3. try turn-on set via rc or local keys.
        if led not blinking or other voltages (12V&24V) not regulated, rewrite SPI.
        If led blinking or other voltages regulated but cut off suddenly, check capacitors of U121 U144. There may also be a short circuit on the chassis

        Diagram : https://yadi.sk/i/dCNi9uSatOpTCA
        https://www.badcaps.net

        Comment

        • rafa805
          Member
          • Oct 2013
          • 19
          • Portugal

          #5
          Re: Vestel 17PW26-4 V.1

          Originally posted by arizanotlari
          in standby mode, chassis activated only 5V and 3V3. try turn-on set via rc or local keys.
          if led not blinking or other voltages (12V&24V) not regulated, rewrite SPI.
          If led blinking or other voltages regulated but cut off suddenly, check capacitors of U121 U144. There may also be a short circuit on the chassis

          Diagram : https://yadi.sk/i/dCNi9uSatOpTCA
          According to what you're saying I should now rewrite the SPI, the problem is I do not know what that is and I don't know how to do that, can you elaborate please?

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Vestel 17PW26-4 V.1

            Can we see good clear straight shots pictures of the boards so we can see what we are dealing with?

            What is the power supply board number?
            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

            • SMDFlea
              Super Moderator
              • Jan 2018
              • 20807
              • UK

              #7
              Re: Vestel 17PW26-4 V.1

              vestel_17pw26-4 not sure if its the right one .
              Attached Files
              All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

              Comment

              • rafa805
                Member
                • Oct 2013
                • 19
                • Portugal

                #8
                Re: Vestel 17PW26-4 V.1

                Originally posted by budm
                Can we see good clear straight shots pictures of the boards so we can see what we are dealing with?

                What is the power supply board number?
                Sure, here they are.
                Attached Files
                Last edited by rafa805; 08-29-2020, 02:39 PM.

                Comment

                • rafa805
                  Member
                  • Oct 2013
                  • 19
                  • Portugal

                  #9
                  Re: Vestel 17PW26-4 V.1

                  Does anyone have any ideas?

                  Comment

                  • dick_barton
                    Badcaps Legend
                    • Aug 2015
                    • 6642
                    • Wales

                    #10
                    Re: Vestel 17PW26-4 V.1

                    With the mainboard disconnected from power supply jumper ST_BY to +5V using a 1K resistor. Then check for +12V & +24V.
                    Last edited by dick_barton; 08-31-2020, 12:45 PM.
                    Willing to help but I'm no expert.

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #11
                      Re: Vestel 17PW26-4 V.1

                      If the schematic in post #7 is matched to this power supply board, the ST_BY (PS-ON) is active low, so if you run the power supply board by itself without any pull-up resistors, all the switched power supplies output should be present.
                      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

                      • rafa805
                        Member
                        • Oct 2013
                        • 19
                        • Portugal

                        #12
                        Re: Vestel 17PW26-4 V.1

                        Originally posted by dick_barton
                        With the mainboard disconnected from power supply jumper ST_BY to +5V using a 1K resistor. Then check for +12V & +24V.
                        Well I can tell you that doing this in pins 11 and 12 I get 12.1V and in pin 26 I get 24.5V. what does this tell us? Main board issue?

                        Comment

                        • dick_barton
                          Badcaps Legend
                          • Aug 2015
                          • 6642
                          • Wales

                          #13
                          Re: Vestel 17PW26-4 V.1

                          So it looks like your power supply is working.
                          Last edited by dick_barton; 08-31-2020, 03:22 PM.
                          Willing to help but I'm no expert.

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #14
                            Re: Vestel 17PW26-4 V.1

                            Originally posted by rafa805
                            Well I can tell you that doing this in pins 11 and 12 I get 12.1V and in pin 26 I get 24.5V. what does this tell us? Main board issue?
                            If that is the case, then the switched power supplies section are working, but the schematic does not match your board.
                            If you have all the board connected back together, what DCV do yo have on the ST-BY (PS-ON) pin when TV is off and when TV is turned on?
                            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

                            • rafa805
                              Member
                              • Oct 2013
                              • 19
                              • Portugal

                              #15
                              Re: Vestel 17PW26-4 V.1

                              Let me rectify that. Those values where when I plugged the resistor between ST_BY and GND. Now I did it again but this time like you said the second time, between ST_BY and +5V and now I get 22.47 on pin 26, and on pins 11 and 12 it keeps changing constantly from 0 to around 5/6 volts, it almost feels like it's increasing and then suddendly it drops to 0.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: Vestel 17PW26-4 V.1

                                Originally posted by rafa805
                                Let me rectify that. Those values where when I plugged the resistor between ST_BY and GND. Now I did it again but this time like you said the second time, between ST_BY and +5V and now I get 22.47 on pin 26, and on pins 11 and 12 it keeps changing constantly from 0 to around 5/6 volts, it almost feels like it's increasing and then suddendly it drops to 0.
                                I am confused, so if you put the resistor between ST_BY and GND you will get steady output from all the switched power supplies, correct?

                                But if you put resistor between ST_BY and +5V then the switched power supplies output are not on steady, correct?
                                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

                                • rafa805
                                  Member
                                  • Oct 2013
                                  • 19
                                  • Portugal

                                  #17
                                  Re: Vestel 17PW26-4 V.1

                                  Originally posted by budm
                                  I am confused, so if you put the resistor between ST_BY and GND you will get steady output from all the switched power supplies, correct?

                                  But if you put resistor between ST_BY and +5V then the switched power supplies output are not on steady, correct?
                                  Precisely!

                                  With the resistor in ST_BY to GND in pins 11 and 12 I get 12.1V and in pin 26 I get 24.5V;

                                  With the resistor in ST_BY to +5V I get 22.47V on pin 26, and on pins 11 and 12 it keeps changing constantly from 0 to around 5/6 volts.

                                  Comment

                                  • dick_barton
                                    Badcaps Legend
                                    • Aug 2015
                                    • 6642
                                    • Wales

                                    #18
                                    Re: Vestel 17PW26-4 V.1

                                    If the supplies are correct when ST_BY is connected to ground then that will be correc way. I had it the wrong way round. So Budm has given the correct method for testing.


                                    Edit
                                    Found some notes I made in the past.
                                    Attached Files
                                    Last edited by dick_barton; 09-01-2020, 12:28 PM.
                                    Willing to help but I'm no expert.

                                    Comment

                                    • rafa805
                                      Member
                                      • Oct 2013
                                      • 19
                                      • Portugal

                                      #19
                                      Re: Vestel 17PW26-4 V.1

                                      Originally posted by dick_barton
                                      If the supplies are correct when ST_BY is connected to ground then that will be correc way. I had it the wrong way round. So Budm has given the correct method for testing.


                                      Edit
                                      Found some notes I made in the past.

                                      Yes I've checked again and the values are the same, but the TV does not power. The local keys are touch and I think they.might be working because they beep when I press, the remote control I don't know whether it's working or not. Is there a way I can jumper something to force her to boot up?

                                      Comment

                                      • dick_barton
                                        Badcaps Legend
                                        • Aug 2015
                                        • 6642
                                        • Wales

                                        #20
                                        Re: Vestel 17PW26-4 V.1

                                        Here is the schematic for your mainboard.
                                        I would check all the voltage regulators as shown on page 10 of 20 for the correct output voltages.
                                        Attached Files
                                        Last edited by dick_barton; 09-02-2020, 12:39 PM.
                                        Willing to help but I'm no expert.

                                        Comment

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