42" Spectrincq no power

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  • avaktech
    Senior Member
    • Jan 2012
    • 68
    • US

    #1

    42" Spectrincq no power

    Rescued an off brand 42" LCD tv from a local landfill today. Going through power supply and found an open fuse and a couple bulging caps. Tv does not power on at all, no light, nothing. Only thing possibly fishy is a closed 400v polyester foil capacitor. I am very inexperienced so can someone with knowledge tell me if these types of capacitors would normally appear shorted? If it is a problem what else should I check? Thanks
    avaktech is offline Reply With Quote
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: 42" Spectrincq no power

    Please post good clear pictures of all the boards so we can see how they are connected, pictures of the cap? Please use attachment function to post the pictures.
    We are trying to troubleshoot the problem without having the boards in front of us, so good clear pictures are very important.
    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

    • selldoor
      Slow Learner
      • Dec 2010
      • 7870

      #3
      Re: 42" Spectrincq no power

      ]per other thread

      Also found these two resistors both look fully closed, does anyone wanna chime in on the value for these?
      Attached Images
      Reply With Quote
      Old Today, 04:05 AM #3
      selldoor

      There is no need to start multiple threads with the same question - let this one die and use the main one.
      Resistor values - why not look them up yourself?
      Type hobby hour resistor into your search engine.

      avaktech
      New Member

      Join Date: Jan 2012[
      Posts: 18

      I noticed the tv repair threads and decided to move over there. Not trying to be pushy, sorry. And yes I did look up the colors on multiple charts and calculators but none of the showed silver or gold in the positions of the ones I pictured. I am guessing they are just fusibles but dont really know.

      Dont look like fusibles.
      OK see attached - please can you update profile with country and mains voltage
      Attached Files
      Please upload pictures using attachment function when ask for help on the repair
      http://www.badcaps.net/forum/showthread.php?t=39740

      Comment

      • avaktech
        Senior Member
        • Jan 2012
        • 68
        • US

        #4
        Re: 42" Spectrincq no power

        I noticed a repair kit online for the board:ad301m24-4n1 I ran a few tests at these locations but am not very experienced so not sure what I'm doing exactly.. The SMD resistors all seems within spec. There is some sort of controller in the kit and the small heatsink attached to it has come loose so it is suspect, however I have no idea how to test it?

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #5
          Re: 42" Spectrincq no power

          PICTURES!! Or we can't help you locate things!
          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

          • selldoor
            Slow Learner
            • Dec 2010
            • 7870

            #6
            Re: 42" Spectrincq no power

            Budm is the man for that - as he says we will need clear pictures - might help if you post a link to the kit.
            Please upload pictures using attachment function when ask for help on the repair
            http://www.badcaps.net/forum/showthread.php?t=39740

            Comment

            • avaktech
              Senior Member
              • Jan 2012
              • 68
              • US

              #7
              Re: 42" Spectrincq no power

              Alright guys here's some pics, not the greatest
              Attached Files

              Comment

              • avaktech
                Senior Member
                • Jan 2012
                • 68
                • US

                #8
                Re: 42" Spectrincq no power

                Here's another with the other sink cover removed, I'm having a hard time getting the lighting right.
                Attached Files

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: 42" Spectrincq no power

                  I can see some caps with domed tops. This power supply looks familiar, I think TOM have seen this before in VESTEL?
                  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

                  • avaktech
                    Senior Member
                    • Jan 2012
                    • 68
                    • US

                    #10
                    Re: 42" Spectrincq no power

                    There is definately bad caps, several, however the main fuse is open so i am trying to be cautious. I don't wanna do more damage by just doing the caps. I haven't been able to find a glaring fault yet. Thats why I was asking about the 400 volt poly foil cap, it seems shorted is this normal?

                    Comment

                    • selldoor
                      Slow Learner
                      • Dec 2010
                      • 7870

                      #11
                      Re: 42" Spectrincq no power

                      Ok good pics - looks like c64 is bulged and possibly the Big cap? may be just the camera angle.

                      Can you locate and test the bridge rectifier, I think I see it in Pic 2 on the heatsink
                      behind the yellow box with RGA404C182324 on it.





                      Bridge rectifier test

                      a) put your multimeter in diode test mode
                      b) put your red lead on plus + pin side and the red lead on adjacent ~ pin - record reading
                      c) reverse the leads - recording reading


                      Then repeat the test on the other two pins

                      b) put your black lead on negative - pin side and the red lead on adjacent ~ pin - record reading
                      c) reverse the leads - recording reading

                      Then repeat the test on the middle two pins
                      Please upload pictures using attachment function when ask for help on the repair
                      http://www.badcaps.net/forum/showthread.php?t=39740

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: 42" Spectrincq no power

                        Where is the pictures of this FOIL cap?
                        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

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK

                          #13
                          Re: 42" Spectrincq no power

                          Originally posted by budm
                          I can see some caps with domed tops. This power supply looks familiar, I think TOM have seen this before in VESTEL?
                          This PSU looks similar, but not identical, to the one used in certain Lexsor and Polaroid TVs - a Harwa PSU. But it is different, so it might not be identical. Mine had several bad caps too.
                          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

                          • multimeter
                            Badcaps Veteran
                            • Jan 2011
                            • 739
                            • united kingdom

                            #14
                            Re: 42" Spectrincq no power

                            looks like samxon GF's on the outputs,rip em out !
                            fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

                            ----------------------------------------------
                            please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

                            Comment

                            • avaktech
                              Senior Member
                              • Jan 2012
                              • 68
                              • US

                              #15
                              Re: 42" Spectrincq no power

                              Foil cap is bottom right on pic 238.

                              On the left you can see on the 120 connector one of the pins got burned up a bit.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: 42" Spectrincq no power

                                That green cap C44? Do you have the value as printed on the body? It is used for snubber circuits and they do go bad due to exposing to high kick back voltage from the transformer, if it goes out, the MOSFET that drive the transformer will be damaged and it can take out the SMPS IC with it also. May be that is why the fuse blown due to BACK EMF of the transformer. You should remove it from the board and see if the body has crack or bulging out to the side. You should also see if it has leakage resistance.
                                See example:
                                http://s807.photobucket.com/albums/y...nt=badcap1.jpg
                                Attached Files
                                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

                                • avaktech
                                  Senior Member
                                  • Jan 2012
                                  • 68
                                  • US

                                  #17
                                  Re: 42" Spectrincq no power

                                  Well c44 seems to be nearly open, can get reading in diode mode. How do I test the SMPS? Is that this part?:TNY266PN It is included in the repair kit so I'm guessing its common for it to go.

                                  Comment

                                  • avaktech
                                    Senior Member
                                    • Jan 2012
                                    • 68
                                    • US

                                    #18
                                    Re: 42" Spectrincq no power

                                    c44 is 47uf 25v electrolytic.

                                    Comment

                                    • avaktech
                                      Senior Member
                                      • Jan 2012
                                      • 68
                                      • US

                                      #19
                                      Re: 42" Spectrincq no power

                                      Budm where you asking about the foil cap at c3? above c44? If thats the case it has nearly no resistance. It looks just like the one in your pic but its a different color. I think its a 105j400v

                                      Comment

                                      • budm
                                        Badcaps Legend
                                        • Feb 2010
                                        • 40746
                                        • USA

                                        #20
                                        Re: 42" Spectrincq no power

                                        No, C44 is the green polyester cap at the bottom right corner of the board as you have said in pic238, see post 15. Isn't that c44 you are talking about?
                                        in post1 " Only thing possibly fishy is a closed 400v polyester foil capacitor"
                                        Attached Files
                                        Last edited by budm; 08-14-2012, 11:37 AM.
                                        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

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