Technika LCD40HD 17PW16 Blown Up

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  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain
    #1

    Technika LCD40HD 17PW16 Blown Up

    Picked this up for £20 comes with stand, fault is no power what so ever, no standby nothing. Its a older Vestel chassis with by the looks of it a 17PW16-1 Psu so probably something on that is blown.

    I have had the exact same Tv before which had blew the Pfc mosfet and Ic causing no standby, wander if its the same issue ? Never know with these Vetsels. This thing is also crammed with dust so will need a good clean more to follow.

    TBC
    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

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    • ReeceyBurger123
      Never Give Up !
      • May 2014
      • 7325
      • Britain
      #2
      Re: Technika LCD40HD 17PW16 Blown Up

      Right making some good progress here, however now stumped on something as I have been before. I the fault was on the Pfc side of things however the mosfet and Ic were fine. The ceremic cap C920 was blown up not too sure on its value but I have a spare 17pw15 which I took the cap off this cap goes into the source pin of the Pfc mosfet. After replacing it the set now comes into standby with out blowing the fuse

      Its still not properly working though, the standby light comes on and pressing the power button it goes dim but the backlights or Tv doesn't start. I have found that the Pfc is low and not running, everything tests fine but no Pfc buck voltage. I have also checked for cold solder joints and all are good. I have had units like this before with the Pfc not working. Any ideas ?
      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

      https://www.facebook.com/Telford-Tel...7894576335359/

        Comment

        • ReeceyBurger123
          Never Give Up !
          • May 2014
          • 7325
          • Britain
          #3
          Re: Technika LCD40HD 17PW16 Blown Up

          Well im truly stuck on this, as usual when it comes to this fault on these. I have replace a few of these with low Pfc fault never been able to solve them others have not been able to either. Might as well wait until I get a OS scope then will try and track this one down.
          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

          https://www.facebook.com/Telford-Tel...7894576335359/

            Comment

            • Alastair E
              Chief Womble
              • Mar 2013
              • 1963
              • U.K.
              #4
              Re: Technika LCD40HD 17PW16 Blown Up

              PFC Chip or MOSFET.....?

              I had one with that blue ceramic cap blown apart and fuse shattered.

              Just replaced 'em both,--set worked. Cap is 220pF 1Kv as I recall...
              Last edited by Alastair E; 12-16-2015, 05:24 PM.
              TELEFIX

              How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
              http://www.irf.com/technical-info/appnotes/an-1088.pdf
              PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

                Comment

                • finntricky
                  Badcaps Veteran
                  • Jan 2014
                  • 449
                  • uk
                  #5
                  Re: Technika LCD40HD 17PW16 Blown Up

                  try this, i have a few of these and this was the fault, https://www.youtube.com/watch?v=q-fEpxAlmO0

                    Comment

                    • ReeceyBurger123
                      Never Give Up !
                      • May 2014
                      • 7325
                      • Britain
                      #6
                      Re: Technika LCD40HD 17PW16 Blown Up

                      Originally posted by Alastair E
                      PFC Chip or MOSFET.....?

                      I had one with that blue ceramic cap blown apart and fuse shattered.

                      Just replaced 'em both,--set worked. Cap is 220pF 1Kv as I recall...
                      I have replaced the cap with a good one, still no Pfc. Also I have checked the Mosfet and Pfc control Ic.
                      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                      https://www.facebook.com/Telford-Tel...7894576335359/

                        Comment

                        • ReeceyBurger123
                          Never Give Up !
                          • May 2014
                          • 7325
                          • Britain
                          #7
                          Re: Technika LCD40HD 17PW16 Blown Up

                          Originally posted by finntricky
                          try this, i have a few of these and this was the fault, https://www.youtube.com/watch?v=q-fEpxAlmO0
                          Cheers, however all the solder joints on the Pfc side of things are good I re-soldered them to be sure.
                          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                          https://www.facebook.com/Telford-Tel...7894576335359/

                            Comment

                            • CapLeaker
                              Leaking Member
                              • Dec 2014
                              • 8226
                              • Canada
                              #8
                              Re: Technika LCD40HD 17PW16 Blown Up

                              did you replace that PFC IC?

                                Comment

                                • ReeceyBurger123
                                  Never Give Up !
                                  • May 2014
                                  • 7325
                                  • Britain
                                  #9
                                  Re: Technika LCD40HD 17PW16 Blown Up

                                  Not yet might give it a blast though, I have seen this before and never has it been the Pfc Ic.
                                  Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                                  https://www.facebook.com/Telford-Tel...7894576335359/

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