Vestel 17IPS72 R4 BLOWS Q7

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  • alltvrepairs
    Badcaps Veteran
    • Jan 2014
    • 239
    • Malta
    #1

    Vestel 17IPS72 R4 BLOWS Q7

    HI

    Need some help here. Led controller mosfet MDD14N25C Q7 bliwing immediately.
    Tried a replacement board and all is fine but would like to repair this.

    Suspecting either transformer shorted or gate drive from Ic. But looking for your opinion if ot is a known fault




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    • petehall347
      Badcaps Legend
      • Jan 2015
      • 4434
      • United Kingdom
      #2
      Re: Vestel 17IPS72 R4 BLOWS Q7

      check associated resistors and be sure you used a genuine replacement mosfet

        Comment

        • alltvrepairs
          Badcaps Veteran
          • Jan 2014
          • 239
          • Malta
          #3
          Re: Vestel 17IPS72 R4 BLOWS Q7

          Originally posted by petehall347
          check associated resistors and be sure you used a genuine replacement mosfet
          Tks. So far cross checked relative components against diagram but haven't identified the culprit yet

            Comment

            • slybunda
              Senior Member
              • Feb 2012
              • 131
              #4
              Re: Vestel 17IPS72 R4 BLOWS Q7

              C120 - has that got burn marks on its side?

                Comment

                • Diah
                  Badcaps Legend
                  • Feb 2013
                  • 6427
                  • Germany
                  #5
                  Re: Vestel 17IPS72 R4 BLOWS Q7

                  just bad quality,.,, replace both Chanel at once and be sure u don't have short cable of BL cable behind the screen

                    Comment

                    • alltvrepairs
                      Badcaps Veteran
                      • Jan 2014
                      • 239
                      • Malta
                      #6
                      Re: Vestel 17IPS72 R4 BLOWS Q7

                      Originally posted by slybunda
                      C120 - has that got burn marks on its side?
                      I guess you are referring to C130 47p 2kv. The brown shade is due to the heat of the underlying Mosfet

                        Comment

                        • alltvrepairs
                          Badcaps Veteran
                          • Jan 2014
                          • 239
                          • Malta
                          #7
                          Re: Vestel 17IPS72 R4 BLOWS Q7

                          Originally posted by Diah
                          just bad quality,.,, replace both Chanel at once and be sure u don't have short cable of BL cable behind the screen
                          Sorry what both channels? There is only 1 FET switching on BLs. LEDs work fine with a replacement card.

                            Comment

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