17PW26-4 Odd Failure But Simple Fix

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

    #1

    17PW26-4 Odd Failure But Simple Fix

    Got this 40" Toshiba Lcd Tv its a 40BV700B which is a rebadged Vestel Tv. The fault was turns on works fine for a min then Lcd fades to white and backlight flickers badly normally about a minuet or 2 after it begins to get warm. I originally suspected we had a failed Lcd Panel as ive seen the particular Panel (LTA400HM07) fail lots of times in weird ways but the Tv stays on wont turn off afterwards, wont respond to remote or buttons meaning the processor has shutdown and turned Tcon off.

    The fault was actually the Psu, the switching section Polly cap on this Psu is C878 (grey box behind main transformer) which is a 23nf 600v type had failed. Physically bulged and measured 0nf on my cap meter. After replacing it with a 23nf 1000v type Tv works fine, been running it for hours. If I had a scope I would have checked the output of this thing but I dont, although I suspect it would be bad. Either way that cap was causing the Tv to do some goofy things.

    Hope this helps anyone who gets a 17PW26 casuing the Tv to act goofy check that Polly cap !
    Last edited by ReeceyBurger123; 01-27-2016, 03:18 PM.
    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/
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #2
    Re: 17PW26-4 Odd Failure But Simple Fix

    Can we see the pictures of the board, both sides?
    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

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

      #3
      Re: 17PW26-4 Odd Failure But Simple Fix

      Doh ! I sealed this one up but, I have another to re-cap tomorrow Bud so will get you images then. I will also replace the polly cap on it too.
      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

        #4
        Re: 17PW26-4 Odd Failure But Simple Fix

        Top side of Pcb. Output caps all changed as well as polly cap.
        Attached Files
        Last edited by ReeceyBurger123; 02-09-2016, 05:38 PM.
        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

          #5
          Re: 17PW26-4 Odd Failure But Simple Fix

          Bottom side of Pcb.
          Attached Files
          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

            #6
            Re: 17PW26-4 Odd Failure But Simple Fix

            Polly cap old vs new 223nj 630v.
            Attached Files
            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: 17PW26-4 Odd Failure But Simple Fix

              Another 2 I did a while ago bit better image quality. Both polly caps replaced (not in this image) again as well as output caps apart from that these are good Psu's
              Attached Files
              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

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