Toshiba 24d1434db / Vestal 17IPS61-3 help

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  • dooosuk
    Member
    • May 2016
    • 24
    • United Kingdom
    #1

    Toshiba 24d1434db / Vestal 17IPS61-3 help

    Hi,

    I'm new to this so please bear with me. I've been reading plenty of threads and so I'm hoping I've tracked down my issue.

    My toshiba 24d1434db has no power, not even the standby led.

    The capacitors all look OK and there doesn't appear to be an obvious blown component from looking at the board.

    I've found threads for the Vestal boards which appear to indicate faulty diodes may be the issue.

    I've tested with a multimeter and get the following readings:

    D8 - no diode fitted
    D9 (UF5402) - 0500 and 1000 when poles reversed
    D10 (SB5B0) - 0030 and 0050 when poles reversed
    D11 - no diode fitted
    D12 (SB5B0) - 0030 and 0050 when poles reversed
    D25 (SB5B0) - 0030 and 0050 when poles reversed

    So I understand it's likely to be only one of the SB5B0 diodes but I'm best replacing them all. Can I fit a better diode? Any suggestions?

    Should I replace the UF5402 diode as well or is that reading all ok and best left as is?

    Can I fit extra diodes in D11 and D8 without any issues? (On one thread someone appeared to do this). Would this reduce the chance of a future re-occurrence as well as using thermal epoxy?

    Thanks, your help is appreciated.
    Attached Files
    Last edited by dooosuk; 05-27-2016, 03:02 AM.
    Tags: None
    • vinceroger69
      Badcaps Legend
      • Mar 2012
      • 6714
      • uk
      #2
      Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

      with diodes if im not sure i always unsolder and lift one side off the board and retest that way sometimes you can see if diodes are leaky too.
      Last edited by vinceroger69; 05-27-2016, 03:54 AM.

        Comment

        • ReeceyBurger123
          Never Give Up !
          • May 2014
          • 7325
          • Britain
          #3
          Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

          Checked if you have a voltage on the other side of the diodes ?
          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

            • dooosuk
              Member
              • May 2016
              • 24
              • United Kingdom
              #4
              Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

              Originally posted by ReeceyBurger123
              Checked if you have a voltage on the other side of the diodes ?
              I thought I'd read the voltages on both sides and listed them above. Will re-check with my multi-meter later but sounds like I probably need to unsolder one side first.
              Last edited by dooosuk; 05-27-2016, 04:11 AM.

                Comment

                • dooosuk
                  Member
                  • May 2016
                  • 24
                  • United Kingdom
                  #5
                  Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

                  Right, so I've de-soldered the diodes and taken the readings again

                  D8 - no diode fitted
                  D9 (UF5402) - 0500 and OL when poles reversed
                  D10 (SB5B0) - dodgy
                  D11 - no diode fitted
                  D12 (SB5B0) - 0300 and OL when poles reversed
                  D25 (SB5B0) - 0300 and OL when poles reversed

                  So, my original questions still stand

                  I'll replace all the SB5B0 diodes but is there a better diode I can fit? Any suggestions?

                  Can I fit extra diodes in D11 and D8 without any issues? (On one thread someone appeared to do this). Would this reduce the chance of a future re-occurrence as well as using thermal epoxy?

                  Thanks, your help is appreciated.

                    Comment

                    • vinceroger69
                      Badcaps Legend
                      • Mar 2012
                      • 6714
                      • uk
                      #6
                      Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

                      tom66 in another thread recomends these
                      http://www.ebay.co.uk/itm/UF5408-Rec...item25789d54dd

                      https://www.badcaps.net/forum/showthread.php?t=41922

                      But if it was my set i would replace like for like with the diodes but i would change all of them in one go
                      Last edited by vinceroger69; 06-01-2016, 10:59 AM.

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

                          Those, or MUR460 / HER308G.
                          Needs to be a fast diode, so 1N5408 is no good. UF5408 is a fast type.
                          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

                            • vinceroger69
                              Badcaps Legend
                              • Mar 2012
                              • 6714
                              • uk
                              #8
                              Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

                              is there a upgrade for the SB5B0 diodes tom

                                Comment

                                • dooosuk
                                  Member
                                  • May 2016
                                  • 24
                                  • United Kingdom
                                  #9
                                  Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

                                  Just to clear up some of the information above, are we saying:

                                  Replace the UF5402 with a UF5408
                                  Replace the SB5B0 with a SB5100 or similar (from this post https://www.badcaps.net/forum/showpo...5&postcount=48)

                                  Thanks

                                    Comment

                                    • vinceroger69
                                      Badcaps Legend
                                      • Mar 2012
                                      • 6714
                                      • uk
                                      #10
                                      Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

                                      http://www.ebay.co.uk/itm/1722173855...%3AMEBIDX%3AIT
                                      http://www.ebay.co.uk/itm/1717147546...%3AMEBIDX%3AIT

                                      these are what i have just ordered as i have a set here needing the diodes changed.
                                      Last edited by vinceroger69; 06-02-2016, 03:09 AM.

                                        Comment

                                        • ReeceyBurger123
                                          Never Give Up !
                                          • May 2014
                                          • 7325
                                          • Britain
                                          #11
                                          Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

                                          Originally posted by vinceroger69
                                          http://www.ebay.co.uk/itm/1722173855...%3AMEBIDX%3AIT
                                          http://www.ebay.co.uk/itm/1717147546...%3AMEBIDX%3AIT

                                          these are what i have just ordered as i have a set here needing the diodes changed.
                                          Cheers bud
                                          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

                                            • dooosuk
                                              Member
                                              • May 2016
                                              • 24
                                              • United Kingdom
                                              #12
                                              Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

                                              All fixed with the new SB5100's.

                                              Thanks chaps

                                                Comment

                                                • ReeceyBurger123
                                                  Never Give Up !
                                                  • May 2014
                                                  • 7325
                                                  • Britain
                                                  #13
                                                  Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

                                                  Nice one
                                                  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

                                                    • GnobarEl
                                                      Member
                                                      • Feb 2020
                                                      • 17
                                                      • Portugal
                                                      #14
                                                      Re: Toshiba 24d1434db / Vestal 17IPS61-3 help

                                                      Nice! Well done!

                                                        Comment

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