Toshiba 32BV702B- DEAD

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  • WallArt-Online
    Member
    • Aug 2013
    • 29
    • uk

    #1

    Toshiba 32BV702B- DEAD

    Hi,

    I was asked if I could have a look at the above tv, there is no display, sound, leds, or anything showing any sign of life before I opened it.

    I took the unit apart and couldn't see any obvious damage. Not having knowledge to check voltages or anything I suggested that it was more than likely the power supply board that was dead seen as though there was no standby light lit. After discussing this we purchased a replacement board from ebay and fitted it, I then tried the unit again, -same result no power.

    After unplugging the tv I noticed the plug had a 13 amp fuse in but the plug states 5amp, I replaced the fuse and tried the unit again but still nothing.

    Could the 13amp fuse of blown something? Would any of the other 2 boards cause this problem? or do you think the replacement board could be shot?

    Any help appreciated

    Ps the power board is a 17PW25-4 V1

    Thanks
  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK

    #2
    Re: Toshiba 32BV702B- DEAD

    Check the fuse on your power board (not just the one in the plug) and check for burn marks/discolaration around the transistor mounted on the heatsink.

    The plug should use a 3A or 5A fuse, the fuse is ONLY to protect the plug and wiring. The equipment should posses its own internal fuse to protect itself.

    99% of the time a dead set on these Vestel PSUs it's a blown primary transistor due to shorted output diodes. TV is built by Vestel which is an OEM, the same TV is sold under the likes of Technika, Alba, Bush, etc. utter rubbish and a shame Toshiba is rebadging such.
    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

    • WallArt-Online
      Member
      • Aug 2013
      • 29
      • uk

      #3
      Re: Toshiba 32BV702B- DEAD

      Are you refering to the part i have circled in red?

      Also the part in orange was not on the original board I swapped but the model of both board is exactly the same
      Attached Files

      Comment

      • zomi
        Badcaps Veteran
        • Nov 2011
        • 505

        #4
        Re: Toshiba 32BV702B- DEAD

        Did you swap the capacitor too ?
        the one infront of the part circled in orange ?

        Comment

        • WallArt-Online
          Member
          • Aug 2013
          • 29
          • uk

          #5
          Re: Toshiba 32BV702B- DEAD

          No I never swapped any components, that board pictured is the replacement I purchased on ebay, was stated that it was tested and working.

          Comment

          • zomi
            Badcaps Veteran
            • Nov 2011
            • 505

            #6
            Re: Toshiba 32BV702B- DEAD

            I have cricled in green
            I think this will not also be present in your purchased psu...
            Attached Files

            Comment

            • WallArt-Online
              Member
              • Aug 2013
              • 29
              • uk

              #7
              Re: Toshiba 32BV702B- DEAD

              Is there a way to test it with a multimeter?

              Comment

              • WallArt-Online
                Member
                • Aug 2013
                • 29
                • uk

                #8
                Re: Toshiba 32BV702B- DEAD

                Just realized what you have said, Why would it be missing on one board?

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #9
                  Re: Toshiba 32BV702B- DEAD

                  Wait... are you saying the power board you bought from eBay had the device on the heatsink missing?
                  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

                  • WallArt-Online
                    Member
                    • Aug 2013
                    • 29
                    • uk

                    #10
                    Re: Toshiba 32BV702B- DEAD

                    Ok even i'm getting confused here.

                    The board pictured is the one from eBay, It has the exact same markings stamped (model number and revision) but has the extra black plug bit on (circled in orange).

                    Zomi has said he believes the original board (back in the unit) will have the green cap missing.

                    Comment

                    • nomoresonys
                      Badcaps Legend
                      • Jan 2013
                      • 12132
                      • U.S.

                      #11
                      Re: Toshiba 32BV702B- DEAD

                      might have gotten a mismatch, sometimes theres 3 or 4 different boards for same model but they dont all necessarily match with the other boards.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: Toshiba 32BV702B- DEAD

                        Oh. I think I understand now.

                        That black plug is for a mains switch. Since your set does not have such a switch you will have to bypass it. The best way is to solder a jumper wire across the bottom terminals.
                        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

                        • WallArt-Online
                          Member
                          • Aug 2013
                          • 29
                          • uk

                          #13
                          Re: Toshiba 32BV702B- DEAD

                          your joking?! All I probably have to do is short that out?

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Toshiba 32BV702B- DEAD

                            Yes. I've had to do it before on other Vestel power boards when using incompatible ones.
                            Note, if you get a blinking LED and set not powering on after doing this, there is one more thing you need to do (but we'll deal with that later.)
                            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

                            • WallArt-Online
                              Member
                              • Aug 2013
                              • 29
                              • uk

                              #15
                              Re: Toshiba 32BV702B- DEAD

                              It's now blinking red and green

                              Comment

                              • tom66
                                EVs Rule
                                • Apr 2011
                                • 32560
                                • UK

                                #16
                                Re: Toshiba 32BV702B- DEAD

                                Ok pull the board out and get a picture underneath the area of the connector that goes off to the main board.
                                Needs to be clear and in focus... you have to remove a small component to convert the board to the compatible version.
                                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

                                • WallArt-Online
                                  Member
                                  • Aug 2013
                                  • 29
                                  • uk

                                  #17
                                  Re: Toshiba 32BV702B- DEAD

                                  Hope this is clear
                                  Attached Files

                                  Comment

                                  • WallArt-Online
                                    Member
                                    • Aug 2013
                                    • 29
                                    • uk

                                    #18
                                    Re: Toshiba 32BV702B- DEAD

                                    comparing the boards is it S814 that needs removing?

                                    Comment

                                    • tom66
                                      EVs Rule
                                      • Apr 2011
                                      • 32560
                                      • UK

                                      #19
                                      Re: Toshiba 32BV702B- DEAD

                                      Ok, S814, see next to the connector? It's the component with "0" marked on it. Simply apply solder to both ends and slide it off. It's a zero ohm link - basically, a piece of wire in a box.

                                      edit: you beat me to it... good eye
                                      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

                                      • nomoresonys
                                        Badcaps Legend
                                        • Jan 2013
                                        • 12132
                                        • U.S.

                                        #20
                                        Re: Toshiba 32BV702B- DEAD

                                        this is COOL how you guys made it work. you didnt have to buy a new board.
                                        Last edited by nomoresonys; 02-11-2015, 09:36 AM.

                                        Comment

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