Sansui Sled2453w No Standby Set Is Dead

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  • Sinfury2112
    Senior Member
    • Jul 2014
    • 71
    • USA
    #1

    Sansui Sled2453w No Standby Set Is Dead

    Hello,
    Trying to fix this set for friend of mine there is no standby light at all he said heard pop and quit working. Fuse is good I found a blown 0.22 ohm resistor replaced that now have 170v across main cap he purchased new mainboard from ebay but the prob lies in the psu somewhere cant find schematics anywhere what I think is the startup cap 50v 22uf has 10v across it any help would be much appreciated here is pics of the psu below thanks for looking P.S also tested large diodes and mosfet out of the board tested okay tested all smaller diodes in board tested okay
    Attached Files
    Last edited by Sinfury2112; 08-20-2015, 01:33 PM.
    Tags: None
    • CapLeaker
      Leaking Member
      • Dec 2014
      • 8005
      • Canada
      #2
      Re: Sansui Sled2453w No Standby Set Is Dead

      Sorry... you got to make better pics than that. Everything is just a big blurr.

        Comment

        • Sinfury2112
          Senior Member
          • Jul 2014
          • 71
          • USA
          #3
          Re: Sansui Sled2453w No Standby Set Is Dead

          Originally posted by CapLeaker
          Sorry... you got to make better pics than that. Everything is just a big blurr.
          Here Are Clearer Pictures I Hope This Helps
          Attached Files

            Comment

            • CapLeaker
              Leaking Member
              • Dec 2014
              • 8005
              • Canada
              #4
              Re: Sansui Sled2453w No Standby Set Is Dead

              Not really... those are better, but I still can't read not a thing. Be careful there are lethal voltages in the primary circuit. Plug the PSU in and see what you get on the main filter cap.

                Comment

                • Sinfury2112
                  Senior Member
                  • Jul 2014
                  • 71
                  • USA
                  #5
                  Re: Sansui Sled2453w No Standby Set Is Dead

                  Originally posted by CapLeaker
                  Not really... those are better, but I still can't read not a thing. Be careful there are lethal voltages in the primary circuit. Plug the PSU in and see what you get on the main filter cap.
                  I get 170v on the cap

                    Comment

                    • Sinfury2112
                      Senior Member
                      • Jul 2014
                      • 71
                      • USA
                      #6
                      Re: Sansui Sled2453w No Standby Set Is Dead

                      sorry about crappy photos I think you can read these now LOL my cam really sucks!!
                      Attached Files

                        Comment

                        • jetadm123
                          Badcaps Legend
                          • Feb 2010
                          • 2169
                          #7
                          Re: Sansui Sled2453w No Standby Set Is Dead

                          With power disconnected, try checking large transistor Q501 for a short. Really surprised it's not heat sinked.
                          Last edited by jetadm123; 08-21-2015, 10:47 AM.

                            Comment

                            • Sinfury2112
                              Senior Member
                              • Jul 2014
                              • 71
                              • USA
                              #8
                              Re: Sansui Sled2453w No Standby Set Is Dead

                              Originally posted by jetadm123
                              With power disconnected, try checking large transistor Q501 for a short. Really surprised it's not heat sinked.
                              I tested that mosfet out of the board checked good im stumped well my meter has only 1.6v in the diode test mode so I used a 9v battery to charge the mosfet in the on position does it matter?
                              Last edited by Sinfury2112; 08-21-2015, 11:04 AM.

                                Comment

                                • Sinfury2112
                                  Senior Member
                                  • Jul 2014
                                  • 71
                                  • USA
                                  #9
                                  Re: Sansui Sled2453w No Standby Set Is Dead

                                  I think I just found my problem the opt coupler is wide open both sides
                                  2561a is part number
                                  Last edited by Sinfury2112; 08-21-2015, 12:08 PM.

                                    Comment

                                    • CapLeaker
                                      Leaking Member
                                      • Dec 2014
                                      • 8005
                                      • Canada
                                      #10
                                      Re: Sansui Sled2453w No Standby Set Is Dead

                                      did you check fuse F501?

                                        Comment

                                        • Sinfury2112
                                          Senior Member
                                          • Jul 2014
                                          • 71
                                          • USA
                                          #11
                                          Re: Sansui Sled2453w No Standby Set Is Dead

                                          yep fuse is good thank you

                                            Comment

                                            • Sinfury2112
                                              Senior Member
                                              • Jul 2014
                                              • 71
                                              • USA
                                              #12
                                              Re: Sansui Sled2453w No Standby Set Is Dead

                                              it had a resister blown when I first got the set it protected the fuse

                                                Comment

                                                • CapLeaker
                                                  Leaking Member
                                                  • Dec 2014
                                                  • 8005
                                                  • Canada
                                                  #13
                                                  Re: Sansui Sled2453w No Standby Set Is Dead

                                                  check those black square and blue caps on the primary.

                                                    Comment

                                                    • Sinfury2112
                                                      Senior Member
                                                      • Jul 2014
                                                      • 71
                                                      • USA
                                                      #14
                                                      Re: Sansui Sled2453w No Standby Set Is Dead

                                                      there is not any markings on the blue caps if I need to replace them I will try test them best I can I don't have an esr meter

                                                        Comment

                                                        • CapLeaker
                                                          Leaking Member
                                                          • Dec 2014
                                                          • 8005
                                                          • Canada
                                                          #15
                                                          Re: Sansui Sled2453w No Standby Set Is Dead

                                                          that long blue cap I mean. you don't need an ESR for those type of caps.

                                                            Comment

                                                            • Sinfury2112
                                                              Senior Member
                                                              • Jul 2014
                                                              • 71
                                                              • USA
                                                              #16
                                                              Re: Sansui Sled2453w No Standby Set Is Dead

                                                              on the long blue cap it is reading OL. on all of the Resistance Settings its marked GM 223J 2G S'M08 have no idea what the values are to replace it Im guessing its bad

                                                                Comment

                                                                • CapLeaker
                                                                  Leaking Member
                                                                  • Dec 2014
                                                                  • 8005
                                                                  • Canada
                                                                  #17
                                                                  Re: Sansui Sled2453w No Standby Set Is Dead

                                                                  That should be a 0.022uF/400V cap. You can't measure a cap like that with your meter in resistance. You have to set your DMM into capacitance (if it has one).

                                                                    Comment

                                                                    • jetadm123
                                                                      Badcaps Legend
                                                                      • Feb 2010
                                                                      • 2169
                                                                      #18
                                                                      Re: Sansui Sled2453w No Standby Set Is Dead

                                                                      The 10v across the startup cap appears a bit low. It should be connected to the vcc leg of the 8-legged pwm smd chip on bottom of the board. If yes, then try replacing the startup cap and see what happens.

                                                                        Comment

                                                                        • Sinfury2112
                                                                          Senior Member
                                                                          • Jul 2014
                                                                          • 71
                                                                          • USA
                                                                          #19
                                                                          Re: Sansui Sled2453w No Standby Set Is Dead

                                                                          the 223j cap measures 23.60nf on meter in cap mode is this bad? the small startup cap measures 23uf and its a 50v 22uf cap

                                                                            Comment

                                                                            • CapLeaker
                                                                              Leaking Member
                                                                              • Dec 2014
                                                                              • 8005
                                                                              • Canada
                                                                              #20
                                                                              Re: Sansui Sled2453w No Standby Set Is Dead

                                                                              The 223j is good. For the electrolytic one you'd need an esr meter, to make sure, I doubt it's bad, but can change it and see what's happens

                                                                                Comment

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