Sky Box DSI8215 no power

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  • Ralph Green
    Senior Member
    • Feb 2013
    • 66
    • UK

    #1

    Sky Box DSI8215 no power

    Hi all.
    I have no power DSI8215. PSU FSP042-5P01. Can not see any bad caps. Someone tried to fix it by replacing caps and had no luck. Does anybody know what is a most failure with this PSU?
  • nogger
    Senior Member
    • Aug 2010
    • 190

    #2
    Re: Sky Box DSI8215 no power

    Hi, do you have ANY voltages appearing on the secondary side ?

    Graham

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: Sky Box DSI8215 no power

      Good clear pictures of the unit and the boards?
      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

      • nogger
        Senior Member
        • Aug 2010
        • 190

        #4
        Re: Sky Box DSI8215 no power

        I used to repair these boards on a regular daily basis, used in Thomson Sky HD boxes. Check first if there's ANY voltages on the white connector (3.3 v , 6.5 v & where it says +38v you should have +24 volts (the marking on the board is incorrect).

        If totally dead then check the resistor R15 (0.33ohms) for open circuit.its in the source circuit of the FET on the silver heatsink If its open the the FET will be toast & quite likely several of the small resistors such as R21,R24 , R26 & the small diode D22.


        The mains smoother cap (C14) is a Capxon (or was unless its been changed) & they had a tendency to go open & then that would blow the FET etc.

        If the FET & R15 are intact then check the 2 1Mohm resistors R20 & R22 as they supply the start up voltage to the PWM chip, make sure they read ok through to pin 3 of the chip. I have had dry joints on these resistors before now.

        Graham

        Comment

        • nogger
          Senior Member
          • Aug 2010
          • 190

          #5
          Re: Sky Box DSI8215 no power

          I used to repair these boards on a regular daily basis, used in Thomson Sky HD boxes. Check first if there's ANY voltages on the white connector (3.3 v , 6.5 v & where it says +38v you should have +24 volts (the marking on the board is incorrect).

          If totally dead then check the resistor R15 (0.33ohms) for open circuit.its in the source circuit of the FET on the silver heatsink If its open the the FET will be toast & quite likely several of the small resistors such as R21,R24 , R26 & the small diode D22.


          The mains smoother cap (C14) is a Capxon (or was unless its been changed) & they had a tendency to go open & then that would blow the FET etc.

          If the FET & R15 are intact then check the 2 1Mohm resistors R20 & R22 as they supply the start up voltage to the PWM chip, make sure they read ok through to pin 3 of the chip. I have had dry joints on these resistors before now.

          Graham

          Comment

          • Ralph Green
            Senior Member
            • Feb 2013
            • 66
            • UK

            #6
            Re: Sky Box DSI8215 no power

            There is voltage on the connector but is not right:
            6.5V is 2V
            3.5V is 1.4V
            14V is 7.7V
            -9V is -4.8V
            38V is 13V

            It makes a click noise as well.

            Comment

            • nogger
              Senior Member
              • Aug 2010
              • 190

              #7
              Re: Sky Box DSI8215 no power

              Check on the secondary side near the white plug the small diodes D90,ZD90 ,ZD91 ,D92 for s/c.(they quite often fail leading to low output) . Also, you said someone has tried changing the caps, did they change C14 (the big one) & have you confirmed that they have put the right value caps in & they haven't put a solder short anywhere ?. Post a pic of the board if you can (both sides) , maybe i can see something from that.

              Graham

              Comment

              • tom66
                EVs Rule
                • Apr 2011
                • 32560
                • UK

                #8
                Re: Sky Box DSI8215 no power

                Check startup capacitor if PSU makes a click sound.
                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

                • Ralph Green
                  Senior Member
                  • Feb 2013
                  • 66
                  • UK

                  #9
                  Re: Sky Box DSI8215 no power

                  I did swap startup capacitor with another one but make no different. I've checked D40, D50, D60 and Q10 all good. Not shorted.

                  Comment

                  • budm
                    Badcaps Legend
                    • Feb 2010
                    • 40746
                    • USA

                    #10
                    Re: Sky Box DSI8215 no power

                    What DC voltage do you get right at the two legs of the start up cap?
                    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

                    • Ralph Green
                      Senior Member
                      • Feb 2013
                      • 66
                      • UK

                      #11
                      Re: Sky Box DSI8215 no power

                      There is 321V DC.

                      Comment

                      • tom66
                        EVs Rule
                        • Apr 2011
                        • 32560
                        • UK

                        #12
                        Re: Sky Box DSI8215 no power

                        That's the main filter cap - the start up cap is much smaller and near the control IC.
                        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

                        • Ralph Green
                          Senior Member
                          • Feb 2013
                          • 66
                          • UK

                          #13
                          Re: Sky Box DSI8215 no power

                          Near SG6841DZ?

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Sky Box DSI8215 no power

                            Probably -- assuming that is the controller IC.
                            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

                            • Ralph Green
                              Senior Member
                              • Feb 2013
                              • 66
                              • UK

                              #15
                              Re: Sky Box DSI8215 no power

                              There was 10uF/50V replaced with now one but still no luck.

                              Comment

                              • budm
                                Badcaps Legend
                                • Feb 2010
                                • 40746
                                • USA

                                #16
                                Re: Sky Box DSI8215 no power

                                We need to see the pictures of the board so there will be no confusion like where that start up cap is.
                                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

                                • nogger
                                  Senior Member
                                  • Aug 2010
                                  • 190

                                  #17
                                  Re: Sky Box DSI8215 no power

                                  Did you check the diodes etc i mentioned in my previous post ? cap polarity & checked for solder shorts on the secondary tracks ?

                                  Comment

                                  • Ralph Green
                                    Senior Member
                                    • Feb 2013
                                    • 66
                                    • UK

                                    #18
                                    Re: Sky Box DSI8215 no power

                                    Yes, all checked. Diodes, caps and solder as well.

                                    Comment

                                    • vinceroger69
                                      Badcaps Legend
                                      • Mar 2012
                                      • 6714
                                      • uk

                                      #19
                                      Re: Sky Box DSI8215 no power

                                      was all 15 capacitors replaced there is a full repair kit on ebay although cpc etc will be cheaper imo

                                      Comment

                                      • Ralph Green
                                        Senior Member
                                        • Feb 2013
                                        • 66
                                        • UK

                                        #20
                                        Re: Sky Box DSI8215 no power

                                        Yes, all replaced but not by me.

                                        Comment

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