dukane optoma

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  • yonu
    Senior Member
    • Nov 2007
    • 138
    • United States

    #1

    dukane optoma

    Ok guys have another problem no this time it isn't user stupidity

    while teaching today my fathers projector blew the fuse so I changed the fuse it blew the new one so i removed the internal power supply from the unit and and hooked it up and it blows every fuse that is installed it appears that it is a voltage regulator on the psu board I have incuded a couple of images and i will take some better photos when my good camera is done charging
    Attached Files
  • japlytic
    Badcaps Legend
    • Oct 2005
    • 2086
    • Australia

    #2
    Re: dukane optoma

    They look like rectifiers or MOSFETs.
    One at a time, remove a burnt-out component attached to the heatsink, and note its location and markings on the component.
    It would be helpful if you have the model number for the projector.
    My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

    Comment

    • shadow
      Badcaps Veteran
      • Feb 2007
      • 732
      • Australia

      #3
      Re: dukane optoma

      The components that are 'sparking' seem to be MOSFET's. These components tend to fail short. That is that when they fail, most of the time the connections are shorted together. You can do a quick test to see this is the case with a multimeter. It is advisable to take the components out before testing, however I am not sure if it is absolutely critical. If the MOSFET's are shorted, then any fuse will blow because excessive current would flow.

      The next question is has anything else failed due to the failed MOSFET's?

      Comment

      • yonu
        Senior Member
        • Nov 2007
        • 138
        • United States

        #4
        Re: dukane optoma

        it is a dukane optoma ezpro 550

        and i will remove the 2 end ones how can I tell if they are bad I would assume witht he sparking that they will be burnt

        Thanks,
        yonu

        Comment

        • yonu
          Senior Member
          • Nov 2007
          • 138
          • United States

          #5
          Re: dukane optoma

          ok now to sound stupid the mosfets ar ethe black thaings correct if so that is the problem I removed the heatsink and one of the legs had melted completly off of it will post a image in a moment

          Comment

          • davmax
            Badcaps Veteran
            • Dec 2005
            • 899

            #6
            Re: dukane optoma

            When testing MOSFEt's it is best to disconnect the two outside leads. Having said that , testing in situ can still be a good indicator. It looks like you have four MOSFET's, two driving each output transformer. Usually only one of a pair fails so you can simply compare the ohmmeter on lowest ohm range(multimeter setting) readings of each device to find the failed one. If you place the positive meter lead on the metal tab of a device then probe the two outer leads with the negative meter lead you should be able to determine if a device is shorted. If both outer leads read a short the device is failed. However check and compare all devices for a differences. If sparking occurrs check the insulation of each device to the heatsink. Place the an ohmmeter lead on each device tab (one at a time) and the other where the heat sink is attached to the PCB (a metal contact) a high to infinite resistance should be found, this unfortunately depends on the circuit and the infinite resistance that it is supposed to be can only be obtained by disconnecting the MOSFET. If this insulation has a failure then it must be fixed.
            Gigabyte EP45-DS3L Ultra Reliable (Power saver)
            Intel E8400 (3000Mhz) Bios temps. 4096Mb 800Mhz DDR2 Corsair XMS2 4-4-4-12
            160Gb WD SATAII Server grade
            Nvidia 8500GT 256Mb
            160Gb WD eSATAII Server grade for backup.
            Samsung 18x DVD writer
            Pioneer 16x DVD writer + 6x Dual layer
            33 way card reader
            Windows XP Pro SP3
            Thermaltake Matrix case with 430W Silent Power
            17" Benq FP737s LCD monitor
            HP Officejet Pro K5300 with refillable tanks

            Comment

            • yonu
              Senior Member
              • Nov 2007
              • 138
              • United States

              #7
              Re: dukane optoma

              here is the image
              Attached Files

              Comment

              • yonu
                Senior Member
                • Nov 2007
                • 138
                • United States

                #8
                Re: dukane optoma

                thanks I think i found the problem I think the one that burned out was the problem however is it normal for a MOSFET to actually burn off a leg like that?

                Comment

                • davmax
                  Badcaps Veteran
                  • Dec 2005
                  • 899

                  #9
                  Re: dukane optoma

                  Your picture definitely confirms that these are MOSFETs, see the IRF number as the part number. The other device to the left appears to have black on the PCB.

                  Clearly a very heavy current has caused the lead to burn out. This is usualy protect by the fuse. If the fuse has been upgraded this protecion is lost and the lead burns up.

                  You will need to replace both MOSFETs and clean up the PCB because the black is conductive. Check for any other affected components.

                  When replacing always check that the device is completely isolated from the heatsink with the insulator using an ohmmeter on the high resistance range, replace the insulator if there is a risk.

                  Check the soldered joints and PCB track to the transformer that is part of that circuit.
                  Gigabyte EP45-DS3L Ultra Reliable (Power saver)
                  Intel E8400 (3000Mhz) Bios temps. 4096Mb 800Mhz DDR2 Corsair XMS2 4-4-4-12
                  160Gb WD SATAII Server grade
                  Nvidia 8500GT 256Mb
                  160Gb WD eSATAII Server grade for backup.
                  Samsung 18x DVD writer
                  Pioneer 16x DVD writer + 6x Dual layer
                  33 way card reader
                  Windows XP Pro SP3
                  Thermaltake Matrix case with 430W Silent Power
                  17" Benq FP737s LCD monitor
                  HP Officejet Pro K5300 with refillable tanks

                  Comment

                  • yonu
                    Senior Member
                    • Nov 2007
                    • 138
                    • United States

                    #10
                    Re: dukane optoma

                    should I go ahead and replace all 4 mosfets or ust the those 2 and what is the best way to clean up the board?

                    Comment

                    • japlytic
                      Badcaps Legend
                      • Oct 2005
                      • 2086
                      • Australia

                      #11
                      Re: dukane optoma

                      Use metho to clean up the board and replace all four MOSFETS (all four look like they have blown). The MOSFETs are IRFP450 - 500V 14A, with an ON resistance of 0.33 ohms - rds(ON) is 0.33 ohms.
                      You should also check the components connected to the MOSFETs too.
                      My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

                      Comment

                      • davmax
                        Badcaps Veteran
                        • Dec 2005
                        • 899

                        #12
                        Re: dukane optoma

                        I am unable to see that the second pair of MOSFETs is blown. Clearly the two that are visible need changing. As these are two seperate circuits, two devices to each transformer, the others do not need changing unless they are blown.
                        Gigabyte EP45-DS3L Ultra Reliable (Power saver)
                        Intel E8400 (3000Mhz) Bios temps. 4096Mb 800Mhz DDR2 Corsair XMS2 4-4-4-12
                        160Gb WD SATAII Server grade
                        Nvidia 8500GT 256Mb
                        160Gb WD eSATAII Server grade for backup.
                        Samsung 18x DVD writer
                        Pioneer 16x DVD writer + 6x Dual layer
                        33 way card reader
                        Windows XP Pro SP3
                        Thermaltake Matrix case with 430W Silent Power
                        17" Benq FP737s LCD monitor
                        HP Officejet Pro K5300 with refillable tanks

                        Comment

                        • yonu
                          Senior Member
                          • Nov 2007
                          • 138
                          • United States

                          #13
                          Re: dukane optoma

                          thanks guys am getting ready to go pick up the mosfets now as far as i can tell eveything that connect to them is fine will let you know if that does the trick

                          Comment

                          • yonu
                            Senior Member
                            • Nov 2007
                            • 138
                            • United States

                            #14
                            Re: dukane optoma

                            well I guess I am at a standstill until I can fidn the mosfets online our local electronics store wand $16.99ea and said it will take a week to get them

                            tanks again and will let you know if that works when i get the new ones

                            Comment

                            • yonu
                              Senior Member
                              • Nov 2007
                              • 138
                              • United States

                              #15
                              Re: dukane optoma

                              hey should these work

                              http://cgi.ebay.com/IRFP450-MOSFET-N...QQcmdZViewItem

                              tyhey have the same number of the mosfet but they are saying they 500v

                              Thanks

                              Comment

                              • davmax
                                Badcaps Veteran
                                • Dec 2005
                                • 899

                                #16
                                Re: dukane optoma

                                Same part number MOSFET should be just fine and at a good price. Get four at that price.
                                Gigabyte EP45-DS3L Ultra Reliable (Power saver)
                                Intel E8400 (3000Mhz) Bios temps. 4096Mb 800Mhz DDR2 Corsair XMS2 4-4-4-12
                                160Gb WD SATAII Server grade
                                Nvidia 8500GT 256Mb
                                160Gb WD eSATAII Server grade for backup.
                                Samsung 18x DVD writer
                                Pioneer 16x DVD writer + 6x Dual layer
                                33 way card reader
                                Windows XP Pro SP3
                                Thermaltake Matrix case with 430W Silent Power
                                17" Benq FP737s LCD monitor
                                HP Officejet Pro K5300 with refillable tanks

                                Comment

                                • yonu
                                  Senior Member
                                  • Nov 2007
                                  • 138
                                  • United States

                                  #17
                                  Re: dukane optoma

                                  actually at that price I am going to by about 10 or so incase i need them for something else later

                                  Thanks

                                  Comment

                                  • yonu
                                    Senior Member
                                    • Nov 2007
                                    • 138
                                    • United States

                                    #18
                                    Re: dukane optoma

                                    ok I got the mosfets intoday and I got ehm changed however upon the first time switching on the power rather than Blowing the fuse and sparking it threw the main breaker and blew the fuse any ideas would be great on what to look at next.

                                    Thanks

                                    Comment

                                    • yonu
                                      Senior Member
                                      • Nov 2007
                                      • 138
                                      • United States

                                      #19
                                      Re: dukane optoma

                                      sorry about the double post

                                      Comment

                                      • yonu
                                        Senior Member
                                        • Nov 2007
                                        • 138
                                        • United States

                                        #20
                                        Re: dukane optoma

                                        ok upon further checking with a ohm meter it turns out that every leg on this mosfet and the 2 circled legs have a reading to the center pin of the other 3 mosfets so if anyone can make a suggestion to find out what is causing this it would be great

                                        Thanks again
                                        Attached Files

                                        Comment

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