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    #61
    Re: emachines e19t6w inverter powersupply help

    Originally posted by retiredcaps View Post
    IF the parts are inexpensive, maybe get 2 fuses? At some point, this board may be unrepairable if it was damaged by the storm (power surge?). There may be PCB or internal board damage that is not fixable.

    PS. Don't forget about the 47uF cap.
    No luck my friend...

    I change the FET, Resistor, the Fuse and the 47uF Cap and no 5VDC in the output...

    Any new idea?

    Comment

      #62
      Re: emachines e19t6w inverter powersupply help

      Originally posted by jselvatici View Post
      Any new idea?
      Measure the transformer for open windings. I found a diagram of SPW-055

      http://www.premmagnetics.com/Product...px?Product=949

      I think, but not 100% sure, you should measure 5 to 6 and 7 to 8. Both ohms measurements should be the same.

      You might also want to carefully measure the voltage on the secondary pins to see it outputting anything.

      Careful with pins 1-4. They are mains voltage.
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        #63
        Re: emachines e19t6w inverter powersupply help

        Originally posted by retiredcaps View Post
        Measure the transformer for open windings. I found a diagram of SPW-055

        http://www.premmagnetics.com/Product...px?Product=949

        I think, but not 100% sure, you should measure 5 to 6 and 7 to 8. Both ohms measurements should be the same.

        You might also want to carefully measure the voltage on the secondary pins to see it outputting anything.

        Careful with pins 1-4. They are mains voltage.

        The diagram says that the transformer has 8 pins, but here it has 11 pins.
        I see the main voltage input, but hard to identify which pins are the right output voltage.
        Attached Files

        Comment

          #64
          Re: emachines e19t6w inverter powersupply help

          Originally posted by jselvatici View Post
          The diagram says that the transformer has 8 pins, but here it has 11 pins.
          I see the main voltage input, but hard to identify which pins are the right output voltage.
          Just one thing, I have 308Vdc going to Pins 1 and 3 take a GND as a reference. Pin 4 I have GND. Measuring in the other side, no reading at all, looks like a bad transformer... what do you think? Shall I remove it from the PCB to take a better look?

          Tks!

          Comment

            #65
            Re: emachines e19t6w inverter powersupply help

            Originally posted by jselvatici View Post
            Just one thing, I have 308Vdc going to Pins 1 and 3 take a GND as a reference. Pin 4 I have GND. Measuring in the other side, no reading at all, looks like a bad transformer... what do you think? Shall I remove it from the PCB to take a better look?

            Tks!
            It could be a bad transformer.

            Check out

            https://www.badcaps.net/forum/showthread.php?t=10660

            The interesting part starts at post #9 (but read everything).

            That poster has no voltage on the other side of the transformer as well. I had you do a similar test on your SMPS controller earlier when we measured that 7 pin IC on the back.
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              #66
              Re: emachines e19t6w inverter powersupply help

              Originally posted by jselvatici View Post
              Just one thing, I have 308Vdc going to Pins 1 and 3 take a GND as a reference. Pin 4 I have GND. Measuring in the other side, no reading at all, looks like a bad transformer... what do you think? Shall I remove it from the PCB to take a better look?

              Tks!
              Sorry! GND is not on Pin 4 but on Pin 5.

              On Pin 4 there was nothing.
              Attached Files

              Comment

                #67
                Re: emachines e19t6w inverter powersupply help

                Can I get a focused shot of the front board? The one that you posted earlier at

                https://www.badcaps.net/forum/attach...7&d=1282712985

                is too fuzzy to read the board designations.
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                  #68
                  Re: emachines e19t6w inverter powersupply help

                  Originally posted by retiredcaps View Post
                  Can I get a focused shot of the front board? The one that you posted earlier at

                  https://www.badcaps.net/forum/attach...7&d=1282712985

                  is too fuzzy to read the board designations.
                  Here we go...

                  I'm goingo to work now, so I will not be able to take any picture for few hours..

                  But let's keep moving...
                  tks a lot!
                  Attached Files

                  Comment

                    #69
                    Re: emachines e19t6w inverter powersupply help

                    Okay, I found a thread that might be helpful here. Please read it through carefully and maybe 2 or 3 times.

                    https://www.badcaps.net/forum/showthread.php?t=10221

                    I think it is useful for a couple of reasons.

                    1) In post #15, PlainBill goes through and describes in detail (thank you) how the 5V works. So it is definitely worth studying to see how it can be possibly applied assuming the overall design is similar.

                    2) It gives some more ideas on things to test.
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                      #70
                      Re: emachines e19t6w inverter powersupply help

                      While searching for "spw-055" I came across two Viewsonic 19 inch monitors that use this transformer and I found service manuals with schematics for both.

                      The board in the Viewsonic is close but not identical. They are at





                      The nice thing in both is there is a troubleshooting flowchart for DC output unstable.

                      There is also a schematic with the SPW-055 with its 11 pins that should help tremendously. Again, the boards are not identical, but I think close enough for troubleshooting purposes.
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                        #71
                        Re: emachines e19t6w inverter powersupply help

                        Are pins 5 And 6 of the npc 1337 bridged together?, and if they are are they supose to be?
                        Al.
                        Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                        Comment

                          #72
                          Re: emachines e19t6w inverter powersupply help

                          Originally posted by alexanna View Post
                          Are pins 5 And 6 of the npc 1337 bridged together?, and if they are are they supose to be?
                          I saw that too, but in an earlier test, he measured 11V on pin 5 and 0V on pin 6. The datasheet for NCP1337 says pin 5 is a output driver and 6 is a VCC IC supply.

                          One thing that has been bugging me is the 0V on pin 6 when I reread some of the tests that have been done.
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                            #73
                            Re: emachines e19t6w inverter powersupply help

                            Maybe reverify voltages
                            Whatever I do, I consider it a success, if in the end I am breathing, seeing, feeling and hearing!

                            Comment

                              #74
                              Re: emachines e19t6w inverter powersupply help

                              well look at that long diagonal fuse in one of the earlier pics it looks burnt on one end...

                              Comment

                                #75
                                Re: emachines e19t6w inverter powersupply help

                                Originally posted by retiredcaps View Post
                                While searching for "spw-055" I came across two Viewsonic 19 inch monitors that use this transformer and I found service manuals with schematics for both.

                                The board in the Viewsonic is close but not identical. They are at





                                The nice thing in both is there is a troubleshooting flowchart for DC output unstable.

                                There is also a schematic with the SPW-055 with its 11 pins that should help tremendously. Again, the boards are not identical, but I think close enough for troubleshooting purposes.
                                WOW!!! I saw this manual and the board is EXACTLY the same as I have!!!!

                                If I find one like this to buy, can fix my problem and I can have more time to fix the bad board... Someone knows were I find one like this?

                                Also, I'm moving and will measure some other points, because this wiring manual helps a lot!

                                Keep you all posted. Tks!

                                Comment

                                  #76
                                  Re: emachines e19t6w inverter powersupply help

                                  Originally posted by jselvatici View Post
                                  WOW!!! I saw this manual and the board is EXACTLY the same as I have!!!!
                                  Test pin 8 and 9 on the transformer. They should be shorted according to the schematic. You should get a reading of less than 1.0 ohm.
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                                    #77
                                    Re: emachines e19t6w inverter powersupply help

                                    Originally posted by retiredcaps View Post
                                    Test pin 8 and 9 on the transformer. They should be shorted according to the schematic. You should get a reading of less than 1.0 ohm.
                                    Let's take this side as a secondary, all the pins (6 , 7 , 8 , 9 , 10 , 11) are shorted and they measure less then 1.0 ohm between each other.

                                    When the transformer is installed in the PCB, it shorts 6-7 than 8-9 than 10-11. (see picture available)
                                    Attached Files

                                    Comment

                                      #78
                                      Re: emachines e19t6w inverter powersupply help

                                      Guys,

                                      Something is no good on this transformer or before it. When I take a GND as a reference, I have 308V in the pin 1 and 308V on pin 3, but nothing in the output. Also, If I check voltage between pins 1 and 3, no voltage. Is this not DC voltage?

                                      Tks!

                                      Comment

                                        #79
                                        Re: emachines e19t6w inverter powersupply help

                                        Originally posted by jselvatici View Post
                                        Something is no good on this transformer or before it. When I take a GND as a reference, I have 308V in the pin 1 and 308V on pin 3, but nothing in the output. Also, If I check voltage between pins 1 and 3, no voltage. Is this not DC voltage?
                                        Have a look at this article

                                        http://www.jestineyong.com/?p=2238
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                                          #80
                                          Re: emachines e19t6w inverter powersupply help

                                          PS. I tested this on a working LCD. If I put my black on a ground screw on the secondary side and red on the middle pin of my dual diode, I get 5V DC.

                                          Looking at page 69 of the schematics (vx1945wm-3.pdf), pins 8 and 9 go right into D805. You should get 5V DC. If not, either the diode is bad or the transformer isn't working.

                                          You can double check the dual diode by using the diode check on your multimeter. Test it like any normal diode. I believe the middle pin is your negative.
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