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Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

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    #16
    Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

    Ok, thanks for the feedback. In the mean time I de-soldered the optocouplers on the feedback side, as in circuit they gave me some strange readings. But they are ok as far as I can measure. And while testing I found that one of the caps I replaced was shorted… there was a tiny little solder bridge between the cap pin and a nearby exposed line…. The devil is in the details. So once I put the optos back I will test it again and hope to have a more stable 5V without overheating and maybe more…

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      #17
      Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

      One step forward the 5V circuit is now stable. If I push the on button the on board relay is switching. Unfortunately still no output on the 12v. The boosted power is rising from 350 when the psu is off up to about 390 when the psu is on. My “feeling” is that these main caps are still ok. But I know feeling does not rule out facts. But I would like to rule out some other things in the 12v circuit before touching the big boys. Any suggestions on how to trouble shoot for the next steps?

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        #18
        Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

        I have debugged further up to the Uc3895 chip where is see no voltage over the bed and grind pins… but I don't know where this vdd is coming from… traced it back to a transformer… left one on this photo
        Attached Files
        Last edited by Dynamite76; 08-18-2023, 02:41 PM.

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          #19
          Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

          You got a supervisor chip I stalled now?

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            #20
            Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

            Supervisor readings are: pgi pgo 0V fpo and pson 5V when psu off all 0V when psu is off

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              #21
              Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

              and what is it doing with the PSU on?

              Comment


                #22
                Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

                Originally posted by Dynamite76 View Post
                My “feeling” is that these main caps are still ok. But I know feeling does not rule out facts. But I would like to rule out some other things in the 12v circuit before touching the big boys. Any suggestions on how to trouble shoot for the next steps?
                If you have a means to check caps (cheap tester is fine) for ESR and capacitance, just check the primary caps anyways. They are CapXon's, after all. Because if they are bad, they can cause the PSU to misbehave in very strange ways and possibly make you chase after problems elsewhere on the board that don't really exist.

                Originally posted by Dynamite76 View Post
                One step forward the 5V circuit is now stable. If I push the on button the on board relay is switching. Unfortunately still no output on the 12v. The boosted power is rising from 350 when the psu is off up to about 390 when the psu is on.
                Good.
                Looks like at least the primary-side and 5VSB is working OK (aside from still having to check the primary caps.)
                I'll try to take a look later to see how the 12V rail is being generated. Looks like a synchronous rectifier design (with MOSFETs.) Makes it considerably more complex to analyze and troubleshoot.

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                  #23
                  Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

                  A “cheap” ERS tester is on its way…but it will take a couple of days to fly from China…. It the mean time I will focus on the rest of the circuit. At the high power side there is also this chip..? What does this chip do? Could not find a data sheet.


                  I was also trying to find any similar schematic but so far I was not successful…
                  Attached Files
                  Last edited by Dynamite76; 08-19-2023, 01:51 PM.

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                    #24
                    Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

                    Originally posted by CapLeaker View Post
                    and what is it doing with the PSU on?
                    Supervisor readings are: pgi pgo 0V fpo and pson 5V when psu off all 0V when psu is on

                    So when the psu is turned on both fpo and pson drop from 5V to 0V for the rest no changes in value

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                      #25
                      Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

                      Any hint to further troubleshoot would be welcome… I a bit clueless where to debug further… ear I will check once the meter has arrived…

                      Comment


                        #26
                        Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

                        Anybody can help me further, my options have stalled a bit

                        Comment


                          #27
                          Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

                          On what are you stuck now? Did you get the new meter? Is the PFC working?
                          Last edited by CapLeaker; 08-23-2023, 01:29 PM.

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                            #28
                            Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

                            Originally posted by CapLeaker View Post
                            On what are you stuck now? Did you get the new meter? Is the PFC working?
                            I have no output on the 12V rail... and I am not able to trace the root cause. I think the main circuit is working as it is also supplying power to the 5V circuit, which looks stable now. Unfortunately the ESR tester is on it way and has not arrived so I can not check the main caps. When I push power on button the relay is activated and voltage level at main supply goes up from 350 up to 390. On the 12v side I have measured at many points but there is no voltage level at all, also the 5V supply to various chips is not there so it must be somewhere at the start of the system. The voltage to the control chips for the 12v circuit is seperated from the standby 5V circuit as far as I can tell from tracing lines.

                            Comment


                              #29
                              Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

                              Originally posted by momaka View Post
                              If you have a means to check caps (cheap tester is fine) for ESR and capacitance, just check the primary caps anyways. They are CapXon's, after all. Because if they are bad, they can cause the PSU to misbehave in very strange ways and possibly make you chase after problems elsewhere on the board that don't really exist.


                              Good.
                              Looks like at least the primary-side and 5VSB is working OK (aside from still having to check the primary caps.)
                              I'll try to take a look later to see how the 12V rail is being generated. Looks like a synchronous rectifier design (with MOSFETs.) Makes it considerably more complex to analyze and troubleshoot.
                              I am still waiting for equipment to test the main caps... In relation to the 12V side, any input?

                              Comment


                                #30
                                Re: Dell D635EF DELTA DPS-635AB PSU with blown TNY280PN

                                Originally posted by Dynamite76 View Post
                                I am still waiting for equipment to test the main caps... In relation to the 12V side, any input?
                                I haven't been able to trace much, since the PSU uses a double-sided PCB and there are too many components in the way to see how things are connected. But all I can tell you is that the 12V rail uses synchronous rectification. There are 2 N-ch MOSFETs located between the main transformer and main output toroid. You can see them on this picture of yours here (see towards upper left corner):
                                https://www.badcaps.net/forum/attach...6&d=1692212985

                                One of these MOSFETs is Q152. The other one I can't read the PCB designator. Both are attached to long aluminum heatsinks. Their connection is probably the same as the output of this PlayStation 3 PSU that I posted here:
                                https://www.badcaps.net/forum/attach...1&d=1526486481
                                In particular, your MOSFETs should be connected similar to how Q201 and Q202/Q203 are connected (Q202 and Q203 are in parallel, so you can regard them as one larger MOSFET.) However, please verify if that is true or not. To do that, use resistance measurement on your multimeter. If true, both MOSFETs on your PSU should have their Source pins connected to ground (you'll get 0-1 Ohms of resistance when checking between ground and the Source pin of each MOSFET) and their Drain pins should also show very low resistance to the 12V rail.

                                Now also verify that neither of the MOSFETs have a short-circuit between their Source and Drain pins, Source and Gate pins, and Drain and Gate pins. Let me know what you find.

                                Originally posted by Dynamite76 View Post
                                When I push power on button the relay is activated and voltage level at main supply goes up from 350 up to 390.
                                Good. That means at least the APFC circuit is working and that none of the main power-handling components are shorted.

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