Bad caps on an M-audio DSM2 power supply

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • Umbrella Corp
    Member
    • Dec 2015
    • 26
    • USA
    #1

    Bad caps on an M-audio DSM2 power supply

    Attached is a picture of my board from my speaker. Does it looks like a capacitor blew? It also looks like it damaged some of the transistors.

    Oddly, it still works, but is standby mode for about five minutes then begins to work. It used to come on instantly.


    BTW, this board helped me with an LG plasma about five years ago and it is still working!
    Attached Files
    Tags: None
    • PeteS in CA
      Badcaps Legend
      • Aug 2005
      • 3581
      • USA, Unsure of Planet
      #2
      Re: Bad caps on an M-audio DSM2 power supply

      The stuff atop C31 looks like glue, possibly to stabilize the resistor that looks like it was added in parallel with another resistor. That glue apparently tends to get conductive as it ages and is browned by heat. Q4 looks like it has some glue on top of it, too. However, there is what looks like a liquid the leaked and flowed onto the PCB.

      If you're really concerned about what can be seen in the picture, I'd clean off the glue and then figure out what that brownish substance is on the PCB.
      PeteS in CA

      Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
      ****************************
      To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
      ****************************

        Comment

        • Per Hansson
          Super Moderator
          • Jul 2005
          • 5895
          • Sweden
          #3
          Re: Bad caps on an M-audio DSM2 power supply

          Between the marks RB20 and RB14 on the PCB there is a resistor with a hole in it: might be worth investigating further
          "The one who says it cannot be done should never interrupt the one who is doing it."

            Comment

            • Umbrella Corp
              Member
              • Dec 2015
              • 26
              • USA
              #4
              Re: Bad caps on an M-audio DSM2 power supply

              Thanks, PeteS, that helps. They have the powerboard glued to the base of the cabinet, so I gave up this morning trying to get it out.

              What's really odd is that I run these speakers upside down so the tweeter is closer to my ear—which also puts the circuitboard above the caps. Can't figure out how anything would have seeped out upwards against gravity.

              I'll work on it. I appreciate your reply.

                Comment

                • Umbrella Corp
                  Member
                  • Dec 2015
                  • 26
                  • USA
                  #5
                  Re: Bad caps on an M-audio DSM2 power supply

                  Yep, Per Hannson, I saw that. I may have to work that board out and take it an electronics repair shop. I'm looking for a replacement before I do that since the speakers are still working.

                  Thanks.

                    Comment

                    • Umbrella Corp
                      Member
                      • Dec 2015
                      • 26
                      • USA
                      #6
                      Re: Bad caps on an M-audio DSM2 power supply

                      Thought I'd update. It was actually the capacitor at C27 on the right hand of the board. It looked perfectly fine to the eye, but others who had this problem said that was the one to replace. So I swapped it out and the speaker is working fine again.

                      Thanks for all of your help here.

                        Comment

                        • sam_sam_sam
                          Badcaps Legend
                          • Jul 2011
                          • 6059
                          • USA
                          #7
                          Re: Bad caps on an M-audio DSM2 power supply

                          If it were me and I was repairing this I would recommend doing a full capacitor replacement because if are not good quality capacitors you might be repairing this again

                            Comment

                            • Umbrella Corp
                              Member
                              • Dec 2015
                              • 26
                              • USA
                              #8
                              Re: Bad caps on an M-audio DSM2 power supply

                              I'll keep that in mind, sam_sam_sam. Now that I was able to remove it from the case (had to dremel it out) pulling it out next time will be a cinch.

                              Thanks.

                                Comment

                                Previous template Next

                                Related Topics

                                Collapse
                                • Tynan Dill
                                  Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                                  by Tynan Dill
                                  I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                                  Upon bringing it home and plugging it up, it showed a standby light.

                                  I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                                  The screen seems to blackout and stay black, but with a flashlight I can see the display.

                                  With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                                  Assuming...
                                  ORIGINAL POWER SUPPLY BOARD
                                  7 Photos
                                  11-22-2024, 01:46 PM
                                • eryjus
                                  Heathkit IO-4205 Power Supply Caps
                                  by eryjus
                                  Hello,

                                  First, I am a complete noob with high voltage stuff. I'm learning, but I need help by someone looking over my shoulder.

                                  I recently came into posession of a Heathkit IO-4205 5MHz Dual Trace Oscilloscope. The documentation is copyright 1978. I'm told it works.

                                  I opened it up to check the caps before I applied power, and found the following black caps and wanted to know what they were. They are on the power supply board. I was able to read the name and model and came up with, "Nytronics 162J-1, 0.1uF, 20% tolerance, 2000VDC."
                                  ...
                                  05-10-2023, 11:21 AM
                                • captain150
                                  Help with switching power supply caps
                                  by captain150
                                  I'm trying to repair two old VCRs, they both have bad caps. One has leaky ones, the other would barely run until I subbed in some caps from another power supply I had laying around (though they are the wrong values). This vcr works for an hour or two, but then the power supply starts whining and the picture gets lines in it. I didn't replace all the secondary caps, so another voltage might still be problematic, or the values I used are too far off.
                                  I've been on mouser and digikey but the options are a bit overwhelming. I just need some new ones that will work. They don't need to be top quality,...
                                  03-16-2025, 07:34 PM
                                • sam_sam_sam
                                  Desoldering gun station modified to use a 18 volt @ 20 amp switching power supply
                                  by sam_sam_sam
                                  I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump

                                  One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
                                  03-31-2024, 02:12 PM
                                • sam_sam_sam
                                  Modification to a ZD-987 desoldering/soldering station using a external switching power supply
                                  by sam_sam_sam
                                  I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails

                                  I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time...
                                  07-01-2024, 06:34 AM
                                • Loading...
                                • No more items.
                                Working...