(Topic ID: 291461)

Weird DCS sound board issue

By ravve

3 years ago



Topic Stats

  • 9 posts
  • 5 Pinsiders participating
  • Latest reply 3 years ago by Kare9
  • No one calls this topic a favorite

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    #1 3 years ago

    Having issues on a DCS soundboard, need some advise here!
    Symptom: Board is working, but sound from backbox speakers is "noisy", listen to THIS:

    https://soundcloud.com/rawad-azar-630513522/dcs-sound-board

    - Verified that the issue is within the board itself, since it follows the board when put in another game (swapped sound roms also, so issue is not in the roms).
    - Followed Pinwiki and replaced C32 and C41, also cut C37 and C45, but issue remains.
    - Compared some measurements with another working board (diode tested roms, continuety, resistors) and they all seemed fine.
    - Measured the 2 big 10.000 uf caps C20/C21 with an ESR meter, seemed similar to the working board.

    Any thoughts what to do next? As said, I have another working board to compare with, but really don´t know what to look for more.

    #2 3 years ago

    No reply? Nobody that has experienced similar issues with the sound?
    Should I suspect the two big caps even though they measured fine, or is there something else I should look for first?

    #3 3 years ago

    How is your power supply, it may show 5V or 12Vdc but you need to check the ac-part. Have you tested the board out of the pinball with a good powersupply and speaker?

    #4 3 years ago
    Quoted from PinMario:

    How is your power supply, it may show 5V or 12Vdc but you need to check the ac-part. Have you tested the board out of the pinball with a good powersupply and speaker?

    I have verified that the issue is within the sound board. When moving sound board to another machine, the issue follows to the other machine.

    #5 3 years ago

    Sounds very similar to what I had happen on my DCS game. See my post in the following thread:
    https://pinside.com/pinball/forum/topic/distorted-sound-wpc-dcs#post-5940645

    1 week later
    #6 3 years ago

    The big caps are most likely the issue. You've had c52 leak, I wouldn't trust anything electrolytic on that board. Use flux and a hot iron, a good solder deputter and a bit of braid. Keep the iron hot and aim for quick action on the big cap joints, once all/most of the solder is cleaned from the holes gently wiggle from the top if you need to, sometimes they'll just fall out if you've cleaned the holes nicely.

    #7 3 years ago
    Quoted from Kare9:

    The big caps are most likely the issue. You've had c52 leak, I wouldn't trust anything electrolytic on that board. Use flux and a hot iron, a good solder deputter and a bit of braid. Keep the iron hot and aim for quick action on the big cap joints, once all/most of the solder is cleaned from the holes gently wiggle from the top if you need to, sometimes they'll just fall out if you've cleaned the holes nicely.

    Plus 1

    2 weeks later
    #8 3 years ago

    Update: replaced all of the caps (not the mini yellow ones), including the 2 big ones.
    Problem still the same.

    Should I just live with it?

    1 week later
    #9 3 years ago
    Quoted from ravve:

    Update: replaced all of the caps (not the mini yellow ones), including the 2 big ones.
    Problem still the same.
    Should I just live with it?

    Oh those must be the tantalum caps and could absolutely be the issue man. I know it may be futile but try replacing those as well - they have been known to cause issues on the first version of the dcs sound board.

    Maybe search it up, I think on the early dcs boards you can clip them off instead of replacing them - it is a well documented fix on Pinside.

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