(Topic ID: 162442)

Tech WPC 89 Sound Issue

By DocRotCod

2 years ago

Topic Stats

  • 4 posts
  • 2 Pinsiders participating
  • Latest reply 2 years ago by DocRotCod
  • Topic is favorited by 1 Pinsider


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    #1 2 years ago

    I am working on a wh20 and the gi wires had been clipped on the old transformer but otherwise the game was working fine.

    I located from a reputable source another transformer and it arrived today.

    The input plug had some of the housing broken off so I replaced the connector (pin by pin to make sure it was right).

    Flipped on the game and while everything appears to come up (DMD says testing, CPU is blanking, driver board shows all voltages present), then this hellacious sound almost like a reverb or something comes out of the speakers and you cannot turn it down or anything. No fuses pop or smoke or anything other than that sound.

    Any ideas appreciated.

    #2 2 years ago

    Ok so I have confirmed transformer I received has an issue as I tried the transformer from my Getaway and game works fine.

    However, during the process of installing the replacement transformer, my sound card now does not work. It has a loud hum (not like the sound before, but just a loud hum with no audio). If I try sound card from Getaway it works fine. wh20 ROMS are tested ok.

    Any ideas on sound card issue?


    #3 2 years ago

    You may have fried the amplifier on the sound board. No real way to tell without having it in hand.

    #4 2 years ago

    Ok as an update to this thread:

    Replacement transformer blew out my sound card. I just repaired the sound card.

    2 x burned traces on backside of sound card.

    Blown u5 deals with volume up/down

    Blown YM3012 DAC causing distortion in audio.

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