triple bypass on MD2 VA1 wierd background music, 3BP problem ?

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  • July 5, 2020 at 12:00 PM #39525
    evilsim
    Participant

      https://www.dropbox.com/s/3go1qd5djawntqv/MD2_VA1_3BP_umm.mp3?dl=0

      Above is a MP3 file I recorded from the MD2, Street Fighter 2 audio.

      I bought about 6 triple bypass boards (from VGP website) and only this one is being weird. Please let me know if anyone has any ideas on how I can fix this. I have triple checked my install. This is about my 5th 3BP install (after many megaamp installs in the past) and the first problem I’ve ever had.. The RGB works great, audio is wierd.

      Using ASIC YM3438 and have confirmed resistors are correct for that model.

      Thanks in advance for any help. Happy to provide pics of install but shouldn’t be necessary as its all been re-checked with multimeter.

      EDIT: I just installed another of exactly the same (3BP into a different MD2 VA1) and it works just fine…

      September 3, 2020 at 11:40 AM #41214
      evilsim
      Participant

        cool forum, thanks for the replies everyone

        I ended up firing up my hot air gun and re-flowed ALL the solders on the whole 3BP PCB – and it was fixed.
        ALso thanks for VGP for not properly testing the board which must have had a bad solder somewhere

        September 20, 2020 at 11:15 AM #41421
        BuckoA51
        Keymaster

          If your board is faulty then I’m happy to exchange it for you, but there’s no way to test for this without actually installing it that I’m aware of.

          September 20, 2020 at 12:16 PM #41427
          evilsim
          Participant

            If your board is faulty then I’m happy to exchange it for you, but there’s no way to test for this without actually installing it that I’m aware of.

            BuckoA51 thankyou for that, but yes you would need to install to test (or probe the entire thing with multimeter and a schematic) ! Its fine I got it going in the end and the person who owns that 3BP’d MD2 is very pleased with it.

            September 22, 2020 at 10:15 AM #41458
            BuckoA51
            Keymaster

              Ok, in those sorts of situations I would of course give you the benefit of any doubt.

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