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Thread: Genesis 1 Headphone Output Unreliable

  1. #1
    Raging in the Streets Blades's Avatar
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    Default Genesis 1 Headphone Output Unreliable

    The 3.5mm jack on my model 1 is getting a little unreliable. I'm assuming it's cold/cracked solder. Is it a simple resoldering job? I've never opened a Genesis before.

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    Hedgehog-in-Training Hedgehog-in-TrainingWildside Expert
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    If it is a cold solder joint, then yes, it's very simple. The headphone jack is connected to the main board by 3 solder points, you'd just need to go over all six of those. It might be that the contacts are just dirty, however, so get hold of some contact cleaner and give them a good spray down.

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    Raging in the Streets Blades's Avatar
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    Sounds good, will report back.

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    Road Rasher ironnick23's Avatar
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    Also try a different aux cord

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    Raging in the Streets Blades's Avatar
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    I was wrong, soldering is solid. The ground noise comes and goes and appears to be coming from the circuitry. No effect by physically doing anything. Caps? Original HDG model 1 here.

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    Road Rasher ironnick23's Avatar
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    Aux ports fail. Do you notice a change when using a different aux cable or wiggling the cable? Alternatively, have you tried a different tv or power supply?

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    Raging in the Streets Blades's Avatar
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    No change. The ground noise can be heard simply by plugging in headphones to the jack.

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    Road Rasher ironnick23's Avatar
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    Do you get this sound when outputting audio from the rear port?

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    Raging in the Streets Blades's Avatar
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    Wow, the audio from the rear port is terrible. To test this, I just turned on the system and waited for the Sega CD music to start playing. If I removed the connecting 3.5mm cable and listened to only the SCD output, the ground noise goes away completely.

    I just tested it however, and the ground noise is gone from both ports. So it is definitely conditional on something. I'm not using any shielding plates, that might be it.

  10. #10
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    Quote Originally Posted by Blades View Post
    Wow, the audio from the rear port is terrible. To test this, I just turned on the system and waited for the Sega CD music to start playing. If I removed the connecting 3.5mm cable and listened to only the SCD output, the ground noise goes away completely.

    I just tested it however, and the ground noise is gone from both ports. So it is definitely conditional on something. I'm not using any shielding plates, that might be it.
    I wouldn't think the plates are the main cause.

    I've used a SEGA CD both with and without the plates and didn't really notice any difference. Does the Genesis audio alone sound this way when the SEGA CD isn't even connected?
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    Road Rasher ironnick23's Avatar
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    What I mean is the video cable you use to connect the Sega to your television, use the audio from that port and see how it sounds. You havenít mentioned if you tried a different 3.5mm cable either. Testing those two things will isolate the issue to the console and narrow which part of the circuitry it could be. What revision is your board? Have you removed all the shielding and taken the board out of the case completely and tested it then?

  12. #12
    Raging in the Streets Blades's Avatar
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    FWIW I can't reproduce the tone at all now. If/when it comes back I'll do the tests you guys mentioned.

    What revision is your board?
    VA6.

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    Road Rasher ironnick23's Avatar
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    Sounds like you had a short that corrected itself when moving everything around. Itís possible either the aux cable or the cables connecting your jack to the board are in need of a replacement. Or the rf shielding was touching something it shouldnít.

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    AKA Mister Xiado Master of Shinobi Raijin Z's Avatar
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    The jack itself could be screwy. I would try soldering another jack on top of it, in parallel, to see if it's the original jack, or something else in the audio chain that's going bad. If the jack is borked, it can be replaced.
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  15. #15
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    So the noise happens only if the Sega CD is connected. Doesn't matter if the Genesis is in Genesis mode or Sega CD mode.

    Unplugging the Sega CD (while the Genesis is playing a cartridge) makes the tone louder (quite loud). Plugging it back in drops the tone back to normal levels.

    Next step is to test the rear output. My guess is it'll be there. It's some kind of interference with the SCD it seems.

    I don't have the Sega CD shield plates. Is it possible to make some makeshift shields out of tinfoil or something similar to test if the tone is affected?

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