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Sarge
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Sega Genesis audio crackle

by Sarge Tue Mar 22, 2016 10:17 am

So y'all are probably familiar by now with my Genesis recap project. I figured I'd be able to get rid of the audio crackle (similar to the sound that you get on an old set of speakers when you adjust the volume) by recapping, but no dice. So any other ideas as to what might be going on? Could it be the chip itself? Or is there another component that would be worth changing out?

I'm pretty sure it's not the power supply, I've tried two different ones with the same result, and I've also used the same supplies on my other two Genesis consoles with no issues. The crackle also shows up on both the multi-out and the headphone jack, so it's something common to both those circuits.
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samsonlonghair
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Re: Sega Genesis audio crackle

by samsonlonghair Tue Mar 22, 2016 10:40 am

Could you post a high-res photo of the genesis innards, please? We can always take a look and see if anything looks suspicious.
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Ziggy587
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Re: Sega Genesis audio crackle

by Ziggy587 Tue Mar 22, 2016 10:58 am

+1 to the pics suggestion.

What power adapter are you using to power the console? The reason I ask is that I once used a shitty power adapter (had the right specs - it was just a cheapo) with a HDG model 1 Genesis and got very bad audio. My memory is fading of what it sounded like, but I wouldn't use "crackling" to describe it. It sounded more like blown speakers. But at any rate, switching to a better brand power adapter completely fixed the problem.
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Sarge
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Re: Sega Genesis audio crackle

by Sarge Tue Mar 22, 2016 11:10 am

I'll see if I can't snap a pic when I get home.

They're both official Genesis power supplies. Used 'em for years with both the Sega Genesis and CD.

I'm not sure the right word is "crackle", either. It's kinda similar to the sound when you, say, hook up a set of headphones to an audio jack, a kind of staticky sound. It's not constant, though, there's a low level noise in the background, and every once in a while, it pops more loudly. Actually, it's more like a radio station that's right on the edge of a good signal, it's mostly okay, but with a low-level static sound that will pop every now and then.
Last edited by Sarge on Tue Mar 22, 2016 11:15 am, edited 1 time in total.
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samsonlonghair
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Re: Sega Genesis audio crackle

by samsonlonghair Tue Mar 22, 2016 11:13 am

Ziggy587 wrote:+1 to the pics suggestion.

What power adapter are you using to power the console? The reason I ask is that I once used a shitty power adapter (had the right specs - it was just a cheapo) with a HDG model 1 Genesis and got very bad audio. My memory is fading of what it sounded like, but I wouldn't use "crackling" to describe it. It sounded more like blown speakers. But at any rate, switching to a better brand power adapter completely fixed the problem.

Sounds like you're describing "dirty power sound" which is an issue I run into during mobile DJing sometimes. I can usually trace it to a grounding issue. If the power supply is not grounded properly, it can cause a "dirty" sound in the speakers. High power speakers are more susceptible to this than low power speakers.
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Exhuminator
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Re: Sega Genesis audio crackle

by Exhuminator Tue Mar 22, 2016 11:16 am

I wonder if the Genesis shares a central DAC between all its audio components.

I'm trying to think of a central culprit.
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Sarge
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Re: Sega Genesis audio crackle

by Sarge Tue Mar 22, 2016 11:18 am

Maybe I should try reflowing the power connector, could be that it's developing an issue there?
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Ziggy587
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Re: Sega Genesis audio crackle

by Ziggy587 Tue Mar 22, 2016 11:31 am

I know you said the problem occurs in both the multi AV output and headphones output, but have you ruled out bad cables?
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My Sale Thread - PRICES REDUCED! I am selling around three quarters of my video game collection as well as some other odds and ends!

I want to buy Universal Game Cases, if you have any spares please PM me! I'm looking to only deal with members that have good BST feedback on this forum.
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Sarge
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Re: Sega Genesis audio crackle

by Sarge Tue Mar 22, 2016 11:32 am

Yeah, same cables work fine on my other Model 1s.
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Sarge
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Re: Sega Genesis audio crackle

by Sarge Tue Mar 22, 2016 7:21 pm

Okay, here's some pics. Some aren't the best, but it might be enough. I'm not seeing anything that jumps out at me at first blush, but maybe y'all have better eyes for this than I do!

You can ignore the one trying to shoot under the heat sink, I decided to just go ahead and pull it off. That should be the last pic in the set.

http://imgur.com/a/WZW5d
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