MV-4F - hissing

HornheaDD

Shigen's Fitness Trainer
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Mar 22, 2016
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Ive got some noticeable hissing, even with low (or 0) volume on my 4 slot. It's definitely not the cab's speakers, as when other boards are plugged in, there is zero hiss.

I'm not sure what could cause this, or if it's an easy repair. Im at work so I can tear it apart and take pics but I can later this evening if anyone needs info.
 

lachlan

drunk downunder!, aka. Muff Diver.,
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Feb 13, 2005
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Does it change at all if you adjust the volume slider?
 

HornheaDD

Shigen's Fitness Trainer
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Does it change at all if you adjust the volume slider?
Actually, yes it does. I didnt realize it until just now. If I slide it to higher volume, the hiss gets louder. Not necessarily more intense, just like.. im raising the volume on the hiss lol
 

zed7

Twinkle Star Sprite
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May 9, 2020
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Would you be able to supply a video? I believe that could help others figure out your issue. If you have an smkdan diag. bios or cartridge, i'd try that out
 

lachlan

drunk downunder!, aka. Muff Diver.,
Joined
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Posts
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Actually, yes it does. I didnt realize it until just now. If I slide it to higher volume, the hiss gets louder. Not necessarily more intense, just like.. im raising the volume on the hiss lol
I was thinking maybe it was the volume slider, I've had a couple that introduce noise when in certain spots. A bit of cleaning and lubrication tends to fix it. But if it's a constant uplift in the volume of the noise with the slider it's just amplifying whatever is introducing the noise.

Maybe bad caps? I'm certainly no expert.
 

HornheaDD

Shigen's Fitness Trainer
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I was thinking maybe it was the volume slider, I've had a couple that introduce noise when in certain spots. A bit of cleaning and lubrication tends to fix it. But if it's a constant uplift in the volume of the noise with the slider it's just amplifying whatever is introducing the noise.

Maybe bad caps? I'm certainly no expert.
For sure, I'll try to get some later today, if not I'll have to wait til after work.
 

HornheaDD

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:(

I am totally not a solderer. If I do that I guarantee I'll ruin my board.
 

lachlan

drunk downunder!, aka. Muff Diver.,
Joined
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17,271
:(

I am totally not a solderer. If I do that I guarantee I'll ruin my board.
Maybe there is someone you can ship off the bottom board to? Even if you are good with an iron these boards are a pain in the ass to cap.
 

Digmac

Official NG Youngun
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Feb 10, 2016
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1,813
Maybe there is someone you can ship off the bottom board to? Even if you are good with an iron these boards are a pain in the ass to cap.
Seconded. Old SNK solder pads have a habit of lifting easily, so I’d see if a forum member here can give you the homie hookup on getting this sorted out. Maybe Big Bear can help you out? I know he’s rock solid at repairs.
 

HornheaDD

Shigen's Fitness Trainer
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Mar 22, 2016
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I sent a quote request to ChannelManiac at arcade components.com

I guess we'll see what happens there :/
 
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