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Thread: Snes - Audio Problem

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    Default Snes - Audio Problem

    Hello everybody.

    So, i decided to restore and repair a snes that I have gathering dust in a closet for 10 years.

    10 Years ago my snes stopped working (the light wont turn on when powered on).

    Today, i decided to fix it!
    After a little research ive realized that the pico fuse was blown up, so change it for a normal glass fuse of 1.5A.

    The console now turns on without any problems!

    Next stop: test a game! I insert Super Mario World, turn the console on and....nothing, black screen - no sound.

    So this is what I did,

    i opened the console again and cleaned everything with isopropyl Alcohol, cleaned the pin connectors (rusted), everything.

    Now, i insert the game, and it works almost perfectly, the game has audio problems, i hear a constant buzzing sound.
    When the game starts you can hear the buzzing and the music from the game but after a few seconds the music fades away and all i can hear is the buzzing.
    Ive tried DKC 1, same problem. No sound - just constant loud buzzing.

    - ive cleaned both cartidriges.
    - Im using the a/v cable from the Gamecube (ive tried on the gamecube and the cable works fine), so i can discard that.
    - The Snes model is the one that has the audio chip soldered to the motherboard.
    - Im using a generic ac adapter - can this be the problem?

    ive read that a generic ac adapter can cause glitches /lines on the video, but it can affect the audio too? This is my best shot.

    What do you think?

    ive uploaded a video to youtube so you can see the problem

    http://www.youtube.com/watch?v=SA5bRD4Tod0

    Thank you for reading and im very sorry for my english.

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    Alex (Level 15) Custom rank graphic
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    Quote Originally Posted by demianariel View Post
    - Im using a generic ac adapter - can this be the problem?

    ive read that a generic ac adapter can cause glitches /lines on the video, but it can affect the audio too? This is my best shot.
    Yes, that could be the problem. I had a Genesis that buzzed when using a replacement adapter, I tracked down a proper original adapter and it played fine. The system came with the replacement adapter when I bought it used.

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    Ok, i`ve got an update.
    Today I bought a working SNES Mini witch came with the official AC Adapter.

    i`ve connect the official ac adapter in my old SNES and now the constant buzzing noise is gone but still i dont have any audio.
    So, i'm thinking that maybe the problem are the capacitors.
    But which ones? i don't see any capacitor in bad state nor Sulphated.

    Any ideas?

    Thank you for your time!

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    Quote Originally Posted by demianariel View Post
    Ok, i`ve got an update.
    Today I bought a working SNES Mini witch came with the official AC Adapter.

    i`ve connect the official ac adapter in my old SNES and now the constant buzzing noise is gone but still i dont have any audio.
    So, i'm thinking that maybe the problem are the capacitors.
    But which ones? i don't see any capacitor in bad state nor Sulphated.

    Any ideas?

    Thank you for your time!
    If your unit is an early one you may have a bad SHVC Sound unit.

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    Cherry (Level 1) raylydiard's Avatar
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    I am finding a lot of the faults are caused by them electrolytic capacitors being 10 years or over all need replacing.


    All repairs i do i replace them in all consoles from 70s and up to the 90s consoles due to there being old now.
    and some


    If not all snes consoles i have had replace them when i inspect them boards if you see green crap on the legs replace them asap or the board will rust and all the traces will be gone for ever.

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    Quote Originally Posted by raylydiard View Post
    I am finding a lot of the faults are caused by them electrolytic capacitors being 10 years or over all need replacing.


    All repairs i do i replace them in all consoles from 70s and up to the 90s consoles due to there being old now.
    and some


    If not all snes consoles i have had replace them when i inspect them boards if you see green crap on the legs replace them asap or the board will rust and all the traces will be gone for ever.

    Ok, ill give it a shot even knowing that is going to be extremely difficult.

    this will work?

    http://console5.com/store/kits/game-...vc-models.html

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    Bad caps could very well be your problem.

    You said something bout the cartridge port being badly corroded... you make want to revisit that.
    Depending on the level of deterioration, you could either clean it with some Brasso and be good to go, or you could have a more serious problem and have to replace the port all together... if not the whole console.

    Good luck.
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    Yeah that kit will work fine

    If you need a other cartridge port i have some kicking around there cleaned a tested.


    Quote Originally Posted by demianariel View Post
    Ok, ill give it a shot even knowing that is going to be extremely difficult.

    this will work?

    http://console5.com/store/kits/game-...vc-models.html

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    Thank you very much guys!
    im gonna replace all the capacitors and if i still have the issue im gonna talk to you about that cartridge port raylydiard.

    i'll keep you posted!

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    New update.

    Ok, so i bought all the capacitors in my local hardware store.
    Heres the problem.

    Heres the list of all the capacitors of the snes.

    2.2uf 50v
    10uf 16v
    10uf 16v
    33uf 25v
    47uf 16v
    33uf 25v
    33uf 25v
    220uf 6.3v
    220uf 6.3v

    and this i what ive got:

    2.2uf 63v
    10uf 25v
    10uf 25v
    33uf 25v
    47uf 25v
    33uf 25v
    33uf 25v
    220uf 16v
    220uf 16v


    As you can see. the "uf" of all capacitors are correct. the problem is the "v". Some of them got the correct v, but most of them have higher v.

    i know, i know, ive should have checked when i bought them.

    The question is...im gonna have any problems by putting these capacitors of higher "v" in the snes? it may blow something?
    And another thing...what is "V"...it refers to voltage or maxmium voltage supported?

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    Cherry (Level 1) raylydiard's Avatar
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    The higher voltage is fine mate if not better for the console as for the uf must be the same.

    It would be great to hear a update once its fixed up.

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    Ok, guys...final update,

    Ive changed all of the capacitors and now the sound is working again! Thank you all for the help!

    im so happy! i cant believe that is working agian!...and it only cost me like 2 dollars.

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    Awesome!

    I've been thinking of doing this proactively on my consoles just to avoid issues. Leaky CAPs can be the death of a PCB. Where did you end up getting your CAPs from?
    Atari: 2600, Jaguar
    Microsoft: XBox, XBox 360
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    Sega: SMS, Genesis, Game Gear, Nomad, Sega CD, 32X, Saturn, Dreamcast
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    judging from the variety of discharge rates and the lack of variety of max voltages.... radio shack is my guess

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    Quote Originally Posted by Polygon View Post
    Awesome!

    I've been thinking of doing this proactively on my consoles just to avoid issues. Leaky CAPs can be the death of a PCB. Where did you end up getting your CAPs from?
    i bought them in a local electronics store. Turns out that the caps are pretty common.

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    Just to say i fixed someones famicon with extra audio box and recapped all sound was back picture is nicer i then used my home made snes burin test to make sure everything was fine.

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