Snes - Audio Problem

[demiangreenday]

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 won´t turn on when powered on).

Today, i decided to fix it!
After a little research i´ve 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.
I´ve tried DKC 1, same problem. No sound - just constant loud buzzing.

- i´ve cleaned both cartidriges.
- I´m using the a/v cable from the Gamecube (i´ve 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.
- I´m using a generic ac adapter - can this be the problem?

i´ve 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?

Thank you for reading and i´m very sorry for my english.

[demiangreenday]

i´ve uploaded a video to youtube so you can see the problem

[Hobie-wan]

I'd start by blaming the generic adapter, yeah. Try to at least use a real one to test it.

[demiangreenday]

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 don´t 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!

[Hobie-wan]

Is this an older model with the separate sound module? If so maybe pop that off and clean the contacts there too.

[demiangreenday]

nope, it is the newer model without the sound board.
maybe the voltage regulator 7085 isn't working?

[Ziggy]

If the voltage regulator wasn't working, the entire console wouldn't work.

Sorry I can't offer more right now, it's late, brain isn't in thinking mode.

[theclaw]

Have you tried an RF box? Maybe the a/v pins have worn out, not likely but...

[darkcat]

the buzzing makes it sound like there's a short to common from the audio signals. make sure the wire isn't chewed up. Buzzing 99% of the time is interference + or - of the HZ output .

[demiangreenday]

I think the problem may be the capacitors., so today i bought all the capacitors in my local hardware store.

Here´s the problem.

Here´s 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 i´ve 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, i´ve should have checked when i bought them.

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