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Main => Main Forum => Topic started by: Caldwaller on September 21, 2018, 07:57:00 am

Title: Weird speaker crackle after replacing the speakers..
Post by: Caldwaller on September 21, 2018, 07:57:00 am
I've been fixing up a SFII Turbo cabinet, (bought some art work from the vendor section) and 1 speaker worked, the other was dead.. I replaced them both with the exact same brand and model speakers, and they work fine for about 5 minutes and then start crackling and going on and off..

Everything is wired the same, I've double checked to made sure all the earths are still there, as far as I can tell literally the only difference is the speakers.. so I have no idea, and hoping someone else might..

Any ideas would be appreciated thanks.
Title: Re: Weird speaker crackle after replacing the speakers..
Post by: baritonomarchetto on September 22, 2018, 02:02:15 pm
Maybe you swapped - and + on one of the two speakers?
Title: Re: Weird speaker crackle after replacing the speakers..
Post by: Caldwaller on September 24, 2018, 12:31:19 pm
Maybe, I'll give it a looky..

Thanks.
Title: Re: Weird speaker crackle after replacing the speakers..
Post by: Caldwaller on September 27, 2018, 11:45:49 am
Turns out it only likes one speaker.. One speaker plugged in, works fine.. both crackling.. so it's half sorted
Title: Re: Weird speaker crackle after replacing the speakers..
Post by: Game_Dr on September 27, 2018, 09:43:17 pm
Quote from: Caldwaller on September 21, 2018, 07:57:00 am
I've been fixing up a SFII Turbo cabinet, (bought some art work from the vendor section) and 1 speaker worked, the other was dead.. I replaced them both with the exact same brand and model speakers, and they work fine for about 5 minutes and then start crackling and going on and off..

Everything is wired the same, I've double checked to made sure all the earths are still there, as far as I can tell literally the only difference is the speakers.. so I have no idea, and hoping someone else might..

Any ideas would be appreciated thanks.

If one speaker was bad and it only started doing the crackle after 5 minutes go straight to the audio amp IC.

Turn on the game and let it start to crackle. Turn a can of air upside down so you get the liquid and shoot the IC with a 2-3 second burst. If the crackle disappears then you have a bad audio amp IC which is not uncommon in a speaker failure.

Be aware having a metal can inside a live cabinet...   :dizzy:
Title: Re: Weird speaker crackle after replacing the speakers..
Post by: Jverive on September 28, 2018, 08:27:22 pm
This sounds like a bad coupling capacitor, so check those too (if the amp uses them, of course). Otherwise I agree that the audio amp IC (or transistor driver or other thermally sensitive device in the audio path) is suspect. Also check power supply voltages.