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Arcade Collecting => Miscellaneous Arcade Talk => Topic started by: BDAVIS on December 11, 2006, 04:50:24 pm

Title: MORTAL KOMBAT II SPEAKER BUZZ
Post by: BDAVIS on December 11, 2006, 04:50:24 pm

I am a complete Newb.  I just got a MKII game for Christmas.  It is in great condition.  The only problem is I have a speaker buzz that wont go away.  It gets worse when there is white on the screen (?!). 

I checked and all my ground wires appear to be fine.  I would greatly appreciate any help..Im lost.  :dunno

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: tommy on December 12, 2006, 09:36:31 pm

It could be bad pcb, it could also be some radio interference somewhere, it's hard to say from here.

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: _) (V) (-) on December 13, 2006, 08:16:45 am

Does it sounds like 60 cycle hum? (The type you'd get from ungrounded equipment)  Or does it change frequency? (ramp up or down)

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: BDAVIS on December 13, 2006, 08:28:01 am

Well, it gets worse depending whats on the screen (?!).  For example, when "Midway Presents" comes up it's worse.  Somebody suggested it may be my marquee light.  I took the bulb out but I didnt actually unhook it.

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: RayB on December 13, 2006, 03:55:46 pm

Housefly?

 :laugh2:

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: BDAVIS on December 13, 2006, 04:28:56 pm

Nice one...I wish it was, I at least know how to stop that.

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: Q*Bert_OP on December 13, 2006, 05:18:20 pm

It Sounds...hehehe...no pun intended...well...I think your power supply might have AC ripple?

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: SirPeale on December 14, 2006, 07:15:35 am

If you unplug your monitor do you still hear the sounds?

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: BDAVIS on December 14, 2006, 03:57:35 pm

Thanks for the suggestion.  Im going to try that tonight.

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: tommy on December 18, 2006, 11:11:07 pm

Also check that the mainboard wires are fully seated in the sound board (power and ribbon). That's kinda obvious but worth a look.

Maybe also make sure all Roms are firmly seated and the main board second half PCB is connecting on all pins. I had a graphic problem from that half board on the main board not fully connected.

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: BDAVIS on December 19, 2006, 12:28:44 pm

I unplugged my monitor and still had the buzzing noise.  I am going to look over the boards and chips again to..I may have overlooked something.  I have a new board coming, I wanted a backup.. :censored:

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: _) (V) (-) on December 19, 2006, 01:07:43 pm

Power supply perhaps?

I've known transformers to buzz sometimes.


Don't know why but I just got this image of
Optimus Prime drinking a case of Bud!

Title: Re: MORTAL KOMBAT II SPEAKER BUZZ
Post by: BDAVIS on December 19, 2006, 01:33:47 pm

 :laugh2:

Thats great. 

How difficult is a power supply to change?  If I keep going like this I will have a completely new game...over what's probably a bad ground.