Arcade sound issues? MORTAL KOMBAT

[ddstoys]

Hey guys On my way! Finally getting the last pieces of my mortal kombat cabinet together but have a sound fault?

  On power up the game has that white noise fizz. But when you start a game all sounds are present but still with the static?

    Any pointers before I pull the board out?

[Retropin]

Sounds like its not grounded

[Homepin]

Sounds like its not grounded

....or dodgy caps - ask on AA, there are some pretty serious experts that dedicate themselves to this type of stuff.

[Marty Machine]

The white noise/fizz sound is very typical of the audio amp chip dying, typically a 5pin, 7pin (or more)..

Without knowing (or seeing) the schematic, that's my first thing to look at......maybe find the audio IN to that chip and listen to it to see if it's clean going into the amp to confirm.

Otherwise, it could still be any part of the chip(s) that make up various oscillators/noise-generators elsewhere.

MM

[ddstoys]

All good advice ill follow them up tomorrow also think it may be the EPROMs or the background sounds EPROM found a sound board test in the menu and two of the 4 tests don't work.

  Check it out tomorrow FINISH HIM

[ddstoys]

Thanks guys I replaced the roms and while I was I bumped the crystal which was held on by one leg replaced it and now I finally have a mortal kombat cabinet

[Marty Machine]

Nicely done...

So, were the original roms actually faulty then? i'm guessing only the crystal was to blame?

MM

[ddstoys]

I havnt verified the original roms yet but in sure bit was the crystal

[Strangeways]

Nice original game, Daniel 

[ddstoys]

Nice original game, Daniel 

Thanks Niño

  I've had the control panel buried in my stash for years it was the best one if seen with only a couple of tiny chips of the edge of the artwork and slowly collected the parts I needed to complete it.   Don't know where I'm going to fit it but hell why not

[ktm450]

Looks great mate 
If you need somewhere to store it I'll babysit it for you 

[ddstoys]

You and Timbo can take turns ;)