Quoted from Rager170:
No, i really dont think so. What that does is it prevents humms and static noises from entering the speakers. Personally, I dont think thats your issue but it could be. You just never know with these things.
I had an issue like yours and it ended up being that the RCA's for the audio got weird. A little wiggly push in to secure the connection to the CPU metal box fixed it. Then when i lowered the playfield, it happened again. So I went back and again, secured them best I could and its stayed fixed.
This was just my experience but as mentioned, it could be other things. You just never really know.
Thanks so much for your help. So, I disconnected the 3.5mm cable from the port going into the metal box, and disconnected the ground isolator, went to plug it all back, then realized there are 3 3.5mm ports, green blue and pink and i didn't look before i plugged it back in so then there was no sound at all. lol. so i plugged everything back in, including the isolator, it worked. lol go figure.
I thought since the port in the metal box was pink, i thought it should plug into the 3.5mm pink port leading into the box but it worked when i plugged it into the blue port.
either way, it appears to be working an wouldn't have figured it out without your help so thank you so much. stay safe out there!