Donkey Kong recapped monitor has background hum and alarm sound

[tomstewdevine]

VWA, you are tenacious! Get it homie.

[vwalbridge]

VWA, you are tenacious! Get it homie.

Thanks man! I need all the encouragement I can get. I didn't ever think I would be in this deep when I got this machine. But then again, this is how you learn. Get your hands dirty.

[harveybirdman]

you didn't reroute any wires in this process did you?

[vwalbridge]

you didn't reroute any wires in this process did you?

Actually yes.     I've pretty much got every wire hanging all over the place in the cab right now. Perhaps one of the audio wires is getting interference?

I did double check that my monitor frame and speaker were grounded. The audio PCB is on the monitor frame and gets its power from the monitor. Hmm.

[yotsuya]

Bring the chassis to ZapCon. Problem solved.

[vwalbridge]

Bring the chassis to ZapCon. Problem solved.

Ya know, by the time I'm done....buying a plane ticket for this chassis to ZapCon will probably be cheaper! 

[harveybirdman]

you didn't reroute any wires in this process did you?

Actually yes.     I've pretty much got every wire hanging all over the place in the cab right now. Perhaps one of the audio wires is getting interference?

I did double check that my monitor frame and speaker were grounded. The audio PCB is on the monitor frame and gets its power from the monitor. Hmm.

Look I'm just a dumb ass from Oklahoma that has all of one arcade monitor in his possession, but it seems like I've read something about distortions caused by wire proximity.

However, if it does turn out to be something along those lines I'm going to pretend I'm the Dr. Greg House of Arcade monitor differential diagnosis.

[jennifer]

    I cant with good conscious tell you to probe that flyback, But isolating the pcb from the chassis may tell the same story.... you really, really, really need to get yourself a scope, not just "ya I"ll look into that" But really really look into that....Really.

[lilshawn]

I bought an older Tektronix oscilloscope from the government surplus for 40 bucks. probes and all. Came from one of the technical schools. don't need no fancy rigol 5101 or 2 gigasamples per second whatever... just a simple 10 or 15mhz cathode ray scope is more than ample. all you need to do is see what's going on. even if you use it twice, the frustration it will save you is worth way more than 20 bucks.

oh look 5 volts!

yes, but it's dirty as hell.

[jennifer]

     I get so jealous of those digital rigol guys apparently the refresh rates are right up there, it does all the calculations for you, and cost/features seems quite competitive, I bet a smart monkey could use one... As for Jenn, Analog is all I have ever known, my little Phillips has not only a battery pack for portability, but also a floating ground, kinda uncommon as far as scopes go. The big fancy Leader sits there looking all superior and watches, but only comes to play when doing complex multi trace projects... Not counting recalibration, parts/probes, I only have just over $100us into both of them. 

[lilshawn]

my little Phillips has not only a battery pack for portability, but also a floating ground, kinda uncommon as far as scopes go.

oooooo fancy. I would love a portable unit. I used to use a fluke scopemeter at my old job. damn I miss that thing. The refresh rate on the LCD was horrible (90's tech) but at least you could see what was going on.

The company I was working for was starting to go under, so I left. Should have stole it.

[SUPA_FRANKY]

Hey, so I know it's been years since an update but I'm having the same issue. I get that humming siren like you do. Also mu sound effects like Marios walking is loud as hell and can't be lowered while music can. We're you able to fix it?