M31 Series CGA/EGA/VGA Monitor (Wei-Ya/Huai Electronics) - Buzzing

[FrancisLillie]

Hi all,

My first post on here, so go easy please.  I did a quick search, but couldn't see a problem/solution.

I recently purchased a Big Century arcade cabinet from arcadecabinets.co.uk (an Ultimarc site) along with a Jpac and a PCI-E ArcadeVGA card.  I plugged it all in today for the first time and powered it up.  To begin with, without the PC turned on, the monitor made a bit of a high pitched whine, which died down, but did not completely disappear, but I thought this was fine, as I seem to recall you do get a bit of a whine with monitors/TV's.

When I switched the PC on though, the monitor started to make a sort of buzzing noise.  The picture was absolutely fine.  If I had to describe the sound I'd have to say it was like a short click, and it sounded like it was repeated at 50Hz - 60Hz, so I'm guessing it's linked to the output from the ArcadeVGA card.

My question is, is this normal?  I waited for the PC to boot up, and then shut down without running MAME, just in case I was damaging the monitor at all.  Even when it got to the 640x480 desktop it was still "buzzing", and I thought this monitor would run 640x480 fine.

Any help anyone could give on this, or any information they could supply would be greatly appreciated.  I have also emailed Andy at Ultimarc (about 10 minutes ago) but have had no reply yet (obviously, given the time frame), and thought I'd ask elsewhere.

Thanks,
Francis Lillie

[FrancisLillie]

You know what?  As a software developer of 19 years I should bloody well know better how to trace problems.  It turns out it's nothing to do with the monitor at all and seems to be a speaker issue.  I apologise if I've wasted anyone's time.  Too eager to get it all working, that's what I am.

[qrz]

 it is worth a look to see how/where the audio lines are ran.
quite possibly an interference issue -might try ferrite cores if no change by moving wires...
it would be helpful to hear what your hearing .....


gud luck de qrz