Hi all,
I recently was fortunate enough to get my first arcade monitor, a Makvision / Wei-Ya M3129DF. Unfortunately this means I am pretty new to arcade monitors though not CRTs in general. This should be tri-sync on 15/25/31khz but I have only had success with 31khz so far. I'm testing it with GroovyArcade linux + GroovyMame. When running a 480p signal to it via HD15, on turning on power it will degauss, click once and display the image beautifully, no issues.
When I try to feed it 15khz via groovymame or a number of other esoteric options, on powerup, after degaussing, one of two things happens:
- We get one click (promising!) but no signal, black screen.
- We get a rapid clicking (~10-20hz?). The frequency of clicks is steady, but different video sources seem to produce different frequencies of clicking. To be clear, by frequency I mean how often it happens, not the tone.
[EDIT] Actually, it may be that when we see #2, it's actually just because groovymame crashed and we get dumped into linux's textmode which I presume is normal to produce this as it can't sync. I can't remember if this was the case last night when I was first testing it... I'm just realizing this now. So really the issues may be more with #1 and/or with the software.
I've mostly tried running with the "m3129" (should be correct!) as well as "arcade_15_25_31" and "m2929" monitor definitions.
I haven't done extensive testing of 25khz. I would be happy to try this out if anyone wants to throw out a title that will run at 25khz when using the "arcade_15_25_31" monitor definition.
Unfortunately, simply changing the impedance at the control board between 75/1k ohm doesn't change anything for me.
I understand enough to know that the click is some relay somewhere. And I've read elsewhere that this is possibly some kind of load circuit resetting.
I am happy to test things here but I'm just not sure where to start beyond a visual inspection of the chassis. I can carefully test voltages but I only have a multimeter, not a scope. I have an ESR meter too.
Anyone know what this indicates and how I would go about collecting more information?
Thank you as always