Color issue on arcade monitor

ni-ten

ni-ten

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I want more vivid colors on my monitor.
And i do not wanna adjust this on the monitor itself,dont even know if this is possible.
I once had a color booster rgb cable for my super famicom.
It had these little "thingies" soldered in the red green and blue lines.
So now i wanna mod the rgb cable just like that.
What parts do i need?
Any other options?
 
ttooddddyy

ttooddddyy

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ni-ten said:
I want more vivid colors on my monitor.
And i do not wanna adjust this on the monitor itself,dont even know if this is possible.
I once had a color booster rgb cable for my super famicom.
It had these little "thingies" soldered in the red green and blue lines.
So now i wanna mod the rgb cable just like that.
What parts do i need?
Any other options?
Click to expand...

The little thingies would have been pots to vary the individual RGB drives to the video output stages of the monitor.
With RGB drive there is no colour control, you are able to adjust the RGB levels- thats it. Has the monitor suddenly gone "dim" or has it always been that way.
I wonder if the tube may be a bit flat ?
 
ni-ten

ni-ten

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No its almost new it came this way.
Very clear and good picture but too dark.

"you are able to adjust the RGB levels-"
This means i can mix the three colors there?
Dont wanna do that i just want a bit more intense colors.
I just need to know what parts i need for this signal booster mod.
 
ttooddddyy

ttooddddyy

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do you need more brightness ?

as I say there is no colour saturation as such on RGB monitors, a video buffer/amp may be used to increase contrast levels but if the monitor is working correctly this should not be necessary.

The cut-offs and bias pots adjust the amount of R,G or B drive.

Perhaps the monitor screen voltage is low, this will give lack of brightness, there is a pot below the focus on the lfbt. If you are not familiar with the safety issues do not mess with the monitor.
 
ttooddddyy

ttooddddyy

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Perhaps a cap kit. If the video output supply decoupling cap has dried out it may lead to a washed out pic with poor contrast. Usually the brightness would increase though with retrace lines showing up.
If you post a piccy it may give a better idea.
 
ni-ten

ni-ten

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Brightness is 100% okay.
The monitor is almost new.

Just the colors should be a bit more intense.
I could jam up the contrast,but then the picture starts going yellow.
As always when there is too much contrast.

Like i said i had this color booster cable once.
This help the super famicom colors alot.
But I am not sure what exact parts were inside this cable.
 
DaemoN

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Why not just regulate it on the pots on the chassis? Adjusting the R G B lines should solve your problem.
 
ni-ten

ni-ten

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I have a pentranic monitor,but no manual.
So it is possible to adjust color-intensity through pots?
Maybe i could post a foto of the chasis-pcb.
You do not mean the pots(rgb-drives?) on the pcb thats connected to the back
of the tube?
 
DaemoN

DaemoN

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Well...
I have 4 cabs here, all of them got pots on the chassis itself to regulate R, G and B lines...

I would find it very odd if I saw an arcade monitor with no pots to regulate the colors, heh.
 
ttooddddyy

ttooddddyy

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RGB drives, bias pots, cut-offs or whatever video drive adjustments you have on your arcade monitor (on the mother board or CRT base board) will adjust the amount of R G or B, yes it will have an effect on contrast level, but the settings are critical to achieve correct gray scale tracking- they are not able to control colour "intensity". Monitors, at least the ones Ive had experience with, unlike TV sets do not have any adjustments for colour saturation. The outputs from the jamma/mvs board are such that the RGB drives result in the monitor displaying a fixed level of "colour intensity" It sounds to me as if there may be a broblem with the video drive circuitry.
Is the screen voltage set correctly.
As for the booster cable, not familiar with that, is it for consols.
 
ni-ten

ni-ten

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The monitor is 100% ok.
And think of it,i dont wanna mess with that.
But boosting the video signal out from the pcb would be a great option.
 
DaemoN

DaemoN

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No, it wouldn't.

JAMMA boards aren't supposed to be like that.

If the monitor is 100% fine, then you regulate the R G B lines and bang, no more problems.

Boosting RGB sinal on arcade pcbs = stupid idea.
 
ttooddddyy

ttooddddyy

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ni-ten said:
The monitor is 100% ok.
And think of it,i dont wanna mess with that.
But boosting the video signal out from the pcb would be a great option.
Click to expand...

Maybe the tube is flat.
 
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