Cab monitor zooming in an out slightly when playing KOF'96...

Hey, I recieved my KOF'96 from Yaton today and well I chucked it in my mvs 1 slot and well for some reason the screen zooms in and out slightly when things are flashy on the screen, not only that but when the background scrolls it the side opf the screen kind of jumps a little with some dodgy horiztonal line that is kind of white.

I've tinkered with the monitor controls and it hasn't fixed it so I was wondering if anyone has had this problem before and if so what can I do to fix it?

Most games do this. It also happens when words pop up on the screen, it kind of pushes the image "out''. Happens alot on nes games, too.

crujones4life said:

Most games do this. It also happens when words pop up on the screen, it kind of pushes the image "out''. Happens alot on nes games, too.

Click to expand...

Ditto..
...............
I had seen this in many of my Games one comes to mind Metal Slug and was like.

Yep, same here. Nothing to worry about.

Whew...and I thought there was something wrong with my monitor...
But there is one thing, on the right hand side, when you scroll the background,it looks choppy, sort of like it's loading the background line by line...this isn't normal is it?
Would it be the video wiring in the harness or hardware related?or worse..the monitor?

Yep pretty much all general precision CRT monitors/TVs seem to do this in response to varying tonal range. You really pick it up during "flashy" intros, super special moves, large bright explosions etc. I'd be keen to know what the reason is behind it, but it’s certainly nothing to be worried about as it’s a typical scenario.

Maybe Toddy can throw us the low down on this

VGA monitors don’t seem to do it at all or as much, but I'm not sure what it is about them that eliminates/reduces this.

I guess this is why a screen adjust 'crosshatch' pattern is a common inclusion to test menus, as it provides a healthy middle ground in tonal range (no color vs. white) to adjust the screen proportions to, rather than say having a pure white screen or black with a dot in each corner or the like.

Maybe Toddy can throw us the low down on this

Click to expand...

Thanks John, well in a nut shell..........

It depends on how well regulated the monitors (or TVs for that matter) power supply is.

When you see peak white or a suddenly bright image appear the beam current in the CRT has increased, thats to say the electron beams from the cathodes to the anode increase in intensity.

This can cause the +B voltage (typically 130 volts which supplies the horizontal output stage from which some other voltage rails are derived) to drop, resulting in a change in picture size or balooning as its refered to.

VGA monitors seem to have reasonably well regulated psus, maybe a design philosophy thing with PC monitors I dont know, some arcade monitors (and TVs for that matter) Ive seen have poor regulation and baloon badly.

But there is one thing, on the right hand side, when you scroll the background,it looks choppy, sort of like it's loading the back ground line by line...this isn't normal is it?
Would it be the video wiring in the harness or hardware related?or worse..the monitor?

Click to expand...

That could be caused by poor rgb grounding, try running a seperate additional ground wire from the board set to the monitor ground as close to the rgb sockets as is practical.

If the electrolytic caps on your monitor board are drying out the power supply regulation could be effected (there are usually several electros in the psu stage), so if its real bad try a cap kit.

ttooddddyy said:

That could be caused by poor rgb grounding, try running a seperate additional ground wire from the board set to the monitor ground as close to the rgb sockets as is practical.

Click to expand...

How would I do this exactly?

lachlan said:

How would I do this exactly?

Click to expand...

Solder a wire to a ground point on the mobo then connect to the monitor ground.

Use reasonable guage wire and make it short and direct as possible.

There will already be a connection for that in the loom but Ive found that it can be inadequate, less than perfect connection on the plug/sockets on the mobo and monitor pcbs can lead to the problem you describe.

The idea is to have as little resistance as possible between the boardset ground and the monitor ground.

ttooddddyy said:

Solder a wire to a ground point on the mobo then connect to the monitor ground.

Use reasonable guage wire and make it short and direct as possible.

There will already be a connection for that in the loom but Ive found that it can be inadequate, less than perfect connection on the plug/sockets on the mobo and monitor pcbs can lead to the problem you describe.

The idea is to have as little resistance as possible between the boardset ground and the monitor ground.

Click to expand...

Where exactly is the monitor ground and the board ground?
Is this all coming from the loom..or?
I'm not exactly skilled with soldering and i'm not too keen on touching the back of my monitor.

I recieved my MOTW cart today and it seems the cart was to blame for KOF'96 because there are no problems when running MOTW.

Alls well that ends well