need some help with my monitor signal, please..............

[higgo60]

hi everyone, i hoping somebody can give help with arcade monitor. i have just recently had to changed the hard drive and installed windows xp
so i have just set everything up so i get a signal to the monitor and when windows boots up im getting a picture with the left side of the proper image on the right side of the screen and vice versa with a thick black bar going vertically going down the middle of the screen and im wondering what i need to do to fix it, thanks for the advice in advance.........

[Kevin Mullins]

What make/model monitor?
What resolution are you trying to run?
Have you tried any horizontal hold or shift adjustments on the monitor itself?

[higgo60]

Hi, the 27" samsung from a sega fighting vipers cabinet which it is still in bu I can't see what model number it is. From one of the members on this forum I have been told I need 31hz and I have tried horizontal hold etc and not getting much movement. Any suggestions???

[Malenko]

what video card? is the picture normal when you hook it up to a regualr PC monitor? What resolution are you running, what drivers are installed?

[higgo60]

originally i had been using ultimarc's avgcard which after installing the drivers and rebooted it would revert back to windows drivers and not show the avgcard in device manager. so i tried it with the on board graphics instead. i have been told to use 640x480 resolution, and yes when i revert back to onboard graphics it can be seen as normal screen on a pc monitor no problems. should i be using soft 15hz software. sorry for all the questions 

[southmonitor]

It looks like if you have a problem with the Sync Signal Polarity. Check if the Monitor have any switch to reverse the sync polarity from positive to negative or viceversa. Sometimes there are little pins where you can switch that. DO NOT CHANGE ANY SWITCH YOU DON'T KNOW WHAT IS FOR. Just try to find that one and give it a try.

[higgo60]

hi again if i take a picture of the screen when it is on to show you what you mean.....

[southmonitor]

I know what you mean; but a picture can help. Better take a video with your cell if you can. Anyway what you are describing is consistent with wrong sync polarity. The monitor will sync with the wrong edge of the sync pulse and that's why you are getting the displacement of the image on the screen. The dark band in the middle is actually the erase time in the raster that should be on the edges and not the center. adjusting H- Position and H-Hold could help moving the image sideways; but if the polarity is wrong you will never be able to get it right. Another solution is trying to change the sync polarity in the game software which sometimes is possible through dip switches in the game main Board. Actually I don't know what game you have.

[higgo60]

hello again, here is a picture anyway so you can see what im seeing. please ignore the wavy lines but the black bar in the middle is what i was talking about...cheers

[SirPeale]

Looks like you're not feeding the monitor the right signal.

[higgo60]

ok, well does anybody how i can get around this problem in laymans terms please........

[MonMotha]

If your monitor has a "Horizontal Hold" or "H Hold" or maybe "H Freq" control, try adjusting that a little.  It shouldn't take much to get it to lock properly if you are indeed feeding it both H and V sync.

I'm not sure if you have the proper video mode set up or not.  For a standard res arcade monitor, you need 640x480i - that's interlaced video.  This will be at 15kHz horizontal scanrate.  Windows won't offer to do this without much persuasion (driver hackery or 3rd party programs) since almost no actual PC monitors can display these timings.  The standard 640x480 setting is progressive which gives 30kHz scanrate.  This will generally result in a "doubled image" when displayed on a 15kHz CGA arcade monitor.  However, the effect you're seeing doesn't appear to be this.  The two "doubled images" you normally get for VGA on a CGA monitor are almost identical - what you would see is two lines of video per displayed line on the monitor.  What you appear to be getting here is both halves of the display but with horizontal sync offset in time to the middle of the monitor which is weird.  Like southmonitor said, you may need to adjust sync polarity (or perhaps just hook up horizontal sync if it's not hooked up properly).

Do you have any programs installed to alter the video settings (e.g. Soft15kHz)?

Does the black bar move any, or is it always right in the middle?

IDing the monitor may help.  If this is a VGA monitor, then you don't need to do anything wierd, and this is probably just a wiring or settings issue.

[grantspain]

its a nanao ms9-29 or ms8-29,looks like a setup issue with the graphics card to me
unless of course this monitor has been manually configured to 24khz via the frequency jumper

[southmonitor]

Obiously this is an H-sync problem. The image is shifted Horizontally, I still think you have an H-sync polarity problem.
1-Can you move the image sideways by adjusting the H-Position Control? I need to know this first.
2-Check if the Monitor is properly grounded, so does the computer. That is, the Monitor and Computer ground are hooked up together somehow. If the Monitor is not grounded there is no direct return path for the sync signal and evenwhen you might be able to get image it will try to recover the sync from the video signal and not from the dedicated sync lines. In other words it can't sync. Sometimes the Video cable does not have the ground wire. The problem is that the video you will be getting will be a little different that the one in the pic; but try the grounds first anyways.
3- I'd like to see a detailed picture of the Chassis to try to find some switches for setting the proper sync polarity. Post it here if you can please.
4- Take a picture of the input video connector and surrounding area. I want to see how are you feeding the Video to the Monitor. Maybe you are using the wrong pins to feed the sync siganl. If you have composite sync video signal (H+V in the same wire) you have to feed it to the monitor through the dedicated pin because the Monitor needs to separate H from V sync before sending them to the H and V sync circuits.
5- After all this, we might need to invert the Hsync polarity using a very simple circuit to see if it solves the problem or not.

[higgo60]

hi again guys, just to let know i got in ciontact with andy at ultimarc regarding my problem why my avga card wasnt working properly and he told that was a newer version of original drivers that come on the disc with the card which he sent me a link to and i downloaded and installed and i can now say that problem has resolved. i just like thank you all for your help and advice especially grantspan... much appreciated.....