Monitor Help (again...)*Problem Solved*

[Oni2382]

I swapped this monitor off of an old Golden Tee cab...I have no clue what kind of chassis it is or what kind of tube. It was working perfectly before I stuck it into my other cab now all i get is a green screen with lines across it.

Like so.......

the series of letters and numbers on the tube...read as follows....  b63afw36x

if anyone could help I would REALLY appreciate it... Thanks

[Kevin Mullins]

Looks like there is no video input......

And those tubes numbers you gave are useless. You need to look at the chassis itself.
http://forum.arcadecontrols.com/index.php?topic=62016.0

[qrz]

well, its a 25" crt   

and bright w/retrace.

u may have bumped the screen ctl ( bottom pot on fly)
or, there is a problem with the green output xistor - pic looks green

73 de j

[Oni2382]

OK here are pics of the Chassis...I have checked the solder joints and they all look good, as well as the condition of the wires. Any ideas as to what kind of chassis this is?

[Kevin Mullins]

Model CGM-2500 found in a couple places.

[Oni2382]

qrz...

When you say I may have bumped the screen ctl on the bottom of the fly, are you referring to the flyback transformer?

[SirPeale]

qrz...

When you say I may have bumped the screen ctl on the bottom of the fly, are you referring to the flyback transformer?

Yes, he is.

[Oni2382]

OK and If I am not getting any video input like Ken said, how can I troubleshoot that? (I have checked the connections and solder joints....

[Kevin Mullins]

OK and If I am not getting any video input like Ken said, how can I troubleshoot that? (I have checked the connections and solder joints....

You mentioned something about a Golden Tee...... but what is this monitor actually in now and how do you have the video cable connected ?

[Prodarkangel]

thats pretty muych the same problem i am having with my 33" sharpimage. I have mine connected to with a jamma PCB to a VGA breakout cable

[Oni2382]

OK and If I am not getting any video input like Ken said, how can I troubleshoot that? (I have checked the connections and solder joints....

You mentioned something about a Golden Tee...... but what is this monitor actually in now and how do you have the video cable connected ?

It's in a Konami 4 player cab...I took the monitor with the entire power supply from the GT cab and placed it in the Konami cab..took the harness and everything, and heres some pics to show how I have it hooked up...Honestly I must have bumped something I have no clue what the hell is going on...But then again thats why I turned to you guys   

[Kevin Mullins]

Are you running just a standard JAMMA board in that cabinet?
Or is it some MAME setup?
Are there three wires in the small connector I circled?

Try moving it down to the end pin.

The schematics don't give a simple pinout, but it looks to have both composite sync and seperate sync capabilities.
http://www.freeinfosociety.com/electronics/schemview.php?id=2195

Seems like we just looked at one of these not long ago here on the forum.

[ken_cinder]

Looks like the ground wire is on that connector too, not a simple "move the connector" in that case.

[Oni2382]

To answer your question I'm using it for JAMMA.....on the board it has markings..keep in mind I had just moved that connector over before I took the pic..It wasn't hooked up like that the entire time. Also in the second photo what is that pot knob for?

[ken_cinder]

Like I said........the video ground wire is in that connector. If you moved it, you now most likely have no ground.

[Kevin Mullins]

Typically the black wire would be the video ground.

Question is.... are the gray and white wires tied together somewhere towards the JAMMA harness?

Here's the thread I was thinking of:
http://forum.arcadecontrols.com/index.php?topic=89750.0

You'll notice the harness only has five wires instead of six like this one does. Two of those should be tied together for composite sync. (gray and white I'm presuming)

The very end pin would be the sync, the third pin in would be the ground.
So to start with I would just move that connector all the way to the end and let us know what you get then. (leave the red/green/blue connector alone)

[ken_cinder]

Typically the black wire would be the video ground.

Question is.... are the gray and white wires tied together somewhere towards the JAMMA harness?

Here's the thread I was thinking of:
http://forum.arcadecontrols.com/index.php?topic=89750.0

You'll notice the harness only has five wires instead of six like this one does. Two of those should be tied together for composite sync. (gray and white I'm presuming)

The very end pin would be the sync, the third pin in would be the ground.
So to start with I would just move that connector all the way to the end and let us know what you get then. (leave the red/green/blue connector alone)

Yep and if that's true, he has nothing on either sync and video ground on Vertical sync.

Some monitors don't like Jamma's composite sync on both H+V too though, in which case it will need to be on H only. I've never personally seen a case where one will sync on Vertical only.

[Kevin Mullins]

Yep and if that's true, he has nothing on either sync and video ground on Vertical sync.

Some monitors don't like Jamma's composite sync on both H+V too though, in which case it will need to be on H only. I've never personally seen a case where one will sync on Vertical only.

Agreed..... which is why I just want him to move the whole thing over and then we can go from there.

I've seen some monitor/game pcb combinations that wanted a jumper between the two sync pins. But it's all dependent on what we see once some sort of sync and ground are proper.

And let us know where the gray and white wire lead to and how they are connected.

[Oni2382]

OK so i moved the cable over and although I still get a green screen I can now see the game playing faintly. I adjusted the brightness on the flyback and that didnt fix it nor did adjusting the contrast help.

[Kevin Mullins]

Let us know where the gray and white wire lead to and how they are connected to the JAMMA harness.
Looks like it's syncing fine now though, but just so we know ahead of time.

I would start by turning the contrast and brightness about halfway, Adjust the SCREEN on the flyback until there are no horizontal lines and any black areas of the screen actually look black.

Have you adjusted anything on the neck board that plugs into the tube?

Take a look at the neck board controls and see if any of those are cranked up.
These control the RED, GREEN, BLUE guns.

[Oni2382]

tried adjusting the knobs on the neck board, and on the control board and nothing got rid of the green...all it did was adjust the picture of the game in the background..when I adjusted the brightness on the flyback the screen went completely black, so I turned it back to get it to the green screen.....

As far as the gray and white wire the were spliced from the sync on the jamma harness...

[Oni2382]

OK I found the issue.....I discharged the monitor to get a good look at the chassis once again. Before I put the chassis back in place out of mere happenstance I looked at the tube and noticed one of the pins was SEVERLY bent. I carefully straightened the pin back, and once everything was hooked up I fired her up and everything is all gravy....Thanks for everyone who replied and helped me trouble shoot.   

[Kevin Mullins]

Ain't it funny how things like that happen ?
Definitely not the first place I'd look.

Glad you found that though...... otherwise we could have been running in circles for a while.
 

[Oni2382]

O yea I let out a BIG sigh of relief when I found that, I was running out of things to look for and i was getting really frustrated. But it worked out now I can start fixing up the cab...which is another post 

[SirPeale]

Your contrast is up a bit high, see the blue bleed? 

Good show on finding the bent pin.