WG M2574 Flashing/Fading after 4 minutes

BJPalmer

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Help!
I bought an AvP Capcom cab with an old WG monitor that desperately needs a cap kit a while back.
Haven't got around to doing that yet, but just bought a Ranger Mission with a WG that was manufactured in '05, so looked great.
Long story short, I decided to put that '05 in the AvP cab.
Now, after about 4 minutes, the picture starts to wobble a little, like somebody's messing with the remote board. I checked to make sure nothing was contacting the remote board, and all connections are solid.
After about 20 seconds of this wobbling, it fades to a grayish white.
Oh, also: I took the power supply and isolation transformer out of the Ranger Mission cab and plugged those into the AvP cab to see if it was a problem with either of those components in the AvP cab. It was not, the behavior didn't change.
It comes on fine every time, but does the flashing/wobbling/fading thing every time, too.
Any help/ideas would be GREATLY appreciated. The gods apparently just don't want my AvP cab to have a working monitor! :)
 

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Check the neckboard connection to the tube. Make sure it didn't loosen a little during the move or that none of the pins are bent. And double check all the connectors on and to the monitor are seated fully...
 
OK, checked all connections.
Harness from mainboard was loose, plugged in tight. Realized ENTIRE neckboard was pulled back from the tube a little, so pushed that back onto tube end.
Now it will not power up at all.
:(

edit: I checked the fuse, and it's good. I have a multimeter if there's any test points I can try...
 
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Pull the neckboard completely off and make sure there are no bent pins on the tube.

Take a close look over the neckboard for bad solder joints while you're at it.
 
Hey, first of all let me say thank you guys for the help.

I pulled the neckboard completely off, and all the pins are straight as an arrow.
Inspected the solder on the back of it, and could not find anything out of the ordinary.

Here are some pics, in case you see anything non-kosher.
Also, if it would help to have more specific photos, let me know.
 

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Thanks for checking the tube pins, went round and round helping someone troubleshoot a similar issue just to accidentally find where someone had removed the neckboard and bent a pin putting it back on once. (pulled the neckboard for something else and found it)

Riddled your picture with arrows.....
Check the grounding strap going from the neckboard to the back of the tube.
You may try to remove and re-secure the white focus wire going into the neck socket.
Check around the SCREEN and FOCUS pots on the flyback for any signs of cracking.

And where's your power ground wire ? ;)
 

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It would also be a good idea to get the proper Molex connector for those power wires...
 
Riddled your picture with arrows.....
Check the grounding strap going from the neckboard to the back of the tube.
You may try to remove and re-secure the white focus wire going into the neck socket.
Check around the SCREEN and FOCUS pots on the flyback for any signs of cracking.

And where's your power ground wire ? ;)

OK, as far as the grounding strap from neckboard to back of tube, it's a black wire and seems to be making a good connection. Question, though: is there a specific point of entry INTO the tube that the ground wire should be making, or is it just basically a net around the backside of the tube?
The white wire that goes from the flyback to the neckboard, is that what you're talking about? It is secured pretty tightly to the neckboard, don't want to break something trying to remove it. Let me know if there's a safe way to remove that and reseat it.
NO sign of any cracks/damage to the flyback around the FOCUS and SCREEN knobs.

The power ground in the cab was attached to the metal chassis. When I took the power supply / isolation transformer out of the other cab to test it, those are the connectors that were originally connected to this monitor. There WAS no ground wire for it. The operator had just terminated the Hot and Neutral wires with the metal slip ons that go inside the Molex connector. :(
Any chance that not being grounded could have damaged the boards? <crosses fingers>
 

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Question, though: is there a specific point of entry INTO the tube that the ground wire should be making, or is it just basically a net around the backside of the tube?

Nah, that's pretty much it, goes to the metal braid around the backside of the tube. (no "entry" into the tube)

The white wire that goes from the flyback to the neckboard, is that what you're talking about?

Yeah, that's the one. That's the FOCUS lead.
Working from the bottom arrow up in this pic....gently pry the little tab on the side, the cover will then be able to flip up, pull the wire out.
(pop the wire out of the little plastic hook thingy first)

Just wanna make sure the bare wire end isn't broken, corroded, etc.
Most likely fine, but easier to check these little things and then just move on.
 

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Nah, that's pretty much it, goes to the metal braid around the backside of the tube. (no "entry" into the tube)



Yeah, that's the one. That's the FOCUS lead.
Working from the bottom arrow up in this pic....gently pry the little tab on the side, the cover will then be able to flip up, pull the wire out.
(pop the wire out of the little plastic hook thingy first)

Just wanna make sure the bare wire end isn't broken, corroded, etc.
Most likely fine, but easier to check these little things and then just move on.

Wow, I'm learning all kinds of cool stuff.
Checked the Focus wire, and it is pristine.
...

Also, got a proper MOLEX connector for the ac in, and hooked it back up...now what the hell is this!?
 

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Make sure you have voltage to the monitor. You may be chasing ghosts. If you have no power to the monitor, it won't come on...
 
Looks like the monitor is on..... no idea what that thing in the upper left corner is though.

Does your GAME still play ?
("blind" - no picture on screen but coins up and can hear it playing)

Video cable still connected from the game pcb and all that ?
 
OK, now I'm wondering if I know ANYTHING at all...
Considering your question, I had not actually heard the game boot up. So I went and got the ENTIRE JAMMA harness out of the cab that the monitor came out of, an Atomiswave motherboard with Ranger Mission, and the power supply/iso transformer and hooked them up to the monitor. It worked. Great news!!!
OK, why isn't it working with the AvP board and JAMMA harness? Well, the Red, Green, and blue wires are where they're supposed to be, BUT: the other two wires (ground and sync?) were in different locations.

So...now I just have to figure out where those need to go. The pin listed as "Ground" on the chassis of the monitor did have the ground wire attached to it in the old cab, so I copied that with the wires from the new cab's Jamma harness.
Which leaves ONE wire which I have NO IDEA where to connect.

Apparently, after some searching around the interwebz, there are Horiz Sync + and -, and Vert Sync + and -. Since there's only one wire, where does it go???
I should note that on the previous cab, the last wire was looped around and was contacting the last two pins on the chassis.
(Also...THANK you so much everybody for all your help so far.)
 
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I thought you just had this game running....or maybe now I'm confused as well.....

Either way....

Apparently, after some searching around the interwebz, there are Horiz Sync + and -, and Vert Sync + and -. Since there's only one wire, where does it go???
I should note that on the previous cab, the last wire was looped around and was contacting the last two pins on the chassis.
(Also...THANK you so much everybody for all your help so far.)

JAMMA games - Horiz Negative Sync - Last pin (opposite end from the red wire)

Some monitors are a bit finicky and just won't quite lock the sync even with adjustments, which is where the "loop" wire comes in. Try just the one pin first.
 
I thought you just had this game running....or maybe now I'm confused as well.....

IT WAS!!! Working fine until the initial wobbliness/fading started.
Now, I'm pretty sure it's NOT the monitor, as Ranger Mission in the Atomiswave mobo works.

OK, well, the first pic is what I get with the pins connected as follows:

9-> sync
8-> empty
7-> empty (I was under the impression this is also a ground, put it here for second pic)
Blank space
6-> empty
5-> empty
4-> ground
3-> blue
2-> green
1-> red

Then, though I didn't think it would make a difference, I moved the ground wire to position 7, and that's what the second pic is.
What gives?

EDIT: HOLY CRAP, my AvP board suicided. The monitor WAS loose at the neckboard, and the damn CPS2 battery chose RIGHT then to die. Frick!!!

Thanks so much for everything guys, you did actually help me fix the monitor....I just didn't KNOW IT!!!!

2nd EDIT: NO WAIT....damn screen is back to doing what it initially was. Wobbling, starts to bleed colors, then fades to white. WHAT THE HELL!? Man, this is starting to be a black hole of an arcade cabinet.
 

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So right now if you leave the monitor alone......the AVP board does NOT come up, but the Ranger Mission board DOES ? (aside from the turns white fades out issue)
 
Sounds like the problem is with the board, not the monitor....

I do believe the AvP CPS2 battery suicided WHILE I was working on the monitor.
However, the original problem still exists on the monitor, no matter what board. It starts to wobble, then bleeds the colors, then fades to white.
 
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