WGk7600.. two monitors display same thing.. cab issue?

cueball

Active member

Donor 2011
Joined
Mar 4, 2007
Messages
3,313
Reaction score
24
Location
Coatesville, Pennsylvania
WGk7600.. two monitors display same thing.. cab issue?

I was checking on a Wg76xx for a 60-1 multigame.. tube is good but there was intereference on the screen.. so i was going to do a chassis swap with another know working WG76xx that i have. but when i connected that to the cabinet, i got the same interference.

I didnt do the wiring (cab came with it), but the interference are some diagonal lines and dots between them. it happens on both monitors so i am fairly certain it is a cabinet issue. where should i begin.

oh, and i know that pics are worth a thousand words, but i am done for tonight and i dont feel like carting the monitors to where the cabinet is.
 
Do you have a ground prong on the plug? Have you tried plugging the game into a different outlet? Sounds like electrical interference somewhere - either from something else in the room (like a ceiling fan, neon sign, refrigerator, etc) or perhaps something in the cab (marquee light ballast, coin door, bad or missing ground to the monitor frame)....
 
i do have a ground plug on the cord and i thought a good ground to the monitor, but i will check that out tomorrow. i fell off of a ladder today (at about 5'high) and landed on my side. I am too sore right now to do any more work on it.
 
i do have a ground plug on the cord and i thought a good ground to the monitor, but i will check that out tomorrow. i fell off of a ladder today (at about 5'high) and landed on my side. I am too sore right now to do any more work on it.


Those damn Xmas lights... Hope your Ok.
 
I was checking on a Wg76xx for a 60-1 multigame.. tube is good but there was intereference on the screen.. so i was going to do a chassis swap with another know working WG76xx that i have. but when i connected that to the cabinet, i got the same interference.

So same interference on two different monitors, two different cabinets ..... sounds like a board issue.

Try it in another JAMMA setup with a different model monitor if you can.

EDIT: Just reinterpreted your initial post, I see that you tried the second monitor in the same cab.
 
Last edited:
Check the video ground wire. I had the same problem with a WG7000 series monitor - the video ground wire was broken right at the connector. The picture came up, but with tons of weird interference in it. Resoldrered the wire, and it was fine.

-Ian
 
If you're trying this with a K76xx monitor and a 60-in-1, make sure your monitor is not the med-res version. If it is, then that "interference" you see may actually be a double-image being spread out and flickering....
 
okay, i spent more time out there tonight. introduced a 13" monitor into the picture...same thing.. even tried a different board (double dragon vs the Main Event). i have attached a couple of pictures below.

i checked all of the connections, tightened all of the grounds (they were already tight). traced the wiring from the board to the monitor. (have red blue green and ground then -H &-V split from the one wire). i even changed the power switch.

the pics were hard to capture but it kinda goes left to right and has the look of dashes or dots. the only thing i havent done was change the filter or the power supply.. hmm.. i am going to change out the power supply and see what happens.


 
i checked all of the connections, tightened all of the grounds (they were already tight). traced the wiring from the board to the monitor. (have red blue green and ground then -H &-V split from the one wire). i even changed the power switch.

You traced them, but did you actually check it with a meter? I still think it looks like a video wiring issue. Clearly, since the picture is stable on the screen, the syncs are good - but check the video ground, check to ensure that the red, green and blue signals are actually going to the proper pins on the monitor connector, and that none of them are shorted to ground.

Unplug the game board, unplug the monitor video connector, and actually ohm out all the video wires.

-Ian
 
You will get the exact same "symptom" if you have the dip switch on the 60-1 set for VGA instead of CGA
 
Unplug the game board, unplug the monitor video connector, and actually ohm out all the video wires.

-Ian

i will check on them..


Deadly.. i am not even using the 60-in-1 yet.. i am using existing known boards so that i dont introduce another variable into the situation.
 
Now that I re-read sorry I misunderstood I thought the 60-1 was hooked up. And enlarging the pics instead of quick glancing at the pictures helps as well ;)

Can I assume you have a switching power supply in there? Checked the voltage? Have a spare to hook up real quick?
 
Last edited:
I do have a switcher and i did put in another (which worked the a few weeks ago when i tested with the boards on another cabinet). putting the other switcher in did help a little.

I also read the Ohms on the video cables.. from connector to connector.. the red/green/blue and sync all registered about .7/.8 MOhms, the ground measured .3/.4 MOhms.

how can I shore up the video ground on this?
 
If you have a standard PC power chord chop it and wire it into the switcher and run an extra ground from the swicthers ground to the monitors frame.
 
I don't know if this has been asked yet, but are you getting good power through an isolation transformer?
 
I don't know if this has been asked yet, but are you getting good power through an isolation transformer?

that has not been asked, however, it was my thought. I will disconnect the monitor and check power at the molex. Since there was 'interference' i thought that it may be the ac filter, but its either that or the ISO (i think)
 
Back
Top Bottom