Monitor squiggly lines

ph4ntomlord

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Hello, I am new here so if this question has been posted here already I apologize in advance...

Anyhow, I have an MK4 cabinet and am having a small issue with the monitor. There are squiggly lines that run up and down the screen....the monitor is capped, I've tried adjusting the flyback FOCUS and SCREEN knobs, but nothing seems to take care of the problem. I don't know much about these types of things, and I'm not sure what model monitor I have exactly, so here is a link to a video of some snapshots I took of the monitor chassis.... any insight would be great!! http://www.youtube.com/watch?v=1zBZJlfpMyg
 
So are you thinking a capacitor/capacitors are going bad??
 
So are you thinking a capacitor/capacitors are going bad??

The capacitors do not look the same age to me. Looks like a few select caps were changed but not all of them. The caps that were not replaced may have been good at the time, but now they are failing.
 
How about a video of these squiggly lines?

The chassis looks like it needs rebuilding, but that might not be the cause of your problem...
 
WMS games of that era are known to have video "garbage" on the screen when the switching power supply in the cabinet isn't grounded correctly. You should have a jumper from earth ground to logic ground on the power supply. If that jumper is missing or if the earth ground pin is missing from your cord or has been defeated then you might end up with screen noise.

I'm with Mod, show us a video of the squiggly lines.

FWIW, that crap on the base of the caps in your video is more likely to be glue then it is to be anything leaking from the caps. Your not usually lucky enough to have caps leak on 7400's, they usually just blow the hell up.
 
Are you under the same name on eBay ? If so I just bought your ki board

Yes, that is my name under Ebay....but I have never sold a Killer Instinct board....that's weird. ??
 
Alright, I try and get some video of it posted soon if I can....don't know how well it will show up, as I will be using my phone to capture the footage... (Only piece of recording equipment I own at the moment..:p), but I shall do my best guys!
 
Hmmm - hard to see, but looks like it might indeed be electrical interference. Try running a jumper wire from the power supply ground to the monitor frame, and see if that helps.

Do you have a ground prong on the plug?

Sometimes this happens from having a fridge or oscillating fan or something plugged into the same household circuit...
 
Yes it has a ground prong on the plug....PLUS, I'm a newbie at all this stuff, so I'm not sure how I would go about doing that. Sorry
 
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Get a length of wire - preferably with alligator clips on either end. Attach one to the power supply ground - or just one of the screws holding it down if you can't figure out how to do that - and the other to the monitor frame...
 
Could be a noisy power supply too (noise as in the power supply needs to be replaced or have its caps replaced).

I've seen that on a K7000 before but it was a cap on the monitor chassis.

You might be able to dis connect the game board from the monitor, turn the brightness up slightly just to get a greyish back ground and see if you still have those lines. That would isolate the problem anyway.
 
Get a length of wire - preferably with alligator clips on either end. Attach one to the power supply ground - or just one of the screws holding it down if you can't figure out how to do that - and the other to the monitor frame...
I'll have to give that a try....thanks! :)

Could be a noisy power supply too (noise as in the power supply needs to be replaced or have its caps replaced).

I've seen that on a K7000 before but it was a cap on the monitor chassis.

You might be able to dis connect the game board from the monitor, turn the brightness up slightly just to get a greyish back ground and see if you still have those lines. That would isolate the problem anyway.
Actually, it's funny you mention that, the power supply that is currently in the cabinet IS in fact a used one....the guy I bought it from had to change out a dead one, and put in the used one.....hmmmm interesting.
 
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Well I tried the jumper wire from the ground to the monitor chassis....didn't make any difference unfortunately. :(
 
I thought you told me it was the PCB. You changed the board and the lines went away. Did I misunderstand you?
 
I thought you told me it was the PCB. You changed the board and the lines went away. Did I misunderstand you?

Ummmmm......don't recall saying that....but anyhow, no it's not the PCB. The MK4 board works perfect, and I just swapped it out today with a Y-Unit 4.0 MK1...and squiggles still remain.
 
Here's pics of my power supply if it might help at all....
 
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