Help with Monitor Discoloration

[SegaAges]

I looked in the manual and it said something about a circuit breaker since the marquee is not getting power, but I have no clue where that is located.

EDIT: I found the wire that was not plugged in properly. I got the marquee light going.
Now, I just get a small dot on the screen instead of the picture

EDIT: I was looking at the manual for a k7000 to check it out, and saw some awesome looking controls for horizontal and vertical stuff, so I went to check on mine. While it did not have them, I noticed a capacitor that looked like it had literally busted open. I am pretty confident that I found my issue and I need a cap kit.

Before I order the cap kit, is there anything else that I should try?

And, just to make sure I order the correct one, I might need some help getting the exact model number of my board.

I guess the tricky part will be completely removing the board, since I had issues getting it removed the first time. Are there any wires besides shit connected to the neck board that would stay connected to anything that is not on the board?

I do know that there is 1 wire, which I will have to take a picture of tomorrow that looks like some sort of ground that is connected near the front of the screen

[Peale]

If you found a burst capacitor it definitely needs to be replaced.

Other things that can cause what you're describing: unplugged yoke. Check it.

[SegaAges]

I feel like a noob asking this, but is the yoke the item that the neck board plugs into?

[TheDomesticInstitution]

Big Diagram Here

[SegaAges]

hmm, how would I check if the yoke itself is unplugged?

I have triple checked that the neck board is plugged in.

[TheDomesticInstitution]

That one is beyond me. Messing with yokes and tube stuff is definitely for the experienced. I don't know why it would be unplugged though... fuck I didn't even know you could unplug it. If a monitor were this much trouble, especially with my skills, I'd be on the hunt for a new one. Or at least try and find someone local, who's into the hobby, to help me.

What exactly is it doing? Did you do a complete cap kit? Do you have any neck glow? Neck glow is hard to see sometimes with the light on. Maybe you have a bad flyback... I recently had to replace one.

[SegaAges]

That one is beyond me. Messing with yokes and tube stuff is definitely for the experienced. I don't know why it would be unplugged though... fuck I didn't even know you could unplug it. If a monitor were this much trouble, especially with my skills, I'd be on the hunt for a new one. Or at least try and find someone local, who's into the hobby, to help me.

What exactly is it doing? Did you do a complete cap kit? Do you have any neck glow? Neck glow is hard to see sometimes with the light on. Maybe you have a bad flyback... I recently had to replace one.

The picture is coming in as a very small circle in the middle of the screen. When I say small, I mean about an inch or 2 in diameter.

Honestly, if it is not the yoke, I want to keep going until I have no other alternatives so that I can learn the stuff. I will never learn until it is broken like it is

[Arcade Antics]

Honestly, if it is not the yoke, I want to keep going until I have no other alternatives so that I can learn the stuff. I will never learn until it is broken like it is

You've gotten a lot of responses here from knowledgeable folks who are trying their hardest to help you.

You mentioned finding a cap that exploded, and you were asked whether or not you installed new caps on the monitor. You didn't answer, so it begs to be asked again. Did you do a cap kit on the monitor? It's not going to work properly no matter what else you mess with if the caps are shot.

[jb143]

The picture is coming in as a very small circle in the middle of the screen. When I say small, I mean about an inch or 2 in diameter.

Honestly, if it is not the yoke, I want to keep going until I have no other alternatives so that I can learn the stuff. I will never learn until it is broken like it is

You can make out the picture though? It sounds like a bad cap(s) to me. Electrolytic dry up over time and as they do their value changes. Capacitors are used for things like setting frequencies...like telling the beam when to sweep back and forth. If the value changes, the size of the picture can change because of it.

Also, just so you know, leaving it running like that for too long can burn that circle into the screen.

[Peale]

hmm, how would I check if the yoke itself is unplugged?

I have triple checked that the neck board is plugged in.

Examine the yoke itself. It's a series of copper windings on a plastic frame.

Usually on the top of the yoke are four connectors with wire leading from them. The /usual/ colors for these wires are red, green, blue and yellow.

Follow the wires down to a connector. This connector will either be plugged into the main chassis, or it will not be. If it's not, then we'll plug it in. If it is...well, we'll burn that bridge when we get to it.

Also: yeah, you still need to replace that cap if you have not.

[Peale]

I'd forgotten you have a K7000. I had to go back and check out your album.

You can see a picture of the yoke connector in this picture:



It's pretty much in the middle. It's right in back of the flyback area. It's a pain to put back into place. If you've had the chassis out, it's really easy to think you've put the yoke back when you've just put the connector between one of the big caps back there and the heat sink.

[SegaAges]

Arcade Antics: Oh yeah. I assure you, all the help you guys are giving me is just amazing and I can't even begin to express how fortunate and thankful I am for you guys helping me.

I ordered my cap kit last week, and was just seeing if there was anything else I could check while I was waiting for the cap kit.

I can check to yoke and that stuff, and then once my cap kit arrives, I will work on that.

Actually on that picture that Peale shows, you can see the capacitor that I was talking about. If you look at it, it is clearly bursted open and leaking onto the board.

[Arcade Antics]

I ordered my cap kit last week, and was just seeing if there was anything else I could check while I was waiting for the cap kit.

I can check to yoke and that stuff, and then once my cap kit arrives, I will work on that.

Actually on that picture that Peale shows, you can see the capacitor that I was talking about. If you look at it, it is clearly bursted open and leaking onto the board.

You'll have to pull the chassis to do the cap kit, so no reason to check the yoke connection until you've put it back together after installing the new caps.

[SegaAges]

You'll have to pull the chassis to do the cap kit, so no reason to check the yoke connection until you've put it back together after installing the new caps.

Do I have to pull the entire chassis out, or can this be done by just pulling the monitor board and neck board?

I ask because the chassis is glued into the cab, and it will be a serious pain to take the entire thing out.

[TheDomesticInstitution]

Do I have to pull the entire chassis out, or can this be done by just pulling the monitor board and neck board?

I ask because the chassis is glued into the cab, and it will be a serious pain to take the entire thing out.

When I do a cap kit, I pull the monitor PCB and the neck board. People often refer to these 2 boards as the chassis.

[SegaAges]

Ah, I understand now. Sorry, I am still learning. He said chassis and I was under the impression that I would pull the entire monitor out. That would suck for me pretty bad since the monitor is glued in.

[SegaAges]

Here are the pictures of the wire that I was telling you guys about. It goes from somewhere on the board to the front of the monitor. What is this wire used for?



Here I put an arrow pointing to it

[SegaAges]

Yeah, I am guessing that wire is a ground. I am just unsure it is it required since I have not seen it in other pictures of monitors

[vandy160890]

I would like to ask you that how much old is your monitor?
The discoloration may be because of the old worn out parts & you probably need to buy a new one. You can surely get it checked from the expert.

[Peale]

I would like to ask you that how much old is your monitor?
The discoloration may be because of the old worn out parts & you probably need to buy a new one. You can surely get it checked from the expert.

He's got a K7000 which is well documented, and a generally easy monitor to repair. He doesn't need to get a new one, he just needs to fix the one he has.

SegaAges, the wire you're talking about, if I'm looking at the right one, goes to the neck board. It may have been clipped (and you can splice the ends back together with a wire nut or something) or it may have been unsoldered from the neck board. It does need to go back. Though the monitor will work without it, it will build up a charge that will periodically SNAP when it reaches a certain potential. Eventually it may cause damage.

[Peale]

Actually on that picture that Peale shows, you can see the capacitor that I was talking about. If you look at it, it is clearly bursted open and leaking onto the board.

If it's brown stuff around the bottom, it's actually probably glue. Either way, you'll be replacing it.

[SegaAges]

Right now I have some of those things I used for my speakers where you put the wire in there and then twist the 2 sides of the wire in there.

Would it be bad to use that?

[Peale]

You mean a wire nut? That'll work fine.

[SegaAges]

Sorry dude, I am horrible with the names of stuff.

I am going to, hopefully, start working on the cap kit sometime this weekend.

Once I get it done, I am going to post and say how it went.

[SegaAges]

Just an update, I finally got the cap kit installed. I am going to piece everything back together tomorrow sometime and see what happens.

EDIT: video board is in, but now no power. I am going to double check to see if something I plugged in is flipped.

EDIT2: I checked and everything is plugged in. I even triple checked the issue I ran into before with this not getting power.

I will be honest, I am at a total loss as to what is happening. It is like everytime I touch it, it gets worse. I know there is a way to fix this, but I have no clue what I should be checking next.