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Author Topic: WG 25 K7000 - could it explode?  (Read 2902 times)

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b3dr0ck

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WG 25 K7000 - could it explode?
« on: March 08, 2011, 04:57:30 pm »
I've got 4 WG25K7000s, and I'm trying to test them out, and get them up and running. 

One is working fine.
One has a blown Flyback, and a shorted HOT on the chassis

So, I've got two on the floor that I am messing with, and my technical skill level is novice (you may have seen my other posts).

Today I plugged power up to one monitor I've not tested yet.  It's getting 129vac at the plug (Midway MKII cab).  I plug it in, turn it on - I see a white flicker in the yoke and a hear a very high pitch sound that sounded like it was escalating in volume.  It was fairly loud, I was standing 3' from the monitor and it scared me.  I turned it off, and tried two more times.  Pretty much the same thing.

My gut feeling was, it was going to explode.

Any insight?

grantspain

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Re: WG 25 K7000 - could it explode?
« Reply #1 on: March 08, 2011, 05:13:32 pm »
you said the white flicker is coming from the yoke?

b3dr0ck

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Re: WG 25 K7000 - could it explode?
« Reply #2 on: March 08, 2011, 05:18:12 pm »
Yes.  I thought to myself - that doesn't look right.  (I don't know what I should look like, really)  I was like electricity jumping.  It looked to be contained inside the yoke, right where the silicon glue had it attached.

I reattached the neck card at some point.

grantspain

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Re: WG 25 K7000 - could it explode?
« Reply #3 on: March 08, 2011, 05:22:24 pm »
i reckon your tube is down to air-meaning physically cracked

tried more than one chassis with the same result?

b3dr0ck

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Re: WG 25 K7000 - could it explode?
« Reply #4 on: March 08, 2011, 05:31:58 pm »
I do recall seeing a small piece of glass about the size of a dime on the chassis when I started putting the neck board back on and straightening out the pins. 

4 Questions:

 - So a cracked tube = trashed tube? 
 - That sound is air, or something leaking out?
 - The neck board is physically attached to the chassis with two wires.  To try another chassis, I should cut those wires and splice when I attach another chassis?
 - So from what we've briefly seen so far, K7000 chassis seems fine - do we know enough at this point, I'm just thinking I can switch it out with the one with the blown flyback.

grantspain

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Re: WG 25 K7000 - could it explode?
« Reply #5 on: March 08, 2011, 05:44:19 pm »
if the tube is cracked then its for the bin
that noise is electricity arcing,surprised you did not see a nice light show in the neck

do your other chassis not have neck cards,there should be more than two wires-the two wires you describe from the flyback i expect

b3dr0ck

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Re: WG 25 K7000 - could it explode?
« Reply #6 on: March 08, 2011, 05:57:34 pm »
Yes and Yes.  It was a light a show. 

There are other wires on the neckboard, but they can be unplugged.  Those two wires are from the flyback, if I recall. 

So, if I'm replacing the chassis, the best thing to do is to unplug those all the wires with connectors on the neckboard, and cut the 2 from the Flyback, and splice them?  (Unsolder them from the neckboard?)

Just toss the the tube?  The neckboard is OK?

grantspain

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Re: WG 25 K7000 - could it explode?
« Reply #7 on: March 08, 2011, 06:08:19 pm »
hmm you could just join the wires to test but you really need to solder these correctly as they are high voltages

that tube needs to be disposed of

neck card probably ok

doing some scary stuff for a novice mate

b3dr0ck

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Re: WG 25 K7000 - could it explode?
« Reply #8 on: March 08, 2011, 06:20:32 pm »
It is scary, but I do not want to remain a novice.  I am fast tracking to the next level above novice, while avoiding the other advancement - electrocuted.

Thanks for the help.  I'll toss the tube, and salvage the parts.  I'll most likely take this chassis and connect it to my other tube.

Kevin Mullins

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Re: WG 25 K7000 - could it explode?
« Reply #9 on: March 08, 2011, 06:57:35 pm »
Yeah, that tube sounds like it's trashed.
You could fire it up with the house lights off and then you'll really see what's going on.

Maybe I misunderstood somewhere.....but why are you wanting to separate the neckboard from the main chassis ? (talking about cutting flyback wires and such) Just keep them together as a unit. When you "swap a chassis", just swap both parts together.

You have one monitor with a bad flyback.....one with a busted tube.
Swap the whole chassis from the busted tube over to the mointor with a bad flyback.
 
Not a technician . . . . just a DIY'er.

b3dr0ck

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Re: WG 25 K7000 - could it explode?
« Reply #10 on: March 08, 2011, 08:10:25 pm »
I might take a video of it with the lights out, and post it.

The neck board might be damaged.  It looks like whoever had it before me, removed the neckboard somewhat violently.  I don't think I broke anything trying to reattach it.  The pins were all bent.

In anycase it seems more difficult to remove the neckboard with cutting the silicon glue.  Now I'm afraid I'd break the tube.

b3dr0ck

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Re: WG 25 K7000 - could it explode?
« Reply #11 on: March 08, 2011, 09:35:33 pm »
Here's a video of the monitor yoke in the dark


I could have gotten a better video, but fear, and the desire to not totally waste my time, yielded this

Here's a piece of the glass I found - not sure what this is, but I guess it's off the yoke

boardjunkie

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Re: WG 25 K7000 - could it explode?
« Reply #12 on: March 08, 2011, 10:42:19 pm »
Thats the "nipple" off the end of the tube. The monitor was mishandled or bumped pretty hard at the neck end and it got broke off. So, the tube has lost its seal and has air in it now and is useless. Sounds like yer HV section is ok tho ;)

Check the neck board over for cracked solder and possibly cracks in the board itself.