My 4th K7000 working on - Green screen - help

[b3dr0ck]

(this thread originated with http://forum.arcadecontrols.com/index.php?topic=119061.0 )

I've never seen any of this work - the tube, or the K7000
I've verified the voltage and the video imput

I took off a K7000 with no HV, and decided to hook up another K7000 that I knew the HV was working, but pulled it from a monitor with a broken yoke.

I plugged up the 2 prong - grounding/deguasse (not sure what it does) wire (can you reverse those?)
I plugged up the 4 prong color wire to the board (they are labled on the board)
I connect the ground wire to the grounding/deguasse thing
Plugged the neck board in (pins dont look great)
Connected power

(connected the video input the second time)

Took a moment a call for assistance if it all blew up

Turned it on, and it worked ... somewhat, at least nothing blew and we had HV, but everything is green - what does that mean?  I know it's getting some correct signal because you can see a faint hint of the game through the green

[grantspain]

means either your green cut off pot needs adjusting,the green drive transistor is short or the green gun in the tube has shorted

first locate and adjust green cut off,if no joy then remove the green drive transistor-if still all green then tube is likely gone

[b3dr0ck]

OK - took the neck board off, and looked and one of the pins were bent.  I straightened it out, plugged it back in, and now the screen is a pinkish yellow color with a band of red on the right hand side.   

The yoke pins and deal do not look good.  (this is a real suck question)  Can the tip of the yoke that plugs into the neck board be replaced?

I'll attach a pic, when I get inside.

(I've got duplicate threads on this - sorry)

[b3dr0ck]

Here are the pics

What do you think?   I hate to toss another CRT because of a bad yoke - they were not take care of.

[grantspain]

tube is knackered mate,neck is beyond help-you will need a new tube

[lilshawn]

you might be able to straighten out that bent pin there (8 o'clock position one) least it looks bent.

as long as the tube hasn't cracked around the pin you might still be good.

EDIT:

looks like you missed aligning the neckboard. gotta make sure you hit it straight or you miss a pin and bend it over. i believe that first pin is for the focus circuit which could explain the funky picture your getting.

[grantspain]

one if the neck pins looks to be missing

[lilshawn]

it's possible, but it's also possible that there is no pin there....check the socket and see if it's stuck in there.

[ed12]

the jug is not the problem
fix the pin's  care-full-ly
that little pice of glass is the end of the neck of the tube
crack it and then u will kiss the tube :jug: night night
once u have the pin's alinged
the lower most pin >the 1 with what look's like there is a >v< in the plastic<
is your foucs pin
with the ammount of times u  have had that neck board on off
and the bend's in the jug pin's i would truly go very slow rebend pin's
and look for bad board connections

ed

[b3dr0ck]

I thought there might be a missing pin there, but I counted another - good neck board - and it has 9 -pins.  This has 9 pins.  What is broken is the plastic housing around the pins, especially the surrounding of the "focus" pin.

I straightened the pins once, and it was a little scary, as those fine cracks in the seal seemed to move.

The other monitor I got with this one, ended up having a cracked yoke - so I know what that looks, and sounds like.
http://forum.arcadecontrols.com/index.php?topic=110243.msg1167973#msg1167973

it's like someone stepped on the yoke of both of these

I'll probably try again today

[grantspain]

strange,every single 25-29" crt i have is 9+1 pin on the neck

[b3dr0ck]

i counted twice, maybe I should go count again.

[lilshawn]

looks like someone tried to twist the board off the tube. its a straight push straight pull .

wonder why the screen would come up green (seemingly fine) but not after. seems like you just missed putting the neck board back and bent over a pin.

only 7 or 8 of those pins of the 10  actually get used, it could be missingcause it wasn't put there.... it could be broken off. hard to tell.

take a look inside the socket on the neck card and see if there is a pin that broke off inside the socket.

[b3dr0ck]

OMG it's working!   

I care-ful-ly straightened some of the pins.  I looked closely at the focus pin socket.  I thought it might have a broken pin in it, but decided that was just the metal of the socket I was seeing.

I finally got the neck board back on, and this time it did look straight, at a right angle.

Powered it up ... and ... nothing, literally no picture at all.  I know I heard the static from the voltage, I checked the neck and saw the little glow, and thought it has to be getting something.  I checked the dials on the neck board and it was completely turned to black.  I did have to replace the control board for the Vsize, V hold, contrast ect... - twice actually.  It had some foldover and the other 2 had broken dials (fix them later).

So ... it works.  It's a little dark, but color is pretty good, very usable.
Thanks guys!

I have 1 more WG25" w/K7000 - that I'll need to fix at some point, but for now Im switching my time to AC wiring
thanks again

[ed12]

just for your futher know
that metal ring is the :spark-gap:

ed

[lilshawn]

cool beans.