CRT tube - Releasing vacuum for tube removal/disposal

[Simon Webberist]

I need to remove the picture tube from a 14" computer monitor. I'd like
to release the vacuum first because i think i should before i remove the
tensioned wires holding in the tube. I have removed the neck board and
can now see the indexing plastic of the socket. That indexing plastic
is siliconed on with white silicon and i can't seperate it with a knife.
I'm thinking of using a dremel to saw through the indexing plastic as
that is where i'm thinking i should be filing then snapping off anyway.

Does this sound like the way to go? I really want to release the
vacuum. How do people usually let out the vacuum?

I pulled off the Ultor cap where the annode lead attaches, but it's all
glass under it, theres no metal i can drill.

from the faq:

http://www.repairfaq.org/REPAIR/F_monfaqd.html#MONFAQD_011
"The vacuum can be safely released (Let out? Sucked in? What does one do with an unwanted vacuum?)without spectacular effects by breaking the glass seal in the center of the CRT socket (may be hidden by the indexing plastic of the socket). Cover the entire CRT with a heavy blanket when doing this for additional protection. Once the vacuum is gone, it is just a big glass bottle though there may be
some moderately hazardous materials"

I tried searching google, but I couldn't come up with anything except
the same FAQ.

Thanks,
Simon

 

[N Cook]

I need to remove the picture tube from a 14" computer monitor. I'd like
to release the vacuum first because i think i should before i remove the
tensioned wires holding in the tube. I have removed the neck board and
can now see the indexing plastic of the socket. That indexing plastic
is siliconed on with white silicon and i can't seperate it with a knife.
I'm thinking of using a dremel to saw through the indexing plastic as
that is where i'm thinking i should be filing then snapping off anyway.

Does this sound like the way to go? I really want to release the
vacuum. How do people usually let out the vacuum?

I pulled off the Ultor cap where the annode lead attaches, but it's all
glass under it, theres no metal i can drill.

from the faq:

do with an unwanted vacuum?)without spectacular effects by breaking the
glass seal in the center of the CRT socket (may be hidden by the indexing
plastic of the socket). Cover the entire CRT with a heavy blanket when
doing this for additional protection. Once the vacuum is gone, it is just a
big glass bottle though there may be

I tried searching google, but I couldn't come up with anything except
the same FAQ.

Thanks,
Simon

Making defunct CRTs safe
To release the vacuum inside a CRT.Remove the multipole connector from the
neck of the tube and at the centre usually is the point where the air is
evacuated originally and is usually the weakest point.Take outdoors and
place
CRT-face down on cardboard or similar on the ground and
cover the whole CRT with something like the composite back pannel
off the TV with just the centre of the CRT neck exposed.Wearing
goggles lightly tap the weak point with a centre-punch and light
hammer to crack the glass just at this evacuation point.I've never
known the whole CRT tube to implode doing this but the extra
protective cover should be used.
off my tips file
http://www.divdev.fsnet.co.uk/tips.htm
I must have done this to 50 CRTs over the years and nothing more than a hiss
of air inrush

 

[[email protected]]

Simon Webberist wrote:

releasing vacuum from crt:

remove pcb from crt base, where the ring of pins is. In the middle of
that is a glass nipple, breaking this is the safest way to defuse the
bomb. Stand tv upright as usual, place metal bar one end on ground,
other end on the glass nipple. Retreat round corner of building if
paranoid or litigious, or you may become so at any time, and whack the
metal bar downwards with something hard. Sweep up any broken bits,
sometimes the neck end can break.

I pulled off the Ultor cap where the annode lead attaches, but it's all
glass under it, theres no metal i can drill.

leave that alone! A crt broken in the wrong way can go off like a small
bomb.

If you take the vacuum out, wher has it gone?


NT

 

[jakdedert]

Simon Webberist wrote:

releasing vacuum from crt:

remove pcb from crt base, where the ring of pins is. In the middle of
that is a glass nipple, breaking this is the safest way to defuse the
bomb. Stand tv upright as usual, place metal bar one end on ground,
other end on the glass nipple. Retreat round corner of building if
paranoid or litigious, or you may become so at any time, and whack the
metal bar downwards with something hard. Sweep up any broken bits,
sometimes the neck end can break.



leave that alone! A crt broken in the wrong way can go off like a small
bomb.

If you take the vacuum out, wher has it gone?


NT

My favorite way?

1) Set the monitor/tv out in an open field.

2) Carefully take aim with whatever firearm you possess.

3) Fire

4) If desired effect* not achieved, repeat steps 1 - 3 above.

*note: For more spectacular results remove crt from device and aim for
the center of the screen (will require extensive clean up). For minimum
collateral damage, aim for the neck of the tube.

jak

 

[CRaSH]

I need to remove the picture tube from a 14" computer monitor. I'd
like to release the vacuum first because i think i should before i
remove the tensioned wires holding in the tube. I have removed the
neck board and can now see the indexing plastic of the socket. That
indexing plastic is siliconed on with white silicon and i can't
seperate it with a knife. I'm thinking of using a dremel to saw
through the indexing plastic as that is where i'm thinking i should
be filing then snapping off anyway.
Does this sound like the way to go? I really want to release the
vacuum. How do people usually let out the vacuum?

I pulled off the Ultor cap where the annode lead attaches, but it's
all glass under it, theres no metal i can drill.

from the faq:

I tried searching google, but I couldn't come up with anything except
the same FAQ.

Thanks,
Simon

 

[Sam Goldwasser]

Simon Webberist wrote:

releasing vacuum from crt:

remove pcb from crt base, where the ring of pins is. In the middle of
that is a glass nipple, breaking this is the safest way to defuse the
bomb. Stand tv upright as usual, place metal bar one end on ground,
other end on the glass nipple. Retreat round corner of building if
paranoid or litigious, or you may become so at any time, and whack the
metal bar downwards with something hard. Sweep up any broken bits,
sometimes the neck end can break.



leave that alone! A crt broken in the wrong way can go off like a small
bomb.

The cap itself is metal. I've done it both ways but tend to agree that
crushing the exhaust tip at the socket is lower risk.

If you take the vacuum out, wher has it gone?

That IS the real question!

--- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: Anything sent to the email address in the message header above is
ignored unless my full name AND either lasers or electronics is included in the
subject line. Or, you can contact me via the Feedback Form in the FAQs.

 

[Bud--]

Simon Webberist wrote:

releasing vacuum from crt:

remove pcb from crt base, where the ring of pins is. In the middle of
that is a glass nipple, breaking this is the safest way to defuse the
bomb. Stand tv upright as usual, place metal bar one end on ground,
other end on the glass nipple. Retreat round corner of building if
paranoid or litigious, or you may become so at any time, and whack the
metal bar downwards with something hard. Sweep up any broken bits,
sometimes the neck end can break.

I've always broken the very end of the nipple (where fused) with dikes.


Long ago in high school a couple teachers wanted to see how explosive a
crt acutally is. They tossed a small 7" crt into an empty room,
immediately closing the door. They found glass everywhere, including on
top of the window frames.

bud--

 

[Michael A. Terrell]

My favorite way?

1) Set the monitor/tv out in an open field.

2) Carefully take aim with whatever firearm you possess.

3) Fire

4) If desired effect* not achieved, repeat steps 1 - 3 above.

Why do you have to repeat step #1? ;-)


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[kip]

Simple ..I must have done a hundred that way...


Making defunct CRTs safe........etc etc etc

Put it in box look the other way smack the neck with a hammer...job done.

No science here ...yikes

 

[Homer J Simpson]

Long ago in high school a couple teachers wanted to see how explosive a
crt acutally is. They tossed a small 7" crt into an empty room,
immediately closing the door. They found glass everywhere, including on
top of the window frames.

I recall the tale of an Australian serviceman who was replacing a tube and
requested that the family leave the room with their dog. They declined and
he proceeded.

While removing the tube he tripped over the dog and a full implosion
occurred. After that they left the room. It's not clear how long it took to
remove the shards of glass from every surface in there. Even he was
impressed.

 

[Art]

Simple enough but how do you dispose of the materials the crt is composed
of, such as the poisonous phosphor coatings and the leaded glass? Many areas
consider these items HAZMAT and need to be handled appropriately.

 

[Charles Schuler]

Pair of pliers is what you need. Remove the back cap on the neck by
twisting it off with the pliers. Now, you will see a glass tip ... crush it
with the pliers. Eye protection is recommended.

 

[jakdedert]

Why do you have to repeat step #1? ;-)

Gotta point there...might have to move a little closer, though.<g>

jak

 

[Michael A. Terrell]

Gotta point there...might have to move a little closer, though.<g>

jak

I thought it might be gun shy and tried to run away. ;-) My favorite
trick was to remove the plastic guide and use a tiny triangle file on
the thinnest part of the glass, till it started hissing. Some were
still hissing the next morning. It also scared the hell out of people
that weren't supposed to be in that part of the shop. ;-)


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[[email protected]]

I need to remove the picture tube from a 14" computer monitor. I'd like
to release the vacuum first because i think i should before i remove the
tensioned wires holding in the tube. I have removed the neck board and
can now see the indexing plastic of the socket. That indexing plastic
is siliconed on with white silicon and i can't seperate it with a knife.
I'm thinking of using a dremel to saw through the indexing plastic as
that is where i'm thinking i should be filing then snapping off anyway.

Does this sound like the way to go? I really want to release the
vacuum. How do people usually let out the vacuum?

I pulled off the Ultor cap where the annode lead attaches, but it's all
glass under it, theres no metal i can drill.

from the faq:

I tried searching google, but I couldn't come up with anything except
the same FAQ.

Thanks,
Simon

I've only done this with Trinitrons. Small scratch awl in the anode
connection and bop it with a small wieght - a pliers is just fine. It
pokes a little hole to let the air back in (the vacuum out). It just
hisses quietly for a short time. The 20" one was pretty cool but
usually they're just 14" bottles.

GG

 

[jakdedert]

I thought it might be gun shy and tried to run away. ;-) My favorite
trick was to remove the plastic guide and use a tiny triangle file on
the thinnest part of the glass, till it started hissing. Some were
still hissing the next morning. It also scared the hell out of people
that weren't supposed to be in that part of the shop. ;-)

Considering that I don't even own a gun anymore....

I was surprised a couple of times by how 'gently' the vacuum can be
breached. I once did some work on a tv, set it aside for some reason
with the back in place, but unattached. Shortly thereafter, I happened
to bump the set and the back fell down on the neck...hisssssss.

Another candidate for the dumpster.

jak

 

[Bill S.]

I need to remove the picture tube from a 14" computer monitor. I'd like
to release the vacuum first because i think i should before i remove the
tensioned wires holding in the tube. I have removed the neck board and
can now see the indexing plastic of the socket. That indexing plastic
is siliconed on with white silicon and i can't seperate it with a knife.
I'm thinking of using a dremel to saw through the indexing plastic as
that is where i'm thinking i should be filing then snapping off anyway.

I just whack the center of the socket with a hammer. But then I've been
doing it for years and am no longer timid about it.

 

[Michael A. Terrell]

Considering that I don't even own a gun anymore....

I was surprised a couple of times by how 'gently' the vacuum can be
breached. I once did some work on a tv, set it aside for some reason
with the back in place, but unattached. Shortly thereafter, I happened
to bump the set and the back fell down on the neck...hisssssss.

Another candidate for the dumpster.

jak

I tossed one off a cliff up in Kentucky back in the mid '60s. The
neck hit repeatedly on the way down, landed on it face intact. Just as
I was ready to turn and climb back up the hill it imploded. You just
never know.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Len Cutress]

Number 1 Wear Safety Glasses with side shields
2 Wear leather type gloves
3 Place monitor on it's face ,on the floor
4 Cover the back of the tube using a heavy carpet or
blanket,with only socket projecting out
5 Socket has to be removed
6 Use a pick all or the tang of a file,tap soft glass at
seal,with a small hammer
7 After hissing stops, YOU GOT IT MADE

Never had a tube implode in 50 years, hundred's done 3 in. to 32 in

len

 

[Shawn Heil]

Take the monitor to a coworker of mine that thought he knew how to 'fix'
things. In the short time I worked with him, he must have snapped the
yokes off of 5 TV sets and 2 monitors (plus the VCR he dropped down the
stairs). The only thing that exploded was the customers anger when I
told them they would not be getting their item back anytime soon!