CRT Monitor loses Green

Guest
My CRT monitor loses the green from time to time. Then the screen is
all pink in the background and I can only see red and blue. Just
about the time I'm going to toss it, the green comes back and it has
the excellent color it's had for years. I really hate to toss it out.
I know a fair amount about electronics and have done some tv repair.
This is a 15" computer monitor so it's basically a tv without a tuner.
Besides that, it seems that the only way to get a CRT monitor these
days is a used one on ebay or a garage sale. I really do not want a
LCD monitor, they're too hard to see if they are at a slight angle,
and because I edit graphics, the low priced LCD screens are just too
low in resolution and I can not afford a high end one.

Any idea what might be causing this? The green may be gone for a few
hours or as much as 2 days. Then suddenly it pops right back. The
screen is not only ugly right now (no green at the moment), but hard
to see because it's brightness is reduced without the green. I'll
probably his some garage sales this weekend, but I'd still like to see
if i can fix this one. Appreciate any help.

Thanks

James
 
Start by checking the cable for an intermittent contact or wire. It could be
something as simple as that.

If you have access to another monitor+cable, use them to confirm that the
problem really is with the monitor, and not somewhere else.
 
On Fri, 14 May 2010 09:47:33 -0500, jamesw@eatitall.com wrote:

My CRT monitor loses the green from time to time. Then the screen is
all pink in the background and I can only see red and blue. Just
about the time I'm going to toss it, the green comes back and it has
the excellent color it's had for years. I really hate to toss it out.
I know a fair amount about electronics and have done some tv repair.
This is a 15" computer monitor so it's basically a tv without a tuner.
Besides that, it seems that the only way to get a CRT monitor these
days is a used one on ebay or a garage sale. I really do not want a
LCD monitor, they're too hard to see if they are at a slight angle,
and because I edit graphics, the low priced LCD screens are just too
low in resolution and I can not afford a high end one.

Any idea what might be causing this?
Click to expand...
Bad cable or connector likely.

The green may be gone for a few
hours or as much as 2 days. Then suddenly it pops right back. The
screen is not only ugly right now (no green at the moment), but hard
to see because it's brightness is reduced without the green. I'll
probably his some garage sales this weekend, but I'd still like to see
if i can fix this one. Appreciate any help.

Thanks

James
Click to expand...
 
On Fri, 14 May 2010 09:47:33 -0500, jamesw@eatitall.com wrote:

My CRT monitor loses the green from time to time. Then the screen is
all pink in the background and I can only see red and blue. Just
about the time I'm going to toss it, the green comes back and it has
the excellent color it's had for years. I really hate to toss it out.
I know a fair amount about electronics and have done some tv repair.
This is a 15" computer monitor so it's basically a tv without a tuner.
Besides that, it seems that the only way to get a CRT monitor these
days is a used one on ebay or a garage sale. I really do not want a
LCD monitor, they're too hard to see if they are at a slight angle,
and because I edit graphics, the low priced LCD screens are just too
low in resolution and I can not afford a high end one.

Any idea what might be causing this? The green may be gone for a few
hours or as much as 2 days. Then suddenly it pops right back. The
screen is not only ugly right now (no green at the moment), but hard
to see because it's brightness is reduced without the green. I'll
probably his some garage sales this weekend, but I'd still like to see
if i can fix this one. Appreciate any help.
Click to expand...
Start tapping (bashing) the thing with a hammer (well, I used the plastic
handle of a large screwdriver :) See if you can locate where the
intermittent connection is.

A while back I had a monitor that dropped a colour like yours and even
after opening the thing up and remounting every connector I could see,
right through to the CRT socket, I never found the fault.

By the time I retired the monitor the case plastic was quite marked in
places from the fairly hard bashing I gave it to get the colours back.

Grant.
--
http://bugs.id.au/
 
On 5/14/2010 9:48 AM, Grant wrote:

(...)

Start tapping (bashing) the thing with a hammer (well, I used the plastic
handle of a large screwdriver :) See if you can locate where the
intermittent connection is.
Click to expand...
Suggest gently wiggle the video connector on the back.

--Winston
 
On Fri, 14 May 2010 09:47:33 -0500, jamesw@eatitall.com wrote:
My CRT monitor loses the green from time to time. Then the screen is
all pink in the background and I can only see red and blue. Just
about the time I'm going to toss it, the green comes back and it has
the excellent color it's had for years. I really hate to toss it out.
I know a fair amount about electronics and have done some tv repair.
This is a 15" computer monitor so it's basically a tv without a tuner.
Besides that, it seems that the only way to get a CRT monitor these
days is a used one on ebay or a garage sale. I really do not want a
LCD monitor, they're too hard to see if they are at a slight angle,
and because I edit graphics, the low priced LCD screens are just too
low in resolution and I can not afford a high end one.

Any idea what might be causing this?
Click to expand...
Is it on a KVM? I had one go bad that-a-way.

Jonesy
 
"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in
news:hsjp9j$u2i$1@news.eternal-september.org:

Start by checking the cable for an intermittent contact or wire. It
could be something as simple as that.

If you have access to another monitor+cable, use them to confirm that
the problem really is with the monitor, and not somewhere else.
Click to expand...
often bad solder joints on the CRT socket PCB or wiring from it to the main
board.

--
Jim Yanik
jyanik
at
localnet
dot com
 
Jim Yanik wrote:
"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in
news:hsjp9j$u2i$1@news.eternal-september.org:

Start by checking the cable for an intermittent contact or wire. It
could be something as simple as that.

If you have access to another monitor+cable, use them to confirm that
the problem really is with the monitor, and not somewhere else.




often bad solder joints on the CRT socket PCB or wiring from it to the main
board.
Click to expand...

Or a bad CRT socket.


--
Anyone wanting to run for any political office in the US should have to
have a DD214, and a honorable discharge.
 
<jamesw@eatitall.com> wrote in message
news:m2oqu5lis1d7p2ghrt338vdqrn88gnmjkh@4ax.com...
My CRT monitor loses the green from time to time. Then the screen is
all pink in the background and I can only see red and blue. Just
about the time I'm going to toss it, the green comes back and it has
the excellent color it's had for years. I really hate to toss it out.
I know a fair amount about electronics and have done some tv repair.
This is a 15" computer monitor so it's basically a tv without a tuner.
Besides that, it seems that the only way to get a CRT monitor these
days is a used one on ebay or a garage sale. I really do not want a
LCD monitor, they're too hard to see if they are at a slight angle,
and because I edit graphics, the low priced LCD screens are just too
low in resolution and I can not afford a high end one.

Any idea what might be causing this? The green may be gone for a few
hours or as much as 2 days. Then suddenly it pops right back. The
screen is not only ugly right now (no green at the moment), but hard
to see because it's brightness is reduced without the green. I'll
probably his some garage sales this weekend, but I'd still like to see
if i can fix this one. Appreciate any help.

Thanks

James
Click to expand...
Assuming that the problem is within the monitor, and not as others have
suggested, an external cable problem, then probably 75% of intermittent gun
problems are down to bad joints on the CRT base PCB, where the drive
amplifiers are usually located. Often, the drys are on output transistor
legs.

Arfa
 
Assuming that the problem is within the monitor, and not
as others have suggested, an external cable problem...
Click to expand...
I didn't suggest that the cable was the problem, but rather that that was
where the OP should begin troubleshooting. Has he?
 
"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:hsnlm6$hu8$1@news.eternal-september.org...
Assuming that the problem is within the monitor, and not
as others have suggested, an external cable problem...

I didn't suggest that the cable was the problem, but rather that that was
where the OP should begin troubleshooting. Has he?
Click to expand...
Ah, but you weren't the only one who suggested the possibility of a cable
problem William, which is why I said "others" ... :)

Arfa
 
jamesw@eatitall.com wrote:
My CRT monitor loses the green from time to time. Then the screen is
all pink in the background and I can only see red and blue. Just
about the time I'm going to toss it, the green comes back and it has
the excellent color it's had for years. I really hate to toss it out.
I know a fair amount about electronics and have done some tv repair.
This is a 15" computer monitor so it's basically a tv without a tuner.
Besides that, it seems that the only way to get a CRT monitor these
days is a used one on ebay or a garage sale. I really do not want a
LCD monitor, they're too hard to see if they are at a slight angle,
and because I edit graphics, the low priced LCD screens are just too
low in resolution and I can not afford a high end one.

Any idea what might be causing this? The green may be gone for a few
hours or as much as 2 days. Then suddenly it pops right back. The
screen is not only ugly right now (no green at the moment), but hard
to see because it's brightness is reduced without the green. I'll
probably his some garage sales this weekend, but I'd still like to see
if i can fix this one. Appreciate any help.

Thanks

James



You should, as others have suggested, look for bad connections in the
Click to expand...
signal path. Put a scope on the CRT so you can look for signal when it
goes out.

If it turns out to be the CRT, and you've exhausted all other options,
you might try hitting it with a stun gun.
I've fixed shorted CRT elements that way.
Be careful to get all the electronic stuff VERY FAR AWAY so you don't blow
up good semiconductors in the process.
 
On Sat, 15 May 2010 19:35:28 -0700, "William Sommerwerck"
<grizzledgeezer@comcast.net> wrote:

Assuming that the problem is within the monitor, and not
as others have suggested, an external cable problem...

I didn't suggest that the cable was the problem, but rather that that was
where the OP should begin troubleshooting. Has he?
Click to expand...
Yes, I tried. The cable is part of the monitor so I cant just change
it. But I did wiggle it around on the back of the computer plug and
the rest of the cable. I tried a different monitor on the puter and
tht worked fine. I plugged the bad monitor into another puter and it
was still lacking green. So, it's the monitor. I just replaced it
with another CRT monitor I found at a garage sale for a buck. The new
one is a 15" and the bad one is a 17", so I am going to open it and
look for bad connectors and the CRT plug, loose solder joints, etc.
It's not worth spending a lot of money or time on it, but I'll see if
I can bring it back to full color. The last time the green went out,
it stayed out for 11 days straight. That was getting real annoying to
use. Luckily over the weekend I found this one at the garage sale.

Thanks
 
On 6/9/2010 5:41 AM, jamesw@eatitall.com wrote:

(...)

It's not worth spending a lot of money or time on it, but I'll see if
I can bring it back to full color.
Click to expand...
Have you spritz'ed the video connector with contact cleaner?

If you can locate a loose connector to mate with the monitor
cable, you can run a continuity test. Merely 'buzzing' the
'green' pin to the inside of the monitor won't necessarily
tell you the complete story.

--Winston
 
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