I've got a Mitsubishi M1GA 39" with weak green. I've been trying to
check and trace everything in the chroma area and have come up with
nothing. Maybe it's just an old weak CRT but what has been driving me
crazy is that the on screen display looks perfect. The characters are
either red yellow or green and they look as good as new. The chroma
chip ia a M51414BSP and it shows RGB inputs for the on screen display
which I assume are generated from the CPU. If the on screen display
is a perfect pure green shouldn't that say that the CRTs green gun is
functional? As far as I can tell I have good chroma up to the IC but
after it the green seems to be out to lunch. If I try messing with
the
green cut off all that happens is the picture gets washed out with
luminance but very little green. I replaced the chip but that did
nothing and there are no more electrolytics to replace. There is a
dynamic white circuit and a color temp circuit between the chroma IC
and the CRT board with the drivers. All check good. Any ideas? tia
Karl

Have you tried replacing the cable from the computer to the monitor?
I don't know a lot about monitors but was having this problem with one
of the LCD projectors I work with and a bad VGA cable was the culprit.


On Dec 31, 10:51 am, Floyd Gilmour wrote:
I've got a Mitsubishi M1GA 39" with weak green. I've been trying to
check and trace everything in the chroma area and have come up with
nothing. Maybe it's just an old weak CRT but what has been driving me
crazy is that the on screen display looks perfect. The characters are
either red yellow or green and they look as good as new. The chroma
chip ia a M51414BSP and it shows RGB inputs for the on screen display
which I assume are generated from the CPU. If the on screen display
is a perfect pure green shouldn't that say that the CRTs green gun is
functional? As far as I can tell I have good chroma up to the IC but
after it the green seems to be out to lunch. If I try messing with
the
green cut off all that happens is the picture gets washed out with
luminance but very little green. I replaced the chip but that did
nothing and there are no more electrolytics to replace. There is a
dynamic white circuit and a color temp circuit between the chroma IC
and the CRT board with the drivers. All check good. Any ideas? tia
Karl

Er, whatever your video source is to the TV, not necessarily a
computer...

On Dec 31, 11:05 am, Videlectrix wrote:
Have you tried replacing the cable from the computer to the monitor?
I don't know a lot about monitors but was having this problem with one
of the LCD projectors I work with and a bad VGA cable was the culprit.

On Dec 31, 10:51 am, Floyd Gilmour wrote:

I've got a Mitsubishi M1GA 39" with weak green. I've been trying to
check and trace everything in the chroma area and have come up with
nothing. Maybe it's just an old weak CRT but what has been driving me
crazy is that the on screen display looks perfect. The characters are
either red yellow or green and they look as good as new. The chroma
chip ia a M51414BSP and it shows RGB inputs for the on screen display
which I assume are generated from the CPU. If the on screen display
is a perfect pure green shouldn't that say that the CRTs green gun is
functional? As far as I can tell I have good chroma up to the IC but
after it the green seems to be out to lunch. If I try messing with
the
green cut off all that happens is the picture gets washed out with
luminance but very little green. I replaced the chip but that did
nothing and there are no more electrolytics to replace. There is a
dynamic white circuit and a color temp circuit between the chroma IC
and the CRT board with the drivers. All check good. Any ideas? tia
Karl