Green Screen


D

Dave McMahon

Hello

I have a prob with my second screen (Dell P1110) it has a tint of green! The
monitor is fine (runs okay as the primary screen) and other monitors (A 17"
CRT also run green in the second connector. My GPU is a ATI 9600XT AIW
 
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N

Not Gimpy Anymore

Dave McMahon said:
Hello

I have a prob with my second screen (Dell P1110) it has a tint of green!
The
monitor is fine (runs okay as the primary screen) and other monitors (A
17"
CRT also run green in the second connector. My GPU is a ATI 9600XT AIW
Sounds like the "second connector" has a "white balance" problem - that
is to
say when you want to display white, the analog values for R, G, & B should
be
closely identical (as much as can be expected, given production tolerances),
and
what you are getting is a signal where the G amplitude is higher than the
other two.
This is indicated by the fact that different monitors connected to that
"spiggot" all
have Green shading.
Can't tell if this has happened recently, over time, or since the start -
which may
have an impact on the recommended approach to cure. The most obvious cure is
to replace the "second connector" electronics - but you have to define what
that
means - is it a second video card, or a second connector on the single card?

Not much help, but not much info to go on either.

NGA
 
D

Dave McMahon

Yes sorry not much information! Okay it's a ATI 9600XT AIW it has a dongle
cable for output and a dongle cable cable for input, so hopefully changing
that will help! The screen looks more yellow now! Can you get vga loopback
test connectors???
 
B

Bob Myers

Not Gimpy Anymore said:
Sounds like the "second connector" has a "white balance" problem - that
is to
say when you want to display white, the analog values for R, G, & B should
be
closely identical (as much as can be expected, given production tolerances),
and
what you are getting is a signal where the G amplitude is higher than the
other two.
One thing I always wonder when a "green screen" comes up is whether
or not the graphic system in question supports sync-on-green, and if
that happens to have somehow been switched on. For a typical PC
monitor, sync-on-green is NOT used, and many monitors don't know
how to properly handle it should it be present (or maybe they do, but
need to be switched into a "sync-on-green" mode to work correctly).
With a sync pulse present on the green signal, there's a chance that the
monitor will mistakenly see the sync level as the reference (blank)
level, and this effectively boosts the green by almost 50% of its
normal amplitude.

Might not be, but it's usually something that's easy to fix if this IS the
problem. Check the documentation for your graphics card.

Bob M.
 
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D

Dave McMahon

Just checked the muti-out cable and one of the pins was bent and touching
the Earth!!! it works fine now (although my Lacie 22" monitor is crap
compared to the Dell P1110!!!
 

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