Monitor image has right edge ghosts...

B

Brian

Guest
Hello:

I have an Iilyama 502 21" high resolution video monitor - on high contrast
images it exhibits some ghosting on the right edge. This ghosting can be 2
or 3 evenly spaced edges following the the true edge.

I know there is edge enhancing circuitry but I am looking for some clues.

Anybody have any ideas?

Thanks,

Brian
 
Brian wrote:
Hello:

I have an Iilyama 502 21" high resolution video monitor - on high contrast
images it exhibits some ghosting on the right edge. This ghosting can be 2
or 3 evenly spaced edges following the the true edge.

I know there is edge enhancing circuitry but I am looking for some clues.

Anybody have any ideas?

Thanks,

Brian
Click to expand...
Hi Brian...

Can't help much, but given that my lifetime
passionate hobby is photography (now digital, of
course) I can guarantee you without a doubt that
edge enhancement will just make it much worse :(

I'm getting a little long in the tooth, but I
suspect what you're suffering is what we back in
my old broadcast days was called ringing.

And I'm pretty sure that you want to look around
for flakey caps in the damper area.

Hope that helps just a little.

Take care.

Ken
 
Start with cables and termination.

--- sam | Sci.Electronics.Repair FAQ Home Page: 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 Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the feedback form on the S.E.R FAQ Web sites.



Ken Weitzel <kweitzel@shaw.ca> writes:

Brian wrote:
Hello:
I have an Iilyama 502 21" high resolution video monitor - on high
contrast
images it exhibits some ghosting on the right edge. This ghosting can be 2
or 3 evenly spaced edges following the the true edge.
I know there is edge enhancing circuitry but I am looking for some
clues.
Anybody have any ideas?
Thanks,
Brian


Hi Brian...

Can't help much, but given that my lifetime
passionate hobby is photography (now digital, of
course) I can guarantee you without a doubt that
edge enhancement will just make it much worse :(

I'm getting a little long in the tooth, but I
suspect what you're suffering is what we back in
my old broadcast days was called ringing.

And I'm pretty sure that you want to look around
for flakey caps in the damper area.

Hope that helps just a little.

Take care.

Ken
Click to expand...
 
Ken Weitzel wrote:
Brian wrote:

I have an Iilyama 502 21" high resolution video monitor - on high
contrast images it exhibits some ghosting on the right edge. This
ghosting can be 2 or 3 evenly spaced edges following the the true edge.

I know there is edge enhancing circuitry but I am looking for some clues.

Anybody have any ideas?

Can't help much, but given that my lifetime
passionate hobby is photography (now digital, of
course) I can guarantee you without a doubt that
edge enhancement will just make it much worse :(

I'm getting a little long in the tooth, but I
suspect what you're suffering is what we back in
my old broadcast days was called ringing.
Click to expand...
That is exactly what is happening! If I were seeing this in an amplifier,
that is precisely what I would call it.

And I'm pretty sure that you want to look around
for flakey caps in the damper area.
Click to expand...
That makes sense! Look for problems in the horizontal amplifiers.

Hope that helps just a little.
Take care.
Click to expand...
Thanks for the tip - just what I was looking for.

Now to get a schematic for the Iiyama Vision Master.

Best regards,

Brian
 
This is commonly caused by an open termination, or caps along the video path
that are becoming down in value. You can use an ESR meter to check the caps.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Brian" <brian@stanley-park.com> wrote in message
news:DfU%b.616842$JQ1.67004@pd7tw1no...
Hello:

I have an Iilyama 502 21" high resolution video monitor - on high contrast
images it exhibits some ghosting on the right edge. This ghosting can be 2
or 3 evenly spaced edges following the the true edge.

I know there is edge enhancing circuitry but I am looking for some clues.

Anybody have any ideas?

Thanks,

Brian
 
Ken Weitzel <kweitzel@shaw.ca> wrote in message news:<4040191C.8090207@shaw.ca>...
Brian wrote:
Hello:

I have an Iilyama 502 21" high resolution video monitor - on high contrast
images it exhibits some ghosting on the right edge. This ghosting can be 2
or 3 evenly spaced edges following the the true edge.

I know there is edge enhancing circuitry but I am looking for some clues.

Anybody have any ideas?

Thanks,

Brian


Hi Brian...

Can't help much, but given that my lifetime
passionate hobby is photography (now digital, of
course) I can guarantee you without a doubt that
edge enhancement will just make it much worse :(

I'm getting a little long in the tooth, but I
suspect what you're suffering is what we back in
my old broadcast days was called ringing.

And I'm pretty sure that you want to look around
for flakey caps in the damper area.

Hope that helps just a little.

Take care.

Ken
Click to expand...

Most likely, there is a mis-termination of the luminance signal. In
vacuum tube and early transistor days, it was caused by changes in the
delay line characteristics or the termination. Nowadays this is
handled digitally, and I don't know what the equivalent would be. The
poster doesn't say if this is a new problem, or was there from the
beginning, so it's hard to speculate any further.

H. R. (Bob) Hofmann
 
Cables are easier to check first, like an extension cable that introduces a
point of reflection. If this is the case it will worsen at higher
resolutions as vertical frequency goes up.
--
They can have my command prompt when they pry it from my cold dead fingers.

"Jerry G." <jerryg50@hotmail.com> wrote in message
news:c1qa9o$rp0$3@news.eusc.inter.net...
This is commonly caused by an open termination, or caps along the video
path
that are becoming down in value. You can use an ESR meter to check the
caps.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Brian" <brian@stanley-park.com> wrote in message
news:DfU%b.616842$JQ1.67004@pd7tw1no...
Hello:

I have an Iilyama 502 21" high resolution video monitor - on high contrast
images it exhibits some ghosting on the right edge. This ghosting can be 2
or 3 evenly spaced edges following the the true edge.

I know there is edge enhancing circuitry but I am looking for some clues.

Anybody have any ideas?

Thanks,

Brian
Click to expand...
 
Thanks to all.

The Iiyama Vision Master 21" I recently bought used at a local computer swap
meet. When I looked at the image at the show it looked pretty good (bright
lights - moderate resolution).

Now that I have it in my shop and am running it at 1600 x 1200 @ 88 Hz the
"ringing" is noticable.

I will have a look at the cabling first and move on from there.

Thanks again everybody who posted.

I will post an update when I have a look this weekend,

Best regards,

Brian
 
Hello Again:

First fo all, thank you all for you suggestions, I am progressing through
them all.

First off, a little more information about the Iiyama Vision Master 502
monitor.

It is en extremely heavy (68 Lbs) 21" monitor featuring very high resolution
(1800 x 1440 @ 75 Hz) with razor sharp .22 mm dot pitch.

I am running the monitor at 1400 x 1200 @ 88 Hz.

The input is either a conventional D-Sub mini 15 pin connector and 5 BNC
connectors. I am using the D-Sub mini 15 pin connector and the stock cable
that came with the monitor.

What I have tried so far: I changed the stock cable for a cable that came
wih my hi-res ViewSonic 19" monitor that I knew was perfectly functional -
exact same ghosting.

I then tried two different video cards, the primary card is an nVidia
FX5200, the second choice was an nVidia MX400 and the third choice was a
Matrox Mystique. Same ghosting apparent.

A very close look at the ghosting reveals that there are three distinctive
ghosts or rings after every edge - it is faint be viewable.

Can someone suggest the next step?

Would it be acceptable for me to post a small graphic if I can get one with
my camera?

Thanks again for your help.

Best regards,

Brian
 
"Brian" <brian@stanley-park.com> wrote in message
news:IIo0c.646019$X%5.128074@pd7tw2no...
Hello Again:

First fo all, thank you all for you suggestions, I am progressing through
them all.

First off, a little more information about the Iiyama Vision Master 502
monitor.

It is en extremely heavy (68 Lbs) 21" monitor featuring very high
resolution
(1800 x 1440 @ 75 Hz) with razor sharp .22 mm dot pitch.

I am running the monitor at 1400 x 1200 @ 88 Hz.

The input is either a conventional D-Sub mini 15 pin connector and 5 BNC
connectors. I am using the D-Sub mini 15 pin connector and the stock cable
that came with the monitor.

What I have tried so far: I changed the stock cable for a cable that came
wih my hi-res ViewSonic 19" monitor that I knew was perfectly functional -
exact same ghosting.

I then tried two different video cards, the primary card is an nVidia
FX5200, the second choice was an nVidia MX400 and the third choice was a
Matrox Mystique. Same ghosting apparent.

A very close look at the ghosting reveals that there are three distinctive
ghosts or rings after every edge - it is faint be viewable.

Can someone suggest the next step?

Would it be acceptable for me to post a small graphic if I can get one
with
my camera?

Thanks again for your help.

Best regards,

Brian
Click to expand...
You could look on the neck board for leaking/bulging capacitors, but beyond
that there's not much you can do aside from taking it to a shop, sounds like
a nice monitor, careful not to break it worse.
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top