Troubleshooting procedure for monitor color missing problem

[valutek]

My old Sony (SFII 17" model) is not displaying the color correctly --
The screen seems more redish and less blue-ish. Other things are just
fine except this color loss problem.

My (and others') first suspect is the problem with the video cable. I
took the cable out from the monitor and checked the resistance for
each pin and their terminal side. All colors pin (pin 1,2,3) have
around 75 ohm and their return (6,7,8) are 0 value. Pin 13, 14 seems
fine, too.

This result puzzles me a bit and I need to confirm these results are
actually right. I am thinking swap the color cables ( R, G, B) on the
monitor side. How can I achive this safely and logically?

Also what is the next step for the troubleshooting? I believed that I
already googled some detailed monitor diagnosis steps in the web but
could not find it any more. Could anyone point me to the right
directions?

Please also send a copy of reply to winstonmei@hotmail.com when
following this post.

Thanks

Winston

 

[Marco]

valutek wrote:

My old Sony (SFII 17" model) is not displaying the color correctly --
The screen seems more redish and less blue-ish. Other things are just
fine except this color loss problem.

My (and others') first suspect is the problem with the video cable. I
took the cable out from the monitor and checked the resistance for
each pin and their terminal side. All colors pin (pin 1,2,3) have
around 75 ohm and their return (6,7,8) are 0 value. Pin 13, 14 seems
fine, too.

This result puzzles me a bit and I need to confirm these results are
actually right. I am thinking swap the color cables ( R, G, B) on the
monitor side. How can I achive this safely and logically?

Also what is the next step for the troubleshooting? I believed that I
already googled some detailed monitor diagnosis steps in the web but
could not find it any more. Could anyone point me to the right
directions?

Please also send a copy of reply to winstonmei@hotmail.com when
following this post.

Thanks

Winston

Hi

I have a similair 15" model.
There are some power resistors on one of the PCBs. They haven't been
mounted the way it should (don't know how to explain in English,
sorry...) Remove the solder, apply some new, and it will probably work fine.

You can test bij displaying a pic and with a pice of plastic pushing the
components. If the pic changes, you found the loose contact.

Good luck
Marco

 

[mike]

valutek wrote:

My old Sony (SFII 17" model) is not displaying the color correctly --
The screen seems more redish and less blue-ish. Other things are just
fine except this color loss problem.

My (and others') first suspect is the problem with the video cable. I
took the cable out from the monitor and checked the resistance for
each pin and their terminal side. All colors pin (pin 1,2,3) have
around 75 ohm and their return (6,7,8) are 0 value. Pin 13, 14 seems
fine, too.

This result puzzles me a bit and I need to confirm these results are
actually right. I am thinking swap the color cables ( R, G, B) on the
monitor side. How can I achive this safely and logically?

Also what is the next step for the troubleshooting? I believed that I
already googled some detailed monitor diagnosis steps in the web but
could not find it any more. Could anyone point me to the right
directions?

Check the solder joints on the CRT pins.

Please also send a copy of reply to winstonmei@hotmail.com when
following this post.

Or you could come back to read the posts we thoughtfully posted
in response to your query.
mike

Thanks

Winston

--
Return address is VALID.
Bunch of stuff For Sale and Wanted at the link below.
Toshiba & Compaq LiIon Batteries, Test Equipment
Honda CB-125S $800 in PDX
TEK Sampling Sweep Plugin and RM564
Tek 2465 $800, ham radio, 30pS pulser
Tektronix Concept Books, spot welding head...
http://www.geocities.com/SiliconValley/Monitor/4710/

 

[Jerry Greenberg]

What you are measuring are the 75 ohm termination resistors for the
video, signal sense, and the ground return references. This is okay.

The monitor has a fault condition in the video amp section, or the
tube itself may be a bit weak, therefore unballanced in its
electron-gun drive.


Jerry Greenberg
http://www.zoom-one.com

--


valutek@hotmail.com (valutek) wrote in message news:<6f5240fd.0401021111.6dae95a8@posting.google.com>...

My old Sony (SFII 17" model) is not displaying the color correctly --
The screen seems more redish and less blue-ish. Other things are just
fine except this color loss problem.

My (and others') first suspect is the problem with the video cable. I
took the cable out from the monitor and checked the resistance for
each pin and their terminal side. All colors pin (pin 1,2,3) have
around 75 ohm and their return (6,7,8) are 0 value. Pin 13, 14 seems
fine, too.

This result puzzles me a bit and I need to confirm these results are
actually right. I am thinking swap the color cables ( R, G, B) on the
monitor side. How can I achive this safely and logically?

Also what is the next step for the troubleshooting? I believed that I
already googled some detailed monitor diagnosis steps in the web but
could not find it any more. Could anyone point me to the right
directions?

Please also send a copy of reply to winstonmei@hotmail.com when
following this post.

Thanks

Winston

 

[Sam Goldwasser]

valutek@hotmail.com (valutek) writes:

My old Sony (SFII 17" model) is not displaying the color correctly --
The screen seems more redish and less blue-ish. Other things are just
fine except this color loss problem.

My (and others') first suspect is the problem with the video cable. I
took the cable out from the monitor and checked the resistance for
each pin and their terminal side. All colors pin (pin 1,2,3) have
around 75 ohm and their return (6,7,8) are 0 value. Pin 13, 14 seems
fine, too.

This result puzzles me a bit and I need to confirm these results are
actually right. I am thinking swap the color cables ( R, G, B) on the
monitor side. How can I achive this safely and logically?

Why, it sounds like what one would expect. The video lines are terminated
in 75 ohms.

Also what is the next step for the troubleshooting? I believed that I
already googled some detailed monitor diagnosis steps in the web but
could not find it any more. Could anyone point me to the right
directions?

You need to determine if the problem is a missing color or just a weak
color, and whether it happened suddenly, or you just noticed it.

Please also send a copy of reply to winstonmei@hotmail.com when
following this post.

Sorry, post here, read here. This isn't a free private consulting service.

--- 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.

 

[James Sweet]

Please also send a copy of reply to winstonmei@hotmail.com when
following this post.

Sorry, post here, read here. This isn't a free private consulting
service.

Is it really that unreasonable to click the other button and post to the
group as well as email him directly? I often do that if their addy isn't
munged, that way the answer is public as well as going directly, less likely
to get lost in the usenet jungle and wasted.

 

[Sam Goldwasser]

"James Sweet" <jamessweet@hotmail.com> writes:

Please also send a copy of reply to winstonmei@hotmail.com when
following this post.

Sorry, post here, read here. This isn't a free private consulting
service.

Is it really that unreasonable to click the other button and post to the
group as well as email him directly? I often do that if their addy isn't
munged, that way the answer is public as well as going directly, less likely
to get lost in the usenet jungle and wasted.

But the original poster may miss any followups. So, if the first reply
says to "connect the 115 VAC to your tongue", the original poster dutifully
follows then definitely misses the followups.

More personally, it bothers me that we as good citizens spend countless
hours on these NGs helping others but someone comes along for a quick fix
and can't be bothered to read the group at all. They can always reliably
find the group on Googlegroups even if their ISP doesn't catch all postings.

For the most part, there people haven't read the FAQs, haven't searched for
past threads, haven't spent the time to do the minimal research.

Sorry, maybe I'll mellow eventually. ;-)

--- 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.