Gateway 17" Vivitron is very dim

  • Thread starter Tim Schoenfelder
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Tim Schoenfelder

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I purchased some of these Gateway 17" Vivitron Monitors on a surplus
auction for my nephew. After picking them up, he found that he can
barely see the picture. He mentioned that there doesn't appear to be
any way to really adjust the brightness on the mainboard from what he
can tell.

Does anyone know what is wrong and/or how to brighten the picture up?

Sincerely,
Tim Schoenfelder

BTW, does anyone have schematics for these?
 
Tim Schoenfelder wrote:

I purchased some of these Gateway 17" Vivitron Monitors on a surplus
auction for my nephew. After picking them up, he found that he can
barely see the picture. He mentioned that there doesn't appear to be
any way to really adjust the brightness on the mainboard from what he
can tell.

Does anyone know what is wrong and/or how to brighten the picture up?

Sincerely,
Tim Schoenfelder

BTW, does anyone have schematics for these?
Click to expand...
Probably have many thousands of hours of use on them. About the only
way to get more emission out of the cathode of any CRT is to
'rejuvenate' it. This puts a higher voltage on the heater so that it
really gets hot. Then zapping it with a rejuvenator. Sometimes the
process works, sometimes it fails, sometimes the heater burns out. Ya
takes yer chances. Since the price of a CRT is more than the cost of a
new monitor, it's usually not worth replacing.


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if they are sonys they have a bad cap on the heater line.
if mag you can bump up the g2 on the fly
gateway monitors are made by many manufacturers.
"Tim Schoenfelder" <tim@timschoenfelder.com> wrote in message
news:cPjhb.723446$uu5.119297@sccrnsc04...
I purchased some of these Gateway 17" Vivitron Monitors on a surplus
auction for my nephew. After picking them up, he found that he can
barely see the picture. He mentioned that there doesn't appear to be
any way to really adjust the brightness on the mainboard from what he
can tell.

Does anyone know what is wrong and/or how to brighten the picture up?

Sincerely,
Tim Schoenfelder

BTW, does anyone have schematics for these?
Click to expand...
 
Lizard Blizzard <NOSPAM@rsccd.org> writes:

Tim Schoenfelder wrote:

I purchased some of these Gateway 17" Vivitron Monitors on a surplus
auction for my nephew. After picking them up, he found that he can
barely see the picture. He mentioned that there doesn't appear to
be any way to really adjust the brightness on the mainboard from
what he can tell.
Does anyone know what is wrong and/or how to brighten the picture up?
Sincerely,
Tim Schoenfelder
BTW, does anyone have schematics for these?

Probably have many thousands of hours of use on them. About the only
way to get more emission out of the cathode of any CRT is to
'rejuvenate' it. This puts a higher voltage on the heater so that it
really gets hot. Then zapping it with a rejuvenator. Sometimes the
process works, sometimes it fails, sometimes the heater burns out. Ya
takes yer chances. Since the price of a CRT is more than the cost of
a new monitor, it's usually not worth replacing.
Click to expand...
Before dumping it, there are other possibilities:

1. The digital user brightness and contrast are set too low.
2. The internal G2/screen control on the flyback may need to be adjusted.
3. The CRT filament supply is weak due to a bad connection or bad component.

There are other possibilities but these are the most likely.

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.
 
In article <6wfzi26lv8.fsf@saul.cis.upenn.edu>, sam@saul.cis.upenn.edu
mentioned...
Lizard Blizzard <NOSPAM@rsccd.org> writes:

Tim Schoenfelder wrote:

I purchased some of these Gateway 17" Vivitron Monitors on a surplus
auction for my nephew. After picking them up, he found that he can
barely see the picture. He mentioned that there doesn't appear to
be any way to really adjust the brightness on the mainboard from
what he can tell.
Does anyone know what is wrong and/or how to brighten the picture up?
Sincerely,
Tim Schoenfelder
BTW, does anyone have schematics for these?

Probably have many thousands of hours of use on them. About the only
way to get more emission out of the cathode of any CRT is to
'rejuvenate' it. This puts a higher voltage on the heater so that it
really gets hot. Then zapping it with a rejuvenator. Sometimes the
process works, sometimes it fails, sometimes the heater burns out. Ya
takes yer chances. Since the price of a CRT is more than the cost of
a new monitor, it's usually not worth replacing.

Before dumping it, there are other possibilities:

1. The digital user brightness and contrast are set too low.
2. The internal G2/screen control on the flyback may need to be adjusted.
3. The CRT filament supply is weak due to a bad connection or bad component.

There are other possibilities but these are the most likely.
Click to expand...
One other possibility is that the monitor's insides are so so full of
dust that the high voltages are leaking thru the buildup, causing
losses. Sometimes the dust causes things to get hot, and resistor or
cap values to change. Especially the electrolytic caps.

Of course you have to know what's what, so you can compare what you
measure to what it should be. So you need schematics or a table of
voltages.

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if they are sonys they have a bad cap on the heater line.
if mag you can bump up the g2 on the fly
gateway monitors are made by many manufacturers.
Click to expand...
All Gateway Vivitrons, if memory serves me correctly, are OEM Sony Trinitron
displays. - Reinhart
 
Many thanks for all the responses.

I've emailed my nephew to get the FCCID to confirm the manufacturer.

BTW, Any ideas as where the heater line cap is located located so that I
can point him in the "right direction"?

Tim Schoenfelder

LASERandDVDfan wrote:
if they are sonys they have a bad cap on the heater line.
if mag you can bump up the g2 on the fly
gateway monitors are made by many manufacturers.


All Gateway Vivitrons, if memory serves me correctly, are OEM Sony Trinitron
displays. - Reinhart
Click to expand...
 
In article <6wfzi26lv8.fsf@saul.cis.upenn.edu>, Sam Goldwasser
<sam@saul.cis.upenn.edu> writes

3. The CRT filament supply is weak due to a bad connection or bad component.
Click to expand...
A common fault on these is a leaky cap on the PSU output side which
causes the CRT heater voltage to drop.

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Q. What's the most annoying thing on Usenet?
 
A. Top posters.
Q. What's the most annoying thing on Usenet?
Click to expand...
I'm curious about this portion. I place replies on top, particularly because
there isn't a need to scroll down through a lot of text that's already been
read.

ROT is quicker to read when the original message has already been seen

WB
 
In article <3f872222_5@127.0.0.1>, Wild Bill <kwag98@usachoice.net>
writes

I'm curious about this portion. I place replies on top, particularly because
there isn't a need to scroll down through a lot of text that's already been
read.
Click to expand...
You should neither top-post nor bottom-post but reply in-line, snipping
unnecessary quotes, and quoting enough of the post you're replying to so
as to preserve context.

http://www.caliburn.nl/topposting.html
http://www.faqs.org/rfcs/rfc1855.html
http://www.allmyfaqs.com/faq.pl?How_to_post
http://www.blakjak.demon.co.uk/gey_chr0.htm
http://www.blakjak.demon.co.uk/gey_stv0.htm
http://www.geocities.com/nnqweb/nquote.html
http://www.greenend.org.uk/rjk/2000/06/14/quoting.html
http://www.html-faq.com/faq.php?clue=topposting
http://www.ietf.org/rfc/rfc1855.txt
http://www.jsiinc.com/newsgroup_document.htm
http://www.malibutelecom.fi/yucca/usenet/brox.html
http://www.newsreaders.com/
http://www.planefacts.ndirect.co.uk/group/advice/
http://www.plig.net/nnq/nquote.html
http://www.star-one.org.uk/computer/format.htm
http://www.usenet.org.uk/ukpost.html#s3
http://www.uwasa.fi/~ts/http/quote.html

--
A. Top posters.
Q. What's the most annoying thing on Usenet?
 
So much for netiquette then.. the line-by-line replies are even more time
consuming to either read or edit/reply.

Maybe Microsoft can develop an easy solution to this, too.

WB
ill-mannered, non-conformist usenet swine
...............

"Mike Tomlinson" <mike@NOSPAM.jasper.org.uk> wrote in message
news:axglYDKsx1h$Ew92@jasper.org.uk...
In article <3f872222_5@127.0.0.1>, Wild Bill <kwag98@usachoice.net
writes

I'm curious about this portion. I place replies on top, particularly
because
there isn't a need to scroll down through a lot of text that's already
been
read.

You should neither top-post nor bottom-post but reply in-line, snipping
unnecessary quotes, and quoting enough of the post you're replying to so
as to preserve context.

http://www.caliburn.nl/topposting.html
http://www.faqs.org/rfcs/rfc1855.html
http://www.allmyfaqs.com/faq.pl?How_to_post
http://www.blakjak.demon.co.uk/gey_chr0.htm
http://www.blakjak.demon.co.uk/gey_stv0.htm
http://www.geocities.com/nnqweb/nquote.html
http://www.greenend.org.uk/rjk/2000/06/14/quoting.html
http://www.html-faq.com/faq.php?clue=topposting
http://www.ietf.org/rfc/rfc1855.txt
http://www.jsiinc.com/newsgroup_document.htm
http://www.malibutelecom.fi/yucca/usenet/brox.html
http://www.newsreaders.com/
http://www.planefacts.ndirect.co.uk/group/advice/
http://www.plig.net/nnq/nquote.html
http://www.star-one.org.uk/computer/format.htm
http://www.usenet.org.uk/ukpost.html#s3
http://www.uwasa.fi/~ts/http/quote.html

--
A. Top posters.
Q. What's the most annoying thing on Usenet?
Click to expand...
 
Mike Tomlinson wrote:
In article <6wfzi26lv8.fsf@saul.cis.upenn.edu>, Sam Goldwasser
sam@saul.cis.upenn.edu> writes


3. The CRT filament supply is weak due to a bad connection or bad component.


A common fault on these is a leaky cap on the PSU output side which
causes the CRT heater voltage to drop.

Thanks, I'll try to find the cap (or caps?). This looks like something
Click to expand...
that I need to look for on a couple other types of monitors that I've
got also.

FWIIW, the help/info that you guys provided on this thread/topic is huge!

Tim
 
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