No screen adjustment?

Guest
I have a Dell UltraScan P991 (AKA Sony) monitor that exibits excessive
screen briteness and retrace lines. Opening it up and there is no pot
adjustment for screen
or G2 on the flyback or anywhere else I see. Is this adjusted with DAS
only?
If so, is there a workaround so I can adjust the screen voltage?
Any and all constructive comments welcome. Thanks!
 
Fix the fault then it will be ok.

kip

--
"Watch the return E-Mail addy its false"
<Express243@Hotmail.com> wrote in message
news:40AE8BCD.D53402DA@Hotmail.com...
I have a Dell UltraScan P991 (AKA Sony) monitor that exibits excessive
screen briteness and retrace lines. Opening it up and there is no pot
adjustment for screen
or G2 on the flyback or anywhere else I see. Is this adjusted with DAS
only?
If so, is there a workaround so I can adjust the screen voltage?
Any and all constructive comments welcome. Thanks!
 
Adjusted with DAS only, there is no workaround. Troubleshoot the fault for
standard bright with retrace first and rule out all other possibilities. It
is poossible the video output ic has failed, or the video b+ is low.

David

"john" <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$by73yh$rii$1@newsfeed.niagara.com...
Fix the fault then it will be ok.

kip

--
"Watch the return E-Mail addy its false"
Express243@Hotmail.com> wrote in message
news:40AE8BCD.D53402DA@Hotmail.com...
I have a Dell UltraScan P991 (AKA Sony) monitor that exibits excessive
screen briteness and retrace lines. Opening it up and there is no pot
adjustment for screen
or G2 on the flyback or anywhere else I see. Is this adjusted with DAS
only?
If so, is there a workaround so I can adjust the screen voltage?
Any and all constructive comments welcome. Thanks!
 
Thanks guys,
I have yet to tear into it looking for faults. I have to clear a number of
other items off my bench before I start. It just looked to me like a screen
adjustment because it has a decent and proper display. I will keep the
following items in mind.

David wrote:

Adjusted with DAS only, there is no workaround. Troubleshoot the fault for
standard bright with retrace first and rule out all other possibilities. It
is poossible the video output ic has failed, or the video b+ is low.

David

"john" <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$by73yh$rii$1@newsfeed.niagara.com...
Fix the fault then it will be ok.

kip

--
"Watch the return E-Mail addy its false"
Express243@Hotmail.com> wrote in message
news:40AE8BCD.D53402DA@Hotmail.com...
I have a Dell UltraScan P991 (AKA Sony) monitor that exibits excessive
screen briteness and retrace lines. Opening it up and there is no pot
adjustment for screen
or G2 on the flyback or anywhere else I see. Is this adjusted with DAS
only?
If so, is there a workaround so I can adjust the screen voltage?
Any and all constructive comments welcome. Thanks!
 
<Express243@Hotmail.com> wrote in message
news:40AE8BCD.D53402DA@Hotmail.com...
I have a Dell UltraScan P991 (AKA Sony) monitor that exibits
excessive
screen briteness and retrace lines. Opening it up and there is
no pot
adjustment for screen
or G2 on the flyback or anywhere else I see. Is this adjusted
with DAS
only?
If so, is there a workaround so I can adjust the screen
voltage?
Any and all constructive comments welcome. Thanks!

Sometimes divider resistors change value or open, the values can
be changes to your advantage too, in a pinch...
 
Possible that there is an adjustment physically on the crt drive board.
Check for leaky caps on the G2 supply line, check the video bias voltages
and caps on that suppply line. Etc. Suspect you will find either defective
caps or maybe resistors that have changed values.
"Vector Viper" <ahowald@w-link.net> wrote in message
news:10atqkd3tlsg009@corp.supernews.com...
Express243@Hotmail.com> wrote in message
news:40AE8BCD.D53402DA@Hotmail.com...
I have a Dell UltraScan P991 (AKA Sony) monitor that exibits
excessive
screen briteness and retrace lines. Opening it up and there is
no pot
adjustment for screen
or G2 on the flyback or anywhere else I see. Is this adjusted
with DAS
only?
If so, is there a workaround so I can adjust the screen
voltage?
Any and all constructive comments welcome. Thanks!

Sometimes divider resistors change value or open, the values can
be changes to your advantage too, in a pinch...
 
This is a common problem - search the Monitor Repair Forum at
http://www.network54.com/Forum/87612
for the string 'Dell P991 Brightness' and sort by 'Match'
You will get a lot of posts on this problem; looks like there is a
hardware fix.

Wayne

On Fri, 21 May 2004 20:05:48 -0500, "David" <dkuhajda@locl.net.spam>
wrote:

Adjusted with DAS only, there is no workaround. Troubleshoot the fault for
standard bright with retrace first and rule out all other possibilities. It
is poossible the video output ic has failed, or the video b+ is low.

David

"john" <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$by73yh$rii$1@newsfeed.niagara.com...
Fix the fault then it will be ok.

kip

--
"Watch the return E-Mail addy its false"
Express243@Hotmail.com> wrote in message
news:40AE8BCD.D53402DA@Hotmail.com...
I have a Dell UltraScan P991 (AKA Sony) monitor that exibits excessive
screen briteness and retrace lines. Opening it up and there is no pot
adjustment for screen
or G2 on the flyback or anywhere else I see. Is this adjusted with DAS
only?
If so, is there a workaround so I can adjust the screen voltage?
Any and all constructive comments welcome. Thanks!
 
However, the main point to emphasize is that if these symptoms happened
suddenly, the problem isn't an adjustment. Only except might be that
if the function is controlled via software, a corrupt EEPROM could cause
it.

--- 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.



"Art" <stubby@comcast.net> writes:

Possible that there is an adjustment physically on the crt drive board.
Check for leaky caps on the G2 supply line, check the video bias voltages
and caps on that suppply line. Etc. Suspect you will find either defective
caps or maybe resistors that have changed values.
"Vector Viper" <ahowald@w-link.net> wrote in message
news:10atqkd3tlsg009@corp.supernews.com...

Express243@Hotmail.com> wrote in message
news:40AE8BCD.D53402DA@Hotmail.com...
I have a Dell UltraScan P991 (AKA Sony) monitor that exibits
excessive
screen briteness and retrace lines. Opening it up and there is
no pot
adjustment for screen
or G2 on the flyback or anywhere else I see. Is this adjusted
with DAS
only?
If so, is there a workaround so I can adjust the screen
voltage?
Any and all constructive comments welcome. Thanks!

Sometimes divider resistors change value or open, the values can
be changes to your advantage too, in a pinch...
 

Welcome to EDABoard.com

Sponsor

Back
Top