21 Oct
2002
21 Oct
'02
7:08 p.m.
I've got a rebadged Sony GDM-20E20 and GDM-20D11 that have some issues and
was wondering if anyone had technical information about them. The E20
seems to have HV ok, but doesn't display any picture - but it appears to
be powered up ok. The D11 won't switch out of powersave mode.
If anyone has any info, reply to me off-list
Pat
--
"This fucking university has shown time and time again that it is
completely fucking incompetent when it comes to employing technology"
-- Anonymous
http://dilbert.com/comics/dilbert/archive/images/dilbert2040637020924.gif
21 Oct
21 Oct
9:12 p.m.
--- Patrick Finnegan <pat(a)purdueriots.com> wrote:
I've got a rebadged Sony GDM-20E20 and GDM-20D11
that have some issues...
Me, too. I have a GDM-20E20 that's gotten all fuzzy (not convergence -
it's achromatic). Love to know what I can tweak.
Thanks,
-ethan
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22 Oct
22 Oct
6:40 p.m.
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8:34 p.m.
At 11:49 PM 10/22/02 +0100, you wrote:
I've noticed that on the sun/sony monitors they seem to use undersized
flyback xformers in the bigger models. they are using the same flyback in
the 16's that they use in the 19's and 21's :(
--- Patrick Finnegan <pat(a)purdueriots.com> wrote:
_Nothing_!!!
When a fault develops, it is almost _never_ cured by an adjustment. There
is an actual component failure that you need to trace and fix. I've got a rebadged Sony GDM-20E20 and
GDM-20D11 that have some issues...
Me, too. I have a GDM-20E20 that's gotten all fuzzy (not convergence -
it's achromatic). Love to know what I can tweak. 
10:42 p.m.
Geoff Reed <geoffr(a)zipcon.net> wrote:
I've noticed that on the sun/sony monitors they
seem to use undersized
flyback xformers in the bigger models. they are using the same flyback
in the 16's that they use in the 19's and 21's :(
Assuming that the minimum size of the flyback needs to scale with the size
of the tube (and I'm not certain that it does, from empirical observations),
the use of the same size in a 16 and a 21 doesn't necessarily mean that the
one in the 16 is too small. It could just as easily have chosen one
flyback that is adequate for a 21, and used it across the product line.
23 Oct
23 Oct
1:08 a.m.
At 08:43 PM 10/22/02 -0700, you wrote:
Geoff Reed <geoffr(a)zipcon.net> wrote:
Nope, the sun 19 and 21 inchers (at least the early ones) tended to be
built with flybacks that were specced for the 16" monitors, later models
had one type of flyback in the 16 and 19's and a different one in the 20's
and 21's. the flyback was heavier duty and tended not to fail as quickly.
I've noticed that on the sun/sony monitors
they seem to use undersized
flyback xformers in the bigger models. they are using the same flyback
in the 16's that they use in the 19's and 21's :(
Assuming that the minimum size of the flyback needs to scale with the size
of the tube (and I'm not certain that it does, from empirical observations),
the use of the same size in a 16 and a 21 doesn't necessarily mean that the
one in the 16 is too small. It could just as easily have chosen one
flyback that is adequate for a 21, and used it across the product line. 
22 Oct
22 Oct
1:09 a.m.
I've got a rebadged Sony GDM-20E20 and GDM-20D11
that have some issues and
Just FYI I have yet to get a repair estimate on any of the problem
Sun monitors I run across of that model type that don't more than
double the replacement cost of a working used unit. People I know
that deal in a lot of this model used don't seem to bother to repair
them either, and they are pretty darn cheap, and not without
resources.
OTOH I sure do like my 20E20, and haven't had a bit of trouble with it.
6:39 p.m.
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7:28 p.m.
On Tue, 22 Oct 2002, Tony Duell wrote:
OK, I can make it display a picture - if I press a button that displays
the OSD, it'll play the OSD with a properly sync'd image in the
background. However, the image very quicky (possibly somewhat random
timebase) fades in and out, as if the brightness was being adjusted at a
very fast rate. If I'm lucky, when I press a button to disable the OSD,
the monitor will get 'stuck' in a brightness level that makes the picture
visable. Simply trying to adjust the brightness and contrast with the
front-panel controls offers no solution.
I'll take a look at that once I get this E20 off of my workbench...
-- Pat
http://dilbert.com/comics/dilbert/archive/images/dilbert2040637020924.gif
seems to have
HV ok, but doesn't display any picture - but it appears to
OK, check all the CRT voltages -- almost certainly one is missing. It is
_very_ uncommon for the deflection system to fail in a way that forces
the beam off-screen. be powered up
ok. The D11 won't switch out of powersave mode.
Assuming it fully powers up when it detects a valid sync signal, I would
start by checking it's getting sync (no sillies, like a broken cable!),
then look at the sync input circuitry. Alas it could also be the
microcontroller (I assume it uses a microcontroller to control things
like this -- most modern monitors seem to) that is not responding the the
sync input signal.
23 Oct
23 Oct
6:21 p.m.
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