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From: Jstein on 12 Feb 2010 09:38
Hi Everyone,

I'm hoping you can help me with an issue I'm having with my NEC flat
panel monitor model LCD1935NXM. This monitor was purchased a few
years ago and I recently started having trouble with it. The screen
shows no picture when connected to my computer. If I turn it off and
on, I get a quick (1 second) picture then solid black screen. I have
tried setting this up with VGA and DVI cables to no avail. I also do
not believe this is a setting issue as I have tried the monitor on
several computers adjusting the display settings on all of them.

Does this monitor have a chance or is it destined for the landfill? I
paid a lot of money for this and I would be saddened to see it go.
Anyone have any idea what could be causing this ? Thank you in
advance for your help.
From: Ken on 12 Feb 2010 12:31
Jstein wrote:
> Hi Everyone,
>
> I'm hoping you can help me with an issue I'm having with my NEC flat
> panel monitor model LCD1935NXM. This monitor was purchased a few
> years ago and I recently started having trouble with it. The screen
> shows no picture when connected to my computer. If I turn it off and
> on, I get a quick (1 second) picture then solid black screen. I have
> tried setting this up with VGA and DVI cables to no avail. I also do
> not believe this is a setting issue as I have tried the monitor on
> several computers adjusting the display settings on all of them.
>
> Does this monitor have a chance or is it destined for the landfill? I
> paid a lot of money for this and I would be saddened to see it go.
> Anyone have any idea what could be causing this ? Thank you in
> advance for your help.

Does the power LED stay lit when the picture goes away? You could have
a power shut down if it flashes or goes out. Unless you have electronic
repair skills, it is unlikely that repairing it is worth the cost.

The only practical repairs I have seen are to the power supply. Filter
capacitors often show signs of failure by bulging, but some do not.
Other failures (particularly in the display) are often difficult to
diagnose and obtain parts in order to repair them.
From: D Yuniskis on 12 Feb 2010 12:44
Jstein wrote:
> Hi Everyone,
>
> I'm hoping you can help me with an issue I'm having with my NEC flat
> panel monitor model LCD1935NXM. This monitor was purchased a few
> years ago and I recently started having trouble with it. The screen
> shows no picture when connected to my computer. If I turn it off and
> on, I get a quick (1 second) picture then solid black screen. I have
> tried setting this up with VGA and DVI cables to no avail. I also do
> not believe this is a setting issue as I have tried the monitor on
> several computers adjusting the display settings on all of them.
>
> Does this monitor have a chance or is it destined for the landfill? I
> paid a lot of money for this and I would be saddened to see it go.
> Anyone have any idea what could be causing this ? Thank you in
> advance for your help.

(sigh) Would have been nice if you had done some research
(there's this website called *Google*...) before posting.

*Knowing* what *should* be on the screen, shine a flashlight
obliquely (so the reflection doesn't come straight back at
you) *into* the screen. If you can see the image that you
*expect* to be there, then your backlight(s) are not operating
(but the panel itself *is*).

Then, use Google to see why that might be the case and what
you can likely *do* about it (assuming you have the
necessary skillset).
From: Jstein on 15 Feb 2010 08:36
On Feb 12, 12:44 pm, D Yuniskis <not.going.to...(a)seen.com> wrote:
> Jstein wrote:
> > Hi Everyone,
>
> > I'm hoping you can help me with an issue I'm having with my NEC flat
> > panel monitor model LCD1935NXM.  This monitor was purchased a few
> > years ago and I recently started having trouble with it. The screen
> > shows no picture when connected to my computer. If I turn it off and
> > on, I get a quick (1 second) picture then solid black screen.  I have
> > tried setting this up with VGA and DVI cables to no avail.  I also do
> > not believe this is a setting issue as I have tried the monitor on
> > several computers adjusting the display settings on all of them.
>
> > Does this monitor have a chance or is it destined for the landfill?  I
> > paid a lot of money for this and I would be saddened to see it go.
> > Anyone have any idea what could be causing this ?  Thank you in
> > advance for your help.
>
> (sigh)  Would have been nice if you had done some research
> (there's this website called *Google*...) before posting.
>
> *Knowing* what *should* be on the screen, shine a flashlight
> obliquely (so the reflection doesn't come straight back at
> you) *into* the screen.  If you can see the image that you
> *expect* to be there, then your backlight(s) are not operating
> (but the panel itself *is*).
>
> Then, use Google to see why that might be the case and what
> you can likely *do* about it (assuming you have the
> necessary skillset).

I was able to shine a flashlight on the screen this weekend and their
is in fact a picture so it would appear this is a back lighting issue.
Because the screen turns on at full brightness for a split second,
would this imply that the back light has completely failed (and needs
to be replaced) or could there potentially be another issue affecting
this ie power supply, component failure etc?
From: who where on 15 Feb 2010 10:34
On Mon, 15 Feb 2010 05:36:14 -0800 (PST), Jstein
<stein.jesse(a)gmail.com> wrote:

>I was able to shine a flashlight on the screen this weekend and their
>is in fact a picture so it would appear this is a back lighting issue.
>Because the screen turns on at full brightness for a split second,
>would this imply that the back light has completely failed (and needs
>to be replaced) or could there potentially be another issue affecting
>this ie power supply, component failure etc?

The fact that the backlight powers up at full brightness and then
shuts down suggests pretty strongly that you have a controlled
shutdown by the inverter controller. Two likey causes are (a) a tube
failure causing imbalance and (b) some non-tube-related fault in the
inverter drive circuitry. My bet is on (b).
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