NEC LCD1935NXM quick picture then black screen

J

Jstein

Guest
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.
 
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.
Click to expand...
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.
 
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.
Click to expand...
(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).
 
On Feb 12, 12:44 pm, D Yuniskis <not.going.to...@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).
Click to expand...
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?
 
On Mon, 15 Feb 2010 05:36:14 -0800 (PST), Jstein
<stein.jesse@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?
Click to expand...
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).
 
Jstein wrote:
On Feb 12, 12:44 pm, D Yuniskis <not.going.to...@seen.com> wrote:
Jstein wrote:
(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?
Click to expand...
Look for bad caps on the primary to the inverter.
 
On Feb 15, 12:49 pm, D Yuniskis <not.going.to...@seen.com> wrote:
Jstein wrote:
On Feb 12, 12:44 pm, D Yuniskis <not.going.to...@seen.com> wrote:
Jstein wrote:
(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?

Look for bad caps on the primary to the inverter.
Click to expand...
I was able to dive into this project the other night and did determine
that one of the surface mount fuses is open. I have uploaded an image
of the board here:

http://s443.photobucket.com/albums/qq154/steinj1/

The fuse that is open is labeled F2. The other surface mount fuse is
labeled F3 and appears to be fine. Can this fuse be replaced by an AGC
fuse ? Is it likely that this fuse failed on its own or there is
another underlying issue with the inverter board? My fear is that a
new fuse will fail immediately after the unit is powered up. Any
suggestions are greatly appreciated.
 
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