17" Viewsonic LCD monitor

V

vernond

Guest
I have a LCD monitor that powers up only when the VGA connector is not
plugged in.

If I plug in the VGA connector the display lasts only for about 20
seconds the most and then it goes dead. Even the power light will not
light up when this happens. The on/off button on the front also does
not have any effect.

I've replace the main filter capasitor and a 0.33uF capasitor in the
switching power supply but the problem is still there. The 5V from the
switching power supply that powers the display board is present all
the time(Even when the display is dead)

I've tried to leave the power on for about one hour and disconnect
the VGA connector which gives me a "No Signal" message for about 5
seconds and then the power light remains on. At this state the monitor
appears to be with any problem.

Thanks in advance.
 
On Mar 7, 10:29 am, vernond <vernondp...@yahoo.com> wrote:
I have a LCD monitor that powers up only when the VGA connector is not
plugged in.

If I plug in the VGA connector the display lasts only for about 20
seconds the most and then it goes dead. Even the power light will not
light up when this happens. The on/off button on the front also does
not have any effect.

I've replace the main filter capasitor and a 0.33uF capasitor in the
switching power supply but the problem is still there. The 5V from the
switching power supply that powers the display board is present all
the time(Even when the display is dead)

 I've tried to leave the power on for about one hour and disconnect
the VGA connector which gives me a "No Signal" message for about 5
seconds and then the power light remains on. At this state the monitor
appears to be with any problem.

Thanks in advance.
Click to expand...
For starters, how about a make and model and age information???
 
On Sun, 7 Mar 2010 08:29:30 -0800 (PST), vernond
<vernondpaul@yahoo.com> wrote:

I have a LCD monitor that powers up only when the VGA connector is not
plugged in.

If I plug in the VGA connector the display lasts only for about 20
seconds the most and then it goes dead. Even the power light will not
light up when this happens. The on/off button on the front also does
not have any effect.

I've replace the main filter capasitor and a 0.33uF capasitor in the
switching power supply but the problem is still there. The 5V from the
switching power supply that powers the display board is present all
the time(Even when the display is dead)

I've tried to leave the power on for about one hour and disconnect
the VGA connector which gives me a "No Signal" message for about 5
seconds and then the power light remains on. At this state the monitor
appears to be with any problem.

Thanks in advance.
Stop farting around replacing parts at random. There are three
Click to expand...
possibilities:

1. A bad regulator on the display board (there are probably three of
them). These are usually three terminal SMT devices. Identify them by
looking up the part numbers. Download the datasheets, and check the
output voltage.
2. Bad caps on the power supply allowing enough noise into the video
card to cause the onboard regulators to drop out of regulation.
Replace them all with good quality low ESR types like Panasonic FM or
FC series.
3. Bad caps on the display board. Again, replace with good quality
parts.

PlainBill
 
On Mar 7, 8:29 am, vernond <vernondp...@yahoo.com> wrote:
I have a LCD monitor that powers up only when the VGA connector is not
plugged in.

If I plug in the VGA connector the display lasts only for about 20
seconds the most and then it goes dead. Even the power light will not
light up when this happens. The on/off button on the front also does
not have any effect.

I've replace the main filter capasitor and a 0.33uF capasitor in the
switching power supply but the problem is still there. The 5V from the
switching power supply that powers the display board is present all
the time(Even when the display is dead)

 I've tried to leave the power on for about one hour and disconnect
the VGA connector which gives me a "No Signal" message for about 5
seconds and then the power light remains on. At this state the monitor
appears to be with any problem.

Thanks in advance.
Click to expand...
You sure the resolution you're sending it is in range? Shutdown might
be normal for wrong video rates.

G˛
 
On Mar 8, 2:10 am, "hr(bob) hofm...@att.net" <hrhofm...@att.net>
wrote:
On Mar 7, 10:29 am, vernond <vernondp...@yahoo.com> wrote:



I have a LCD monitor that powers up only when the VGA connector is not
plugged in.

If I plug in the VGA connector the display lasts only for about 20
seconds the most and then it goes dead. Even the power light will not
light up when this happens. The on/off button on the front also does
not have any effect.

I've replace the main filter capasitor and a 0.33uF capasitor in the
switching power supply but the problem is still there. The 5V from the
switching power supply that powers the display board is present all
the time(Even when the display is dead)

 I've tried to leave the power on for about one hour and disconnect
the VGA connector which gives me a "No Signal" message for about 5
seconds and then the power light remains on. At this state the monitor
appears to be with any problem.

Thanks in advance.

For starters, how about a make and model and age information???
Click to expand...
The model of the monitor is VA1716W. It's about 1 year old.

The main filter capacitor was out of tolerance, that's why I replaced
it.

A few capacitors in the video board was also replaced, but the results
were the same.

Will try to change the resolution and plugging it in again.
 
On Sun, 7 Mar 2010 15:49:46 -0800 (PST), stratus46@yahoo.com put
finger to keyboard and composed:

On Mar 7, 8:29 am, vernond <vernondp...@yahoo.com> wrote:
I have a LCD monitor that powers up only when the VGA connector is not
plugged in.

If I plug in the VGA connector the display lasts only for about 20
seconds the most and then it goes dead. Even the power light will not
light up when this happens. The on/off button on the front also does
not have any effect.

You sure the resolution you're sending it is in range? Shutdown might
be normal for wrong video rates.
Click to expand...
VA1716w User Guide:
http://www.viewsonic.com/assets/023/7430.pdf

"WARNING: Do not set the graphics card in your computer to exceed the
maximum refresh rate of 75Hz; doing so may result in permanent damage
to your LCD display."

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
On 15/03/2010 10:02 AM, Franc Zabkar wrote:
On Sun, 7 Mar 2010 15:49:46 -0800 (PST), stratus46@yahoo.com put
finger to keyboard and composed:

On Mar 7, 8:29 am, vernond<vernondp...@yahoo.com> wrote:
I have a LCD monitor that powers up only when the VGA connector is not
plugged in.

If I plug in the VGA connector the display lasts only for about 20
seconds the most and then it goes dead. Even the power light will not
light up when this happens. The on/off button on the front also does
not have any effect.

You sure the resolution you're sending it is in range? Shutdown might
be normal for wrong video rates.

VA1716w User Guide:
http://www.viewsonic.com/assets/023/7430.pdf

"WARNING: Do not set the graphics card in your computer to exceed the
maximum refresh rate of 75Hz; doing so may result in permanent damage
to your LCD display."

- Franc Zabkar
Click to expand...
Pretty rubbish design if it can actually be damaged.

Sylvia.
 
"WARNING: Do not set the graphics card in your computer
to exceed the maximum refresh rate of 75Hz; doing so may
result in permanent damage to your LCD display."

Pretty rubbish design if it can actually be damaged.
Click to expand...
Possibly this was carried over from a CRT manual by an ignorant writer.

It's not immediately obvious why this would damage an LCD display's drive
circuitry.
 
On Tue, 16 Mar 2010 04:29:27 -0700, "William Sommerwerck"
<grizzledgeezer@comcast.net>wrote:

"WARNING: Do not set the graphics card in your computer
to exceed the maximum refresh rate of 75Hz; doing so may
result in permanent damage to your LCD display."

Pretty rubbish design if it can actually be damaged.

Possibly this was carried over from a CRT manual by an ignorant writer.

It's not immediately obvious why this would damage an LCD display's drive
circuitry.
Click to expand...
My extensive experience tells me the LCD monitor won't function out of
its specified resolution and sync. Mine will just say "out of range"
 
My extensive experience tells me the LCD monitor won't function
out of its specified resolution and sync. Mine will just say "out of
range"
Click to expand...
True. But the issue is damage.
 
On Tue, 16 Mar 2010 08:30:20 -0700, "William Sommerwerck"
<grizzledgeezer@comcast.net>wrote:

My extensive experience tells me the LCD monitor won't function
out of its specified resolution and sync. Mine will just say "out of
range"

True. But the issue is damage.
Click to expand...
I'll set my Samsung 760 LCD up on my PC, adjust the sync for 100hz
and leave it cook for a few hours then get back with you.

Seriously, my interpretation is if the monitor input is out of range
the drive falls back to a error state and displays the out of range
message. In this state there will be no damage. Keep in mind that
this applies to a specific monitor so your mileage may vary with
others.
 
On Tue, 16 Mar 2010 18:30:01 +1100, Sylvia Else
<sylvia@not.at.this.address> put finger to keyboard and composed:

On 15/03/2010 10:02 AM, Franc Zabkar wrote:

VA1716w User Guide:
http://www.viewsonic.com/assets/023/7430.pdf

"WARNING: Do not set the graphics card in your computer to exceed the
maximum refresh rate of 75Hz; doing so may result in permanent damage
to your LCD display."

Pretty rubbish design if it can actually be damaged.
Click to expand...
I didn't believe it, either.

My AOC LCD just goes blank when the frequency is outside its limits.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top