Dell P2715Q LED monitor Repair...

A

amdx

Guest
I have a Dell P2715Q that has the lower left 1/4 of the picture a little
grey and it blinks from normal to a little grey.

 But, today it got a little worse, now from the bottom up, 2/3 of the
screen is grey and a little darker grey in that lower left 1/4 of the
screen.

Note, you can still see what is there is is just over laid with the grey.

I don\'t know if this is a repairable problem or if it is a known
problem, but if it is something repairable, Capacitor, connections,

or whatever, I would like to fix it. But I need a starting point.

Here is a picture of the problem.

> https://www.dropbox.com/s/axwxzmr35vh2i20/Monitor.jpg?dl=0

                                 Thanks Mikek


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As I understand these devices, there is an LED array that provides the lighting. Several may have failed. I would bet that there is a YouTube out there somewhere on the replacement process.

Peter WIeck
Melrose Park, PA
 
On 3/20/2022 6:38 AM, Peter W. wrote:
As I understand these devices, there is an LED array that provides the lighting. Several may have failed. I would bet that there is a YouTube out there somewhere on the replacement process.

Peter WIeck
Melrose Park, PA
Click to expand...

I also thought it was probably a backlight problem. I mentioned it to my
son and he said It\'s an LED display, I don\'t think t has backlights.

 I think he is right.

                       Thanks,  Mikek


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On Sun, 20 Mar 2022 06:54:53 -0500, amdx <amdx@knology.net> wrote:

>It\'s an LED display, I don\'t think t has backlights.

Unfortunately, the established terminology is illogical.

An LCD monitor that uses CCFL for backlight is called an LCD monitor.

An LCD monitor that uses LEDs for backlight is called an LED monitor.

A monitor where each pixel is an LED, is called an OLED monitor.

A quick look at the specs for your monitor:

https://www.dell.com/ae/business/p/dell-p2715q-monitor/pd#TechSpec

...reveals that it is an IPS LCD monitor with LED backlight poistioned
around the edge (\"LED edgelight system\").

I am guessing that the LEDs are connected in a few chains of several
LEDs in series. If one LED fails open, the rest of the chain will also
go out.
 
On 20/03/2022 11:54, amdx wrote:
On 3/20/2022 6:38 AM, Peter W. wrote:
As I understand these devices, there is an LED array that provides the
lighting. Several  may have failed. I would bet that there is a
YouTube out there somewhere on the replacement process.

Peter WIeck
Melrose Park, PA

I also thought it was probably a backlight problem. I mentioned it to my
son and he said It\'s an LED display, I don\'t think t has backlights.

 I think he is right.
Click to expand...

It\'s a LED backlight. Go look at youTube.

--
Adrian C
 
On Sat, 19 Mar 2022 18:35:50 -0500, amdx <amdx@knology.net> wrote:

I have a Dell P2715Q that has the lower left 1/4 of the picture a little
grey and it blinks from normal to a little grey.

 But, today it got a little worse, now from the bottom up, 2/3 of the
screen is grey and a little darker grey in that lower left 1/4 of the
screen.

Note, you can still see what is there is is just over laid with the grey.

I don\'t know if this is a repairable problem or if it is a known
problem, but if it is something repairable, Capacitor, connections,

or whatever, I would like to fix it. But I need a starting point.

Here is a picture of the problem.

https://www.dropbox.com/s/axwxzmr35vh2i20/Monitor.jpg?dl=0

                                 Thanks Mikek
Click to expand...

It\'s an LED backlight.

Cracking it open is easier with fore-knowledge of the correct pressure
points, so as to allow reassembly, so check for manuals or google.

These things can have the same \'bad cap\' problems as a PC. I\'ve found
a few Acers that needed cap refurbs.

Replacing failing LED strips, however, is a potential pain.

On/off indicators fade with age, as well, so it\'s a good time to swap
them out, while the box is open.

RL
 
On Sun, 20 Mar 2022 06:54:53 -0500, amdx <amdx@knology.net> wrote:

I also thought it was probably a backlight problem. I mentioned it to my
son and he said It\'s an LED display, I don\'t think t has backlights.

 I think he is right.
Click to expand...

Some monitors use bright LED back lights. These days even some touch
lights use LED. So do some traffic lights. 60 years ago when I was a
teen I had a job with a UK semiconductor manufacturer testing black
high power diodes. Any that leaked light were rejected. Then a smart
woman doing the encapsulation suggested we sold them for lights. SFAIK
that was how LEDs started. Unfortunately no patent was given. We had
to wait for Nick Holonyak to do a proper job.

Steve

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SwingNN Prediction software http://www.swingnn.com
 
On 3/20/2022 8:01 AM, Adrian Caspersz wrote:
On 20/03/2022 11:54, amdx wrote:
On 3/20/2022 6:38 AM, Peter W. wrote:
As I understand these devices, there is an LED array that provides
the lighting. Several  may have failed. I would bet that there is a
YouTube out there somewhere on the replacement process.

Peter WIeck
Melrose Park, PA

I also thought it was probably a backlight problem. I mentioned it to
my son and he said It\'s an LED display, I don\'t think t has backlights.

  I think he is right.


It\'s a LED backlight. Go look at youTube.

Yep, I found it in the specs, \"*Backlight Technology:* LED edgelight system\"
Click to expand...

Recently had a storm, it killed my Modem power supply and my Dell
VS247-P. So of course I took it apart.

The fuse is good, the Full wave bridge and all other diodes are good, I
didn\'t lift the switching FETs to check them.

I did a complete disassembly, saved the PCBs for parts and saved the
screws.  Now I never saw any backlights so today,

I went out to the garbage can and retrieved the screen and tore it
apart. I can\'t see much, but there is a pattern all

around the edge of the screen that are probably LEDs. I have a
microscope, I will wait until later to get it.

It\'s in my son\'s room and he is sleeping. He\'s trying to adjust to
working 12 hour night shifts this week.

The screen is made of three layers, one a thin mylar type material, A
thicker darker opaque plastic and the LED screen.

 What is the liquid between the LED screen and the darker opaque
plastic? Just a thin layer a little oily.

                                            Mike


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On 3/20/2022 8:46 AM, legg wrote:
On Sat, 19 Mar 2022 18:35:50 -0500, amdx <amdx@knology.net> wrote:

I have a Dell P2715Q that has the lower left 1/4 of the picture a little
grey and it blinks from normal to a little grey.

 But, today it got a little worse, now from the bottom up, 2/3 of the
screen is grey and a little darker grey in that lower left 1/4 of the
screen.

Note, you can still see what is there is is just over laid with the grey.

I don\'t know if this is a repairable problem or if it is a known
problem, but if it is something repairable, Capacitor, connections,

or whatever, I would like to fix it. But I need a starting point.

Here is a picture of the problem.

https://www.dropbox.com/s/axwxzmr35vh2i20/Monitor.jpg?dl=0
                                 Thanks Mikek
It\'s an LED backlight.

Cracking it open is easier with fore-knowledge of the correct pressure
points, so as to allow reassembly, so check for manuals or google.
Yep, I\'m familiar wit snapping out the front bezel.

These things can have the same \'bad cap\' problems as a PC. I\'ve found
a few Acers that needed cap refurbs.

Replacing failing LED strips, however, is a potential pain.
Click to expand...

Yes, if the P2715Q is anything like the VS247-P then I think it\'s
impossible. Here is a picture of what I think

are the backlight LEDs mounted in the VS247-P LED screen it\'s self.

https://www.dropbox.com/s/0c2mvxymuhw73wn/Screen%20LED%20Backlights.jpg?dl=0
                                 Mikek
Click to expand...

On/off indicators fade with age, as well, so it\'s a good time to swap
them out, while the box is open.

RL
Click to expand...


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On 20/03/2022 15:39, amdx wrote:

Yes, if the P2715Q is anything like the VS247-P then I think it\'s
impossible. Here is a picture of what I think

are the backlight LEDs mounted in the VS247-P LED screen it\'s self.

https://www.dropbox.com/s/0c2mvxymuhw73wn/Screen%20LED%20Backlights.jpg?dl=0
Click to expand...

No, I don\'t think those are the LEDs.

How to replace a new edge backlight.
https://www.youtube.com/watch?v=Exqyy2JP8Nk


--
Adrian C
 
On 3/20/2022 10:16 AM, steve@justnn.com wrote:
On Sun, 20 Mar 2022 06:54:53 -0500, amdx <amdx@knology.net> wrote:

I also thought it was probably a backlight problem. I mentioned it to my
son and he said It\'s an LED display, I don\'t think t has backlights.

 I think he is right.
Some monitors use bright LED back lights. These days even some touch
lights use LED. So do some traffic lights. 60 years ago when I was a
teen I had a job with a UK semiconductor manufacturer testing black
high power diodes. Any that leaked light were rejected. Then a smart
woman doing the encapsulation suggested we sold them for lights. SFAIK
that was how LEDs started. Unfortunately no patent was given. We had
to wait for Nick Holonyak to do a proper job.

Steve
Click to expand...
I took I photo with my microscope, here is the  picture. After further
examination, I think the item on top

that I questioned as the Backlight is the LED.

https://www.dropbox.com/s/ns37uwg2l18x6zr/Microscope%20image%20of%20Screen.jpg?dl=0

 Again this is a screen from a Dell VS247-P.

                                                  Mikek


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On 3/20/2022 11:01 AM, Adrian Caspersz wrote:
On 20/03/2022 15:39, amdx wrote:

Yes, if the P2715Q is anything like the VS247-P then I think it\'s
impossible. Here is a picture of what I think

are the backlight LEDs mounted in the VS247-P LED screen it\'s self.

https://www.dropbox.com/s/0c2mvxymuhw73wn/Screen%20LED%20Backlights.jpg?dl=0


No, I don\'t think those are the LEDs.

How to replace a new edge backlight.
https://www.youtube.com/watch?v=Exqyy2JP8Nk
Click to expand...
I am familiar with that strip style backlight. The Dell VS247-P display
that I have shown does not have those in it.

I have not disassembled the Dell P2715Q monitor, But, I\'d wage a few
dollars on it having the same built into the screen led Backlighting.

I\'m sticking to that for now, but will change my mind when I learn
different. Review the thread I have posted a second picture through my
microscope.

Interestingly, they number the red, green and blue LCDs or are the LEDs.
Why would and LED need backlight?

Oh, the microscope link is still in my clipboard.

> https://www.dropbox.com/s/ns37uwg2l18x6zr/Microscope%20image%20of%20Screen.jpg?dl=0

                                               Mikek


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On Sun, 20 Mar 2022 16:01:53 +0000, Adrian Caspersz
<email@here.invalid> wrote:

On 20/03/2022 15:39, amdx wrote:

Yes, if the P2715Q is anything like the VS247-P then I think it\'s
impossible. Here is a picture of what I think

are the backlight LEDs mounted in the VS247-P LED screen it\'s self.

https://www.dropbox.com/s/0c2mvxymuhw73wn/Screen%20LED%20Backlights.jpg?dl=0


No, I don\'t think those are the LEDs.

How to replace a new edge backlight.
https://www.youtube.com/watch?v=Exqyy2JP8Nk
Click to expand...

Then you find out the new part doesn\'t work !!!!


Ken...W2BDP
Brighton,Colorado
 
On 3/20/2022 11:22 AM, amdx wrote:
On 3/20/2022 11:01 AM, Adrian Caspersz wrote:
On 20/03/2022 15:39, amdx wrote:

Yes, if the P2715Q is anything like the VS247-P then I think it\'s
impossible. Here is a picture of what I think

are the backlight LEDs mounted in the VS247-P LED screen it\'s self.

https://www.dropbox.com/s/0c2mvxymuhw73wn/Screen%20LED%20Backlights.jpg?dl=0


No, I don\'t think those are the LEDs.

How to replace a new edge backlight.
https://www.youtube.com/watch?v=Exqyy2JP8Nk


I am familiar with that strip style backlight. The Dell VS247-P
display that I have shown does not have those in it.

I have not disassembled the Dell P2715Q monitor, But, I\'d wage a few
dollars on it having the same built into the screen led Backlighting.

I\'m sticking to that for now, but will change my mind when I learn
different. Review the thread I have posted a second picture through my
microscope.

Interestingly, they number the red, green and blue LCDs or are the
LEDs. Why would and LED need backlight?

Oh, the microscope link is still in my clipboard.

https://www.dropbox.com/s/ns37uwg2l18x6zr/Microscope%20image%20of%20Screen.jpg?dl=0


                                               Mikek


  Found it in the specs, it is an LCD screen, which makes sense.
Click to expand...

                           Mikek


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On Sun, 20 Mar 2022 11:13:33 -0500, amdx <amdx@knology.net> wrote:

https://www.dropbox.com/s/ns37uwg2l18x6zr/Microscope%20image%20of%20Screen.jpg?dl=0
 Again this is a screen from a Dell VS247-P.
Click to expand...

Did you mean ASUS VS247H-P ?? I can\'t find anything with Google
called a Dell VS247-P:
<https://www.google.com/search?q=Dell+VS247-P>

The data sheet for the ASUS VS247H-P says the backlighting is W-LED
(white LED) and that it was first announced in 2012.
<https://www.asus.com/us/Commercial-Monitors/VS247HP/specifications/>
<https://www.displayspecifications.com/en/model/6b88f11>

Can you run the backlighting with the cover off? If so, check if the
dim lighting was caused by one segment of the backlighting array, or a
few dead LED\'s. I think (not sure) that there are multiple current
source drivers for each segment. One of them might be defective. If
you can find the driver connections to the backlighting, one segment
might show a lower driver voltage than the others.

Good luck.

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PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558
 
On Sun, 20 Mar 2022 10:54:39 -0700, Jeff Liebermann <jeffl@cruzio.com>
wrote:

On Sun, 20 Mar 2022 11:13:33 -0500, amdx <amdx@knology.net> wrote:

https://www.dropbox.com/s/ns37uwg2l18x6zr/Microscope%20image%20of%20Screen.jpg?dl=0
 Again this is a screen from a Dell VS247-P.

Did you mean ASUS VS247H-P ?? I can\'t find anything with Google
called a Dell VS247-P:
https://www.google.com/search?q=Dell+VS247-P
Click to expand...

Never mind. I didn\'t understand that the microscope photo was from a
different monitor.

--
Jeff Liebermann jeffl@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558
 
On 3/20/2022 12:54 PM, Jeff Liebermann wrote:
On Sun, 20 Mar 2022 11:13:33 -0500, amdx <amdx@knology.net> wrote:

https://www.dropbox.com/s/ns37uwg2l18x6zr/Microscope%20image%20of%20Screen.jpg?dl=0
 Again this is a screen from a Dell VS247-P.
Did you mean ASUS VS247H-P ?? I can\'t find anything with Google
called a Dell VS247-P:
https://www.google.com/search?q=Dell+VS247-P

The data sheet for the ASUS VS247H-P says the backlighting is W-LED
(white LED) and that it was first announced in 2012.
https://www.asus.com/us/Commercial-Monitors/VS247HP/specifications/
https://www.displayspecifications.com/en/model/6b88f11
Click to expand...

Yes, I\'m so very confused! It was an ASUS VS247H-P

Can you run the backlighting with the cover off?
Click to expand...

 No, this particular unit is not the one with the grey screen problem.
This ASUS died in an electrical storm on Friday night.

I opened it and checked Fuses, diodes and resistors in the power supply,
found nothing wrong, so I decided to \"/Learn by Destroying/\";-)

I tore all through the ASUSVS247H-P and found no strip LEDs on the edge
of the Screen. I still think they are built into the LCD screen edge.

Did you happen to look at the microscope picture I posted?

https://www.dropbox.com/s/ns37uwg2l18x6zr/Microscope%20image%20of%20Screen.jpg?dl=0
And a non magnified picture.
Click to expand...

https://www.dropbox.com/s/845ebgjx4cn5nd3/Sreen%20LED%20Backlights.jpg?dl=0

If so, check if the
dim lighting was caused by one segment of the backlighting array, or a
few dead LED\'s. I think (not sure) that there are multiple current
source drivers for each segment. One of them might be defective. If
you can find the driver connections to the backlighting, one segment
might show a lower driver voltage than the others.

Good luck.
Click to expand...

  The monitor having the grey section is a Dell P2715Q. If you have
info saying this unit does have

LED strip doing the edge lighting, then I may open it up and see if
there is any thing I can deal with.

Here\'s a short video with the problem almost at it\'s worse.

> https://www.dropbox.com/s/t8zdgea1ougool6/VID_20220320_133312657.mp4?dl=0

                                                 Mikek


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On Saturday, March 19, 2022 at 4:35:55 PM UTC-7, amd...@gmail.com wrote:
I have a Dell P2715Q that has the lower left 1/4 of the picture a little
grey and it blinks from normal to a little grey.

But, today it got a little worse, ...

Here is a picture of the problem.

https://www.dropbox.com/s/axwxzmr35vh2i20/Monitor.jpg?dl=0
Click to expand...

A backlight problem usually doesn\'t give a sharp line like the top/bottom gray-out
shows. Have you tried the monitor with a different video source (another video
card, or a TV output)? If there\'s a signal line with weak drive, or a power droop
during part of the page-refresh cycle, it could cause such an artifact.

When half the backlight of my TV went out, the effect was almost subtle, no
sharp line.
 
On 3/20/2022 3:04 PM, whit3rd wrote:
On Saturday, March 19, 2022 at 4:35:55 PM UTC-7, amd...@gmail.com wrote:
I have a Dell P2715Q that has the lower left 1/4 of the picture a little
grey and it blinks from normal to a little grey.

But, today it got a little worse, ...
Here is a picture of the problem.

https://www.dropbox.com/s/axwxzmr35vh2i20/Monitor.jpg?dl=0
A backlight problem usually doesn\'t give a sharp line like the top/bottom gray-out
shows. Have you tried the monitor with a different video source (another video
card, or a TV output)? If there\'s a signal line with weak drive, or a power droop
during part of the page-refresh cycle, it could cause such an artifact.

When half the backlight of my TV went out, the effect was almost subtle, no
sharp line.
Click to expand...

Yes, this is a dumpster dive monitor my son picked up at work. He tried
it on his computer when he first got it and it did this.

When my monitor died on Friday, we pulled it out for use, as it\'s better
than nothing.

Mikek


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On Sunday, March 20, 2022 at 1:16:00 PM UTC-7, amd...@gmail.com wrote:
On 3/20/2022 3:04 PM, whit3rd wrote:
On Saturday, March 19, 2022 at 4:35:55 PM UTC-7, amd...@gmail.com wrote:
I have a Dell P2715Q that has the lower left 1/4 of the picture a little
grey and it blinks from normal to a little grey.

But, today it got a little worse, ...
Here is a picture of the problem.

https://www.dropbox.com/s/axwxzmr35vh2i20/Monitor.jpg?dl=0
A backlight problem usually doesn\'t give a sharp line like the top/bottom gray-out
shows. Have you tried the monitor with a different video source (another video
card, or a TV output)? If there\'s a signal line with weak drive, or a power droop
during part of the page-refresh cycle, it could cause such an artifact.
Yes, this is a dumpster dive monitor my son picked up at work. He tried
it on his computer when he first got it and it did this.

When my monitor died on Friday, we pulled it out for use, as it\'s better
than nothing.
Click to expand...

It looks like a bad-data-transfer rather than a backlight problem, though:
can you try both VGA and digital inputs, to see if there\'s any difference?
Usually, the display has a flat flexible printed circuit cable, internally, it
would also be worth cleaning and reseating that connector.

If you can do it safely, poking parts and connectors with a stick while powered is
a useful diagnostic (even if the printed circuit board is cracked, that
can be fixable if you find the crack).
The intermittent symptom suggests bad connection somewhere.
 
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