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Dell P2715Q LED monitor Repair
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amdx
Mar 19, 2022, 7:35:55 PM3/19/22
to
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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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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This email has been checked for viruses by Avast antivirus software.
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Peter W.
Mar 20, 2022, 7:38:44 AM3/20/22
to
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
Peter WIeck
Melrose Park, PA
amdx
Mar 20, 2022, 7:54:59 AM3/20/22
to
son and he said It's an LED display, I don't think t has backlights.
I think he is right.
Thanks, Mikek
HW
Mar 20, 2022, 8:57:43 AM3/20/22
to
On Sun, 20 Mar 2022 06:54:53 -0500, amdx <am...@knology.net> wrote:
>It's an LED display, I don't think t has backlights.
Unfortunately, the established terminology is illogical.
>It's an LED display, I don't think t has backlights.
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.
Adrian Caspersz
Mar 20, 2022, 9:01:49 AM3/20/22
to
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.
> 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.
>
--
Adrian C
legg
Mar 20, 2022, 9:46:30 AM3/20/22
to
On Sat, 19 Mar 2022 18:35:50 -0500, amdx <am...@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.
>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
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
st...@justnn.com
Mar 20, 2022, 11:16:58 AM3/20/22
to
>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
>son and he said It's an LED display, I don't think t has backlights.
>
> I think he is right.
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
--
Neural Network Software http://www.npsnn.com
JustNN Just a neural network http://www.justnn.com
EasyNN-plus More than just a neural network http://www.easynn.com
SwingNN Prediction software http://www.swingnn.com
amdx
Mar 20, 2022, 11:23:56 AM3/20/22
to
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
amdx
Mar 20, 2022, 11:39:52 AM3/20/22
to
On 3/20/2022 8:46 AM, legg wrote:
> On Sat, 19 Mar 2022 18:35:50 -0500, amdx <am...@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.
> On Sat, 19 Mar 2022 18:35:50 -0500, amdx <am...@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.
>
> 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.
Yes, if the P2715Q is anything like the VS247-P then I think it's
> 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.
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
>
> On/off indicators fade with age, as well, so it's a good time to swap
> them out, while the box is open.
>
> RL
Adrian Caspersz
Mar 20, 2022, 12:01:59 PM3/20/22
to
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.
> 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
>>
How to replace a new edge backlight.
https://www.youtube.com/watch?v=Exqyy2JP8Nk
--
Adrian C
amdx
Mar 20, 2022, 12:13:38 PM3/20/22
to
On 3/20/2022 10:16 AM, st...@justnn.com wrote:
> On Sun, 20 Mar 2022 06:54:53 -0500, amdx <am...@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
>
I took I photo with my microscope, here is the picture. After further
> On Sun, 20 Mar 2022 06:54:53 -0500, amdx <am...@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
>
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.
amdx
Mar 20, 2022, 12:22:58 PM3/20/22
to
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
KenW
Mar 20, 2022, 12:24:16 PM3/20/22
to
Ken...W2BDP
Brighton,Colorado
amdx
Mar 20, 2022, 12:26:20 PM3/20/22
to
Jeff Liebermann
Mar 20, 2022, 1:54:47 PM3/20/22
to
On Sun, 20 Mar 2022 11:13:33 -0500, amdx <am...@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
>https://www.dropbox.com/s/ns37uwg2l18x6zr/Microscope%20image%20of%20Screen.jpg?dl=0
> Again this is a screen from a Dell VS247-P.
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.
--
Jeff Liebermann je...@cruzio.com
PO Box 272 http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann AE6KS 831-336-2558
Jeff Liebermann
Mar 20, 2022, 1:56:57 PM3/20/22
to
On Sun, 20 Mar 2022 10:54:39 -0700, Jeff Liebermann <je...@cruzio.com>
wrote:
>On Sun, 20 Mar 2022 11:13:33 -0500, amdx <am...@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>
Never mind. I didn't understand that the microscope photo was from a
different monitor.
wrote:
>On Sun, 20 Mar 2022 11:13:33 -0500, amdx <am...@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>
different monitor.
amdx
Mar 20, 2022, 2:40:18 PM3/20/22
to
On 3/20/2022 12:54 PM, Jeff Liebermann wrote:
> On Sun, 20 Mar 2022 11:13:33 -0500, amdx <am...@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>
Yes, I'm so very confused! It was an ASUS VS247H-P
> On Sun, 20 Mar 2022 11:13:33 -0500, amdx <am...@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>
>
> Can you run the backlighting with the cover off?
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.
> 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.
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
whit3rd
Mar 20, 2022, 4:04:42 PM3/20/22
to
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, ...
> 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.
>
> Here is a picture of the problem.
>
> > https://www.dropbox.com/s/axwxzmr35vh2i20/Monitor.jpg?dl=0
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.
amdx
Mar 20, 2022, 4:16:00 PM3/20/22
to
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.
whit3rd
Mar 20, 2022, 4:35:25 PM3/20/22
to
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.
> 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.
It looks like a bad-data-transfer rather than a backlight problem, though:
> 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.
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.
amdx
Mar 20, 2022, 5:54:14 PM3/20/22
to
try to watch a video bad monitor on the bad monitor?
You don't know what's on the video and what is the monitor. Here is the
latest symptom.
> https://www.dropbox.com/s/nxkg3qi9bohorbk/VID_20220320_164416143.mp4?dl=0
I'm ready to but a new monitor.
I had a 23.6" Asus, and the one I'm trying to us is a 27", I think
I'll go with the bigger one, 27".
I'm asking for input on a model. I don't play games I generally just
surf the internet, occasionally make a line drawing in Paint
and Save a lot of picture memes in paint. Just want something easy for
the tired old eyes.
HW
Mar 20, 2022, 6:19:50 PM3/20/22
to
On Sun, 20 Mar 2022 13:40:14 -0500, amdx <am...@knology.net> wrote:
>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
That does not look like a backlight problem. The transition between
>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
light and dark is perfectly sharp and horizontal. The backlight can't
do that.
amdx
Mar 20, 2022, 7:19:15 PM3/20/22
to
Best Buy same price as Amazon.
ohg...@gmail.com
Mar 21, 2022, 11:03:48 AM3/21/22
to
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