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S2716DGR, part number for LED backlight strip?
I have an S2716DGR monitor, a real beauty. But the LED strip has degenerated and yields uneven color across the screen.
Anybody know the part number for that strip? It runs along the bottom and is probably 25" long.
If there's a generic replacement, I'm OK with that, but of course the original would be best.
Thanks in advance for any pointers you can provide.
DELL-Chris M
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August 13th, 2022 05:00
The S2716DG/S2716DGR parts page does not list the LED backlight strip as a separate part. I also do not see a disassembly guide.
davodavo
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August 13th, 2022 12:00
Yikes. Well, I got a dead one of these monitors on eBay, I'll be using it to learn (1) how to take it apart and (2) the part number (if any) stamped on the backlight strip.
Kind of a drag that this part -- which is the most likely to fail over time -- isn't even listed in your docs.
davodavo
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August 18th, 2022 16:00
Got the dead monitor, took it apart--what a pain. Will post pictures and step-by-step when I have time.
Clearly the backlight strip would be available only as a sub-assembly, glued in place within the metal frame that holds all the monitor bits together. Looks like one of the following numbers is the part...any help, and can they be ordered from Dell or elsewhere??
DELL-Chris M
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August 19th, 2022 05:00
S2716DGR serial number CN-0P64CW-78312-5AM-02HQ A00
CN = China
0 = Filler
P64CW = Dell part number for entire monitor
78312 = OEM factory ID
5AM = Build date Year/Month/Day (2015/October/22)
02HQ = OEM manufacturer code
A00 = Revision
PC-GF10FR(65) 5Q0 = not in any Dell database
LGP-PMMA = not in any Dell database
AD587GM2EBZZ-ZZ1900 = not in any Dell database
R2597M100055AK0119740051600 = not in any Dell database
davodavo
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September 21st, 2022 13:00
OK, well I bought a parts-only monitor on eBay, took it apart to discover all the things I'd need to know when taking mine apart. Pictures to follow.
The first part of the disassembly you have to be really careful about, as the cabinet is a clam-shell that is held together with about 20 plastic clamps that go together really easily but are a pain to get apart. You will almost certainly break some of the small vents on the sides/top of the monitor in the process. Just think of it as improved ventillation.
Once you've got the back off, everything is pretty straightforward at first. But if you need to replace the LED strip, the only way to do that is to replace the entire metal plate that holds it AND you have to take all the display panel apart. There are stages where you have to be EXTREMELY careful, as there are literally hundreds of nearly microscopic connections between the LED and its long controller card. Go slow, be careful.
Re-assembly goes way faster, and as long as you're careful and thorough, it might take you 15 minutes to have it all together.
While I did succeed in replacing the LED strip -- I no longer had the discoloration in the right side of the screen -- something went wrong and it no longer showed a display. It talked properly to the HDMI port and the buttons, but no image appeared. I re-seated all connectors, but no improvement. I suspect something went wrong with the main graphics card.
The moral of this story: while it is possible to repair this unit, you'll have to be luckier than I was. Off to the eWaste it goes.
Photos inStart opening from the bottom next post
davodavo
9 Posts
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September 22nd, 2022 07:00
Various shots of getting the back of the casing off...
davodavo
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September 22nd, 2022 20:00
Well, turns out I can't edit my prior posts, but there is sort of GOOD NEWS and a lesson for all would-be service folks.
The news is that I decided to take the unit apart a third time and check the itty-bitty connectors to the LCD controller board (it's about 1.5 x 18" long, at the bottom of the monitor) and found that one of them had worked its way loose. Re-seating that connector brought it back to life.
Yay.
Then I looked at the image quality, and the discoloration that had been annoying me in the first place (about 80% of the screen was somewhat dimmer and had a brownish tinge) was still there. The white diffuser didn't have any irregularities, neither did the polarizer. So I guess the real issue was the LCD itself, as the LED strip was different. It's either that, or the used LED strip I put in there was just as bad as the one it replaced. Very odd -- I've never seen this kind of irregularity in an LED/LCD display before. It's not a pixel failure or anything -- it's a gradual diminution of the blue as you go up and to the right of the screen (the bottom 2" is perfect, but at the top it's a really noticeable color-temperature difference.
Life isn't simple. But off to eWaste it goes anyway.
davodavo
9 Posts
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September 23rd, 2022 14:00
Sorry, something went goofy above and I can't delete the duplicate photo. Due to the dupe, the captions are incorrect. I'll post more pix tomorrow (I'm limited by this forum to 10 per day).
davodavo
9 Posts
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September 23rd, 2022 14:00
bottom of equipment cage showing cables to LCD IF board. Nothing particularly magical about this tape (Gaffer's tape makes good replacement)Routing of LED and control-button cables on left of equipment cageOne of two connectors for the USB & audio daughter cardTwo main boards with all connectors, out of their cagePanel with all boards removedBottom of screen showing retaining bar and cablesRemove protective film VERY carefully, it's prone to tear. Will stick back when you are done.Underside of LCD IF board, showing four connectors. BE CAREFUL--lots of very fragile wires/connectorsLCD panel with IF boardRetaining bar with its protective film...you'll need to put it all back.
davodavo
9 Posts
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September 24th, 2022 08:00
This first one is the retaining bar&protective film:
I have some short videos, but you can get to them here.