M4800 Owner's Thread

@unnoticed

I have side question that been bothering me lately, I have both cables for LCD cover UHD and QHD, so without looking went trigger happy on bay, and purchased (compatible 4k innolux screen) it came to me swiftly (nothing to do with Taylor Swift), but appears that both Dell cables relating to higher resolutions have same width/size 40 pin smaller connector. yet innolux has 40 pin wider connector...now its easy to return the LCD, but my question is is there a way to make this work, or its a hassle? was there ever Dell UHD wider connector?

 

First thing I found searching for the model name is this image
https://www.ebay.co.uk/i/362497816219

In your wildest fantasy you could order a set with the bigger plug and bring out the microscope and convert the cable to the wider plug.
Replacing the socket? ...eh no. You would have to solder with microscope to do that and good luck aligning all the pins

My advice, return and buy another panel.





When it comes to 40 pin there is some more to read up on.
There is wider, narrow, 40 pin, 41 pin.

If you go to Specs tab and scroll down to Interface detail you can read:
Interface Detail, Model: I-PEX 20455-040E-76.

Referencing a dell part 71YHK:
https://www.parts-people.com/index.php?action=item&id=18796
This is a Sharp LQ156D1JW02
https://www.panelook.com/LQ156D1JW02_Sharp_15.6_LCM_parameter_24748.html

This screen is using the I-PEX 20525-040E-02 connector.
So this is the socket we need to be compatible with the wire loom plug.
If I click on the model name link I come to a list with all displays using this connector:
https://www.panelook.com/connector_modeldetail.php?id=320
And from here I can choose the panel with the correct size of course...duh..and a value that suits you, say the brightest panel?, best contrast ratio?, or the panel that excels in %srgb or adobe rgb etc.

Looking at this list..well there is not much to choose from, the original dell part has the same spec as the rest of them.

 

@unnoticed

much appreciated thank you for your input on this issue.

yes it seems seller IS selling "wildest fantasy" to others as well, listing it as DELL M4800 LCD!

listing is giving a sense of false hope, by making you think that you can fix it by buying another cable... well I got bamboozled into it have to admit.

again thanks.

 

On a related note, there were/are a bunch of the QHD+ M4800s up for auction on eBay this week.

I bought another (eDP) M4800 this week and I am awaiting its arrival. Unfortunately I seem to have missed the boat on the HP WX4150 MXM 3.0A cards that were selling the past couple of months or so. Irritating that I procrastinated too long!

Edit: I read back through the past few pages and I see there are recent buyers who are having difficulty with deciphering the screen options. As I refreshed my own memory on this subject this week, I'll post a short rundown on your options/method for discovering which variant a particular model is.

M4800 shipped with three display variants, meaning the physical style and mounting configuration of the display panel and lid assembly were all independent of each other and not interchangeable unless you swapped to the lid, hinges, and cable of the variant that you are aiming for. These are:
*LVDS; an older display communication technology that overlapped with the release of M4800
*eDP; the current display communication technology
*QHD+; specifically the 3200x1800 display that shipped on the highest spec M4800

The LVDS variant mounts an older style of panel that is absurdly thick by today's standards. The mounting points are in the corners of the lids and are meant to be used with brackets that screwed onto the display panel and will not align properly or at the right depth for a modern eDP panel. This type of panel is difficult to source now.
The eDP variant mounts a modern style of panel and can be interchanged with anything you like in the 15.6" form factor, with standard integrated mounting tabs inset along the top and bottom edges.
The QHD+ display panel is similar in construction to a standard eDP panel but the mounting tabs are not in the same locations, so the panel will only work with the lid specific to this variant.

If the listing you're interested in mentions QHD+ or 3200x1800, great, you know which variant it is and you're done. If not, you need the Dell Service Tag. Most of the time, the seller will take a picture of the bottom of the unit which if you're lucky will show a legible service tag. If not, the non-retarded sellers also include a photo of the BIOS with the service tag clearly listed. The sellers who deserve hugs also list the tag in the auction description.
Take this tag number over to dell.com/support and plug it into the appropriate field. You'll now see the Support page for that specific device. On the right is a link for View Product Specs. In this list, you're looking for the drop-down for the display that shipped with the model. For example, on my recent purchase it's listed as:
391-BBWL: 15.6 inch UltraSharp FHD(1920x 1080) Wide View Anti-Glare LED yadayada
and the drop-down information lists the associated part group numbers or however Dell refers to these things internally. Again, in this example:
4WVJT LCD,15.6FHD,IPS,EDP1.3,AG,AUO
XNHVP INFO,SWSI,LCD,15.6,NON-TCH
So by a little logical deduction, we can see it's a non-touch anti-glare 15.6" 1920x1080 IPS panel using eDP as the cable standard and made by AUO. If you google Dell's part group number, you'll see parts-people.com lists it as AUO's excellent B156HAN01.1 panel.

More often, it will be the LVDS variant of the screen in which case the drop-down will sometimes specify LVDS as a characteristic or sometimes not but will never list eDP while all the eDP part groups seem to mention it. Again, google the part group if in doubt and the associated parts-people.com page will list and have a photo of the specific panel. The LVDS panels are obvious because they have a shiny aluminum trim all around the panel while eDP panels are black with aluminum mounting tabs. Unfortunately both variants shipped with FHD and HD options so the resolution is not an identifying feature in this respect.

Edit 2: RANDOM MUSINGS ON BUYING A USED WORKSTATION AT THE PRESENT TIME

Obviously, prices are currently high thanks to the transdemic. I just paid roughly $150 more than I did two years ago for the same model and was fortunate at this price. I didn't want to pay $500-700+ for a Precision 7500-7700 series because that's getting too close to the low end of the new consumer gaming market which will outperform these workstations, thanks to greatly improved dGPUs and multicore CPUs. The 17-inch market is especially expensive which is a shame because the MXM B-type cards (exclusive to the 17" form factor, generally) have a good deal more upgradeability. I found the M6800 was ultimately not worth considering because their display options do not follow the same pattern as the M4800. I was not able to determine a simple method to find if a modern eDP panel could be swapped in and to what variant, nor which dGPUs would have compatibility with switchable graphics. The later Precisions are less ambiguous but also hundreds of dollars more expensive while Skylake CPUs paired with Maxwell GPUs have not aged particularly well. A $700 no-name gaming laptop with a Kaby Lake Refresh i5 and GTX 1050 (and newer hardware is quite attainable) is a far better value proposition.

 

I was referring to the LVDS_EDP_CABLE part, even though it has the WJ64D on it. Does someone have a M4800 with that cable installed in theirs?

 

timly post!

I need some clarity re cables as im assembling another unit soon.

noticed there are few cables around.
main dif would be;

1. LVDS vs EDP
2. 30pin (I guess can be both LVDS and EDP) vs answering my own question 30 pin can be 8bit not sure about LVDS 30 pin if such exist.
40pin (mostly LVDS and lower res sub FHD screens)? answering my own question all LVDS 40pins are esentially 6bit screens.

3. apendix QHD cable, hybrid? (would it work on EDP board without connecting appendix, instead of Pure EDP UHD cable?)

4. LVDS_EDP_FHD?, is it also hybrid conversion? (I have one on my EDP unit)
nevermind just tested and it does not work on LVDS machine so not sure why its written LVDS on cable that is clearly only EDP>

4. pure FHD or QHD EDP cable (no appendix) so downgrading is out of question due to lane usage?!

when I was looking for a cable, I saw two variants one was FHD - EDP cable, and another was FHD_LVDS_EDP marked cable... this is like UHD cable vs UHD cable with appendix?


and yet another silly question can we use 120hz panel in m4800 with upgraded gpu? or its a BIOS handicap?, and answering my own question (hopfully correctly) EDP 120 Hz LCD 30 pin (keeping in mind its same connecto type) should essentially work, because EDP is like if you would connect external display.

 

I do it works only on EDP board, but I have odd one

 

Ah ok, I was about to splurge on it so I may do that. I have an eDP only board too but the cable might be bust with the lid I got or busted one of the wiring in the cable that powers the backlight (hopefully its the cable at fault, not the board).

 

Does anyone have a boardview file for the LA-9771p board?

 

Here you go: (can't post the file here because of 2MB filesize limit)
https://anonfiles.com/hbi9R0ocu0/LA-9771P_7z


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