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EXP GDC HDMI-to-mPCIe wiring diagram
 

EXP GDC HDMI-to-mPCIe wiring diagram  

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nando4
(@nando4)
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Joined: 3 years ago
 

Courtesy of @wimpzilla  here.  It helps tremendously those users fixing or making their own EXP GDC cables like done here (HDMI to expresscard ).

HDMI Connector Pinout

Here you go!

BEWARE to asses correctly the pin number on the HDMI connector, you will notice that on the pic there is 2 lines with pin number.

The upper one is for the HDMI cable connector view, the line under is for the EXP GDC HDMI connector, since when you look at and pug it it invert the pin number.

eGPU Setup 1.35    •    eGPU Port Bandwidth Reference Table

15" Dell Precision 7510 (Q M1000M) (6th,4C,H) + GTX 1080 Ti @ 32Gbps-M2 (ADT-Link R43SG) + macOS 10.13.6 & Win10


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wimpzilla
(@wimpzilla)
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Joined: 3 years ago
 

Thank you a lot nando4, i forgot to open a new thread like you asked. ^^

  • Just to clarify, i mapped the cable using the continuity mode of a multi-meter, checking carefully each pin/trace on the mpci-e/HDMI connector.
  • I also checked with the impedance mode, to check if i missed some connection due to internal SMD component present, but not visible to me, not visible with the continuity mode.
  • I got the same result in both cases after checking carefully, you should also recheck, because i didn't opened the cable to look for inside!
    • BUT, i can't say for sure this is real pinout, so take it at your own risk.

 

Always happy to help out! ^^

2012 13-inch Dell Latitude E6320 + R9 [email protected] (EXP GDC 8.4) + Win10
E=Mc²


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Plastixx
(@plastixx)
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Joined: 3 years ago
 

Explains why the USB port on the BEAST doesn't do anything. Why did they even include it in the design?

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wimpzilla
(@wimpzilla)
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Joined: 3 years ago
 

Retro-engineering the GDC v8.4d give some nice info:

  • About the usb port:
    • There is a 3rd jumper on the EXP GDC pcb called slim line with 2 mode, default and ultra.
    • It seems the slim line switch control if the usb port is active, the pcb traces seems be routed to GND when ultra mode is ON, toward the HDMI connector when default.
    • I didn't found any USB DATA +/- pins when mapping the GDC connector, either i miss them either they route on existing pins already used.
    • I never tried the usb port, put the switch on ultra and never thought back about after.
    • It work maybe if there is no video adapter connected to the GDC, the only possible solution i saw to possibly get the USB work.

 

This together let me think, if i didn't find any pin for USB DATA +/-, it is greatly probable the usb didn't work or the usb is routed on pci-e by a new unknown dark technology! I think they included in the design in the previous build, maybe, on the next design v9.0, the usb port is replaced by the 2nd HDMI connector for the pci-e lanes 3/4.

I could only assume that what make atm the EXP GDC work well with the v2.0 link, it is the fact there is no interference from the cable, especially by the usb data! The EXP GDC cable is really sensible to EM noise, wireless, smartphones, home electric furniture, etc.

2012 13-inch Dell Latitude E6320 + R9 [email protected] (EXP GDC 8.4) + Win10
E=Mc²


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wimpzilla
(@wimpzilla)
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Joined: 3 years ago
 
  • To check if the EXP GDC v8.4d shielding was good enough, i added a second layer of aluminum to shield against EM noise, connected to the HDMI ground shroud. Here some pictures how to! Obviously this was quickly done, you can improve this with more layers, also sleeve a wire inside to get a proper ground shielding, cover with normal tape to isolate the external layer.
    • Take some double side tape and aluminum foil. Cut the desired length. Apply the foil on one side. Bend the edges and cut the excess.                                          
    • Get the tape stretched, turn it on the other side and stick the cable on it. You can decide how to do it better, more than one turn, etc. Time spent here: 5min.     
    • The job done quickly, but the result is not so bad. If you do it carefully with more turns it should end up nice and solid. But a bit less flexible!                        

 

  • I did not notice further ingame fps improvement with this additional shielding. Still the room is small and not so noisy EM side. Maybe this would help in others situations.

=>Meaning anyway that the cable itself is not so bad when providing v2.0 link specs, at least the basic ones!

=> I clearly noticed a big improvement were there is a lot of EMI, i.e when my washing machine is running. I did not notice any link/screen corruption this time, was odd since i thought about it far after when i was putting the cloth to dry! OP SUCCESS! ^^

(Beware when manipulating your cable, beware the aluminum foil conduct electricity, so check it doesn't short anything on the laptop)

2012 13-inch Dell Latitude E6320 + R9 [email protected] (EXP GDC 8.4) + Win10
E=Mc²


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ZodiusInfuser
(@zodiusinfuser)
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Joined: 3 years ago
 

I know this is an old thread, but I just wanted to say thank you to Wimpzilla for creating this diagram for the community! I was having issues with loose wiring within the mPCIe part of the cable (due to lots of repeated use) and thanks to this I was able to both fix the cable and shorten it by 15cm.

Also, regarding the USB. I think I have discovered why it never worked for mPCIe despite it working for people like my friend who uses ExpressCard for his eGPU setup. As you identified, the Data lines are not wired up to the mPCIe end, but that's not the whole story. It turns out that if you have the HDMI + Ethernet style cable like I do (or fashion your own cable), those lines do in fact exist, and go all the way to the adapter PCB, where they don't connect to anything..... What is interesting here is that on the PCB, in addition to the 9 connections needed for the eGPU there are two unsoldered contacts. Thinking these could be USB, I checked the continuity and it appears they are in fact connected to the SMBus pins of the mPCIe. Maybe this was an error on the part of the designers or they added them only to realise they were unneeded (in the same way as all the unpopulated components). In any case, as I made my cable shorter I had some excess on the 5 loose wires in the cable, so checked continuity and found that the Red wire inside the bundle with Ground, 3.3V etc is D- and the White wire in the neighbouring bundle is D+, so I carefully soldered them directly to the mPCIe contacts and it works!

So if anyone else fancies the "fun" of resoldering their own cable, remember that you can add the USB communication back if you want to. Note that there is glue under the heatshrink to hold the wires in place (but doesn't do a good job as I discovered), so you'll need to apply some heat to get it off easily. Also, I used Sugru to re-seal the cable but I'm sure other techniques will work. Here are some pictures:

After Heatshrink and Glue removal

OpenedmPCIeAdapter

Resoldered Topside (note the SMBus pins are not soldered to despite looking like wires go to them)

TopResolderedmPCIe

Resoldered Bottomside

BottomResolderedmPCIe

I hope others will find this useful 🙂

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datafrex
(@datafrex)
New Member
Joined: 2 years ago
 

please can you give us shéma cilcuit for mpci to hdmi wire and how we can to plugin it

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(@iaem_aleph_yanez_rosas)
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Joined: 1 year ago
 

ExpressCard to HDMI Final Diagram

expegc ec hdmi pinout

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LP4E
 LP4E
(@lp4e)
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Joined: 3 years ago
 

Hi guys, my mpcie cable is broken and I want to fix it but I can't find a wire color diagram for my exp gdc cable.. can you help me please?? 
This is my exp gdc cable:

Thanks in advance

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V37VOiYi
(@v37voiyi)
New Member
Joined: 12 months ago
 

I was Hoping someone would be able to help me make a new hdmi to m.2 nvme I see that they have the diagram for hdmi to pcie and hdmi to express card but what about Nvme m.2 to hdmi an since im using the v9.0 I would need to take both ends off of an hdmi and re-solder/wire them to the nvme m.2 slot any help please :(((

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Kuzavas222
(@kuzavas222)
New Member
Joined: 11 months ago
 

Hello!
I'm trying to fix my broken cable using this schematic, soldered, checked all pins with multimeter, but it does not seem to work. So I got a question:
Is there a difference between "beast" and "beast pro" cable wiring?
I bought "beast" on aliexpress, it said 8.4d version.. is it even original thing?
Mine looks like this (slimmer cable?)

Please, help 🙁
edit: 8.5c version on pcb!

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jevtabg
(@jevtabg)
New Member
Joined: 8 months ago
 

Buy on aliexpress just that cable, it is around 15$

Lenovo T430 i5,8GB,256GB ssd + 256GB msata
EXP GDC Beast V8.5c - GTX 770 4GB 256bit


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dwadi84
(@dwadi84)
Active Member
Joined: 2 months ago
 

Are cable between felame hdmi plug could be extended by some short hdmi to hdmi extension?

Laptop: Dell Precision M6600, i7, 32GB RAM, Quadro 4000m


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ERP C plus plus tech arch
(@erp-c-plus-plus-tech-arch)
Active Member
Joined: 1 year ago
 

Guys @iaem_aleph_yanez_rosas @nando4 @wimpzilla @zodiusinfuser @datafrex @kuzavas222 @lp4e , i got a EXP GDC 8. 4d with a mPCIe connector, recently my unstable dock stopped showing on the laptop which it earlier used to and the cable seemed bloated close to the mPCIe connector :

I opened the cable mPCIe only to find that out of the 5 cables out 14 are not attached to the actual mPCIE connector:

I want to test the connection does any body have the circuit/wiring diagram of the mPCIe connector similar to express card as mentioned by @iaem_aleph_yanez_rosas , since i got 5 cables on the connector not attached to anything and color code of the cables are different to the one shown by @zodiusinfuser .
My Queries 
1. Would the mPCIe connector be similar to express card circuit/wiring diagram or jumbled a bit since both of them got same number of pins 9,  if do  not get a mPCIe circuit/wiring diagram then i would perform continuity/ impedance test it out myself in order to figure out the circuit diagram of mPCIe connector by referencing to the expresscard circuit/wiring diagram provided by @iaem_aleph_yanez_rosas. Any tips are welcomed.
2. Are the cables of exp GDC 8.0, 8.4d and 8.5c compatible with each other?. 8.4d and 8.5c seem similar with "beast pro" logo. If some one has both can you please confirm if they can be used interchangeably?
3. Does every body have a small bump in their HDMI to mPCIe connector cable or mine got damaged somehow.
https://imgur.com/OWlQchE
4. I saw a new version of the EXP GDC 8.5c mPCIe came out, is it better than 8.4d version ?
Pictures attached:
1. Bloated 8.4d mPCIe Cable.
2. EXP gdc 8.4d mPCIe to HDMI cable opened for testing.
Using a EXP GDC 8.4d with mPCIe connector.

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ERP C plus plus tech arch
(@erp-c-plus-plus-tech-arch)
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Joined: 1 year ago
 


@iaem_aleph_yanez_rosas @nando4 @wimpzilla
@zodiusinfuser  @datafrex @kuzavas222 @lp4e
It seems there are 3 cables with a label "Beast Pro" all marked with a 3 different serial number.
2 cables  with serial number 31130AP72-170522 (similar to my 8.4d cable) and 31130AP62-12 have the "Beast Pro" label of the left of the "Beast Pro" logo as shown below:
31130AP72-170522 Cable

Picture: 31130AP62-12 cable

While the "Beast Pro" cable with "31130A_P69-170222" the serial number under the "Beast Pro" logo as shown below:
31130A_P69-170222 cable

 Serial number 31130AP72-170522, 31130AP62-12  and 31130A_P69-170222 can be 8.4d, 8.5c and 8.00, while i saw GDC EXP 8.4d and 8.5c sent mixed with 31130AP72-170522 and 31130AP62-12 in the customer review <here>.
What if they are not compatible with each other as in case with @zodiusinfuser  and my case with different color code after opening the wire. Even though they should be compatible with each other, since the mPCIe connector they are connected to is a standard. Any thought are welcome.

Funny thing is they are all part of the same ad for a spare GDC EXP cable:
Cable Connector Office Black Easy Apply EXP GDC Notebook V8.0 Expansion Device HDMI To Mini Pci E For External Video Card Dock
Seems to me all the "beast pro" cables with all the serial numbers are compatible with each other. Any input will be appreciated.

Exp GDC "Beast Pro" and "Beast" internal cable comparison.

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ERP C plus plus tech arch
(@erp-c-plus-plus-tech-arch)
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Joined: 1 year ago
 

@iaem_aleph_yanez_rosas @wimpzilla  @nando4  @zodiusinfuser  @datafrex @kuzavas222 @lp4e
Just now confirmed with the seller who claims that that serial numbers(31130AP72-170522 / 31130AP62-12 /31130A_P69-170222) on the "Beast Pro" cables are manufacturing batch numbers, so all "Beast Pro" cables with different serial numbers are compatible with each other.
Queries:
1. While i am still unsure about "Beast Pro" and "Beast" Compatibility.
2. Please confirm if any one has HDMI to mPCIe connector circuit diagram or should i refer the circuit diagram given   as a reference and trying to figure out the connection by myself since express card connector and mPCIe connector have the same number of pins coming from HDMI connector into the laptop. Please advice.

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