Installing an MC Cthulhu and Imp in an Xbox 360 SF4 SE stick

You can (carefully) cut into the main black rubber that holds all four USB wires (5 if you count SGND) in order to increase your access to those wires.

Another place you can troubleshoot is the bottom of the Cthulhu. Follow the trace from the Home solder point to the Cthulhu’s main chip/socket. See if the solder on the leg of the chip that corresponds to Home is touching another leg or something else it’s not supposed to. Also check the other legs of the chip, just in case.

The legs under the chip look clean - nothing new or out of the ordinary from when I first got it. And I found out I was missing a connection between the guide on the TE PCB and “Home” on my Cthulhu screw terminal - so I made that connection as well.

The problem now though, is that I can’t test the functionality of the buttons until I can get my PC to recognize it lol…Still the same issue - plug in, xbox ring is fully lit and stays lit, and nothing registers on the computer. I find this highly unusual since it recognized both modes last night.

hhhrrrmmm…:bluu:

Question, and excuse me if this has been asked already but with 41 pages… If I am cutting open an existing Ethernet cable, how can I tell which wires go in the appropriate soldering points on the MC Cthulhu?

Hey Bomberman, do you have any advice on “starting over”?

I’m being pressed for time and I think it would take longer for me to figure out the problem, as opposed to just taking everything apart and starting over. I don’t have much experience to be an efficient “troubleshooter” and would much rather prefer starting over.

You didn’t really provide enough info to see if starting over would be worth it. Tell us your problems, and take pictures of all the boards if you can (make everything really clear and show us which wire is going where). It could be just one cable, or a short somewhere - it’d be a shame for you to start over if it’d only take 5 minutes to fix.

Alright, here’s pretty much the summary of what happened. I’m using a pre-assembled Cthulhu (PS3 only) + imp on a 360 TE stick, and used the guide from the first page. After I finished the mod, my PC recognized both the 360/Cthulhu modes, and every button worked. Then when I went to test it on my PS3, it worked fine until the guide button would go off and on, almost like it was being put on rapid fire, and the PS3 shutdown menu would come up.

I thought this had something to do with the guide button connection, so I went to take a look. The connection between PCB and imp looked ok, although I had to resolder the point on the PCB, and I had forgotten to establish a connection between the guide screw terminal on the Cthulhu and the PCB, so I made that connection as well.

Then back to the PC to test, and in 360 mode, the entire Xbox home button would remain lit (all 4 corners), but my PC would not recognize it. When in Cthulhu mode (switch to RS), the 1P corner would light up and then turn off, and my PC wouldn’t recognize that either.

I don’t have a really good camera since I sold it, but I’ll try to get some pics off of my phone sometime (I’ll have to pick up a microSD card reader tomorrow).

all my connections are in. worked great…

but now if I shake the stick a bit… it randomly disconnects.

any tips?

my wires seem to be soldered properly… all the buttons work…

so its gotta be the USB connections?


I found the problem. My ground wire from the imp fell out of the cthulhu. =P

i gotta make sure these wires are in properly before screwing them in!

Probably, yes. Try to position it so the 4 USB wires don’t bump into each other.

? This

that is answered on the first page:

Wiring the RJ-45 jack

Hopefully your stick is functioning correctly in Xbox 360 and Playstation 3 modes and you are ready to add support for extra consoles. Cut off one end of your ethernet cable so that only 6 inches remain attached. Using an exacto knife, slice from the cut end all the way to the remaining RJ-45 plug. Chop off the rubber shielding so that it doesn’t interfere with the wires we need.

Now you must determine which wire goes to which pin on the connector. Using AcceptableRisk’s image, we’ll establish a numbering scheme.
The MC Cthulhu has 3 rows of solder points dedicated to adding extra cables; each row is labeled G, A, B, C, D, E, F, and V. You can connect your Cat5 cable wires to either the first or second row. I used the first row but the second would actually give you a little more room to work with, so use that instead.

Attach the ethernet cable’s wires like so:

Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8
G A B C D E F V

And plug the RJ-45 connector of the cable into the RJ-45 jack inside the stick.

Congratulations, your arcade stick is complete!

Yes, I read that. But I still do not understand how I am suppose to know what color wires go where. I guess I am asking for a little more claifiication. For example, pin 1 will go to ground right? I see where pin one is in the ethernet jack, but how do I “follow” it so I am sure I have the correct wire once I cut the cable when I am ready solder to the cthulhu board?

a quick google search gave me this:

http://computernetworking.suite101.com/article.cfm/rj45_plug_ethernet_computer_network_color_code

search string “ethernet cable color wire chart” - first link on google

Thanks for helping him, Spektrum. But don’t use that wire chart. The colors can vary.

I revised the ethernet cable portion of the guide. Please let me know if it’s more clear now.

You can also check AdditionalRisk’s thread if you need more info.

Need help

I’m trying to dual mod my Te stick but with only a cthlhu board and NO imp so I would have 2 usb cables(one for 360 and one for ps3) coming out of my stick instead of one. Can someone direct me to a walk through or tell me I’m crazy and dont know what I’m doing. Thank you so much

why not atleast get a DPDT switch? that will eliminate the need for two cables.

I have no idea why anyone would want two seperate USB cables. Are you concerned about the extra work of soldering to the imp/DPDT switch? Because if you want to go your route, you’re going to have to strip and solder a brand new USB cable for the other PCB, and find a way to fit it through the existing notch for the existing USB cable. That’s much more work than assembling/mounting/soldering to the imp - and you don’t even have to assemble them anymore haha.

If you still really want to do it without the imp/DPDT switch, reply and I can give you a general guideline of how to do it. It’s really just more work, though - you’d almost be following the same steps that you would if you went the imp/DPDT route, except for it’d be more complex. With more steps.

tl;dr - do it with an imp - it’s worth the $15

I know this is probably a lost cause, but does anyone know if there’s a place you can still get the bare-bones (i.e. unassembled) MC cthulhu kits? Since only the assembled ones are being produced now, the price is almost doubled. I didn’t mind doing the extra work of assembling it myself (plus I dont’ need the screw terminals/usb jack), so I really used to like that more affordable option.

if anyone knows some place that has some old stock of these left over, I might just buy a bunch of them for future projects…

still need help

I would rather do it with the imp but I dont have the time to wait for the piece to come through the mail. I have to have my stick ps3 ready by Saturday morning. So can you please walk me through it. I think I did everything right, I have all the buttons and directions hooked to the cthlhu and a button for the playstation home button. I dont know if I’m suppose to do something with the ground points on the board. when I test it on the pc it recognizes it but it wont let me hit any directions or buttons

I’m assuming you have the original 360 USB cable hooked up to the Cthulhu? You connected all four points, right? (Ground, D+,D-, 5v)

usb cables

no i bought a 2nd usb cable to go into the cthlhu pcb. what do i do with teh ground points?? I think thats what im missing :sweat: