I held it down to plug into my 360 but nothing no Guide Light
It sounds like the fundamental concepts are getting lost to you. Anyone feel free to correct me since I’m not an electrical engineer but this is how I see it.
Every PCB needs power in order to operate and most PCBs have a way of sharing power. Now, your USB cord is going to be the source of your power since it plugs into your PC/360/PS3/whatever.
So I imagine this with a Cthulhu + Imp setup (I don’t have an imp so I don’t know for sure). I would run the red power line from the USB into the +5V contact on the Imp. I’d run a wire from the VCC to the MadCatz +5V contact and then I’d run another wire from the MadCatz VCC to the Cthulhu’s +5V. Don’t forget the ground on all of them too.
With this setup, you have no just transferred power from the console > imp > madcatz > cthulhu. There’s no reason to have a second line from the VCC unless you are powering something else, such as a Perfect360, LEDs, or a vibrator.
Double check your data lines, you may have damaged your PCB which I’m starting to think I have. Or if I’m missing a core concept, I may just need to hook up the Cthulhu before it’ll start working. I doubt it though… but I’d sure like to believe it.
Damn I followed this diagram exactly
I tested the data lines with a ohm meter…I know I am missing something because I double checked the soldering and the connections with a ohm meter
I read in a few posts back some ppl were having problems not powering up and it was recommend to use another line…Someone please clarify
Well I’m just trying to say that there is more than one right answer to how you approach this. If you understand the concept, you won’t need that diagram. The only thing you REALLY need is a pinout, which you have. Just stare at the diagrams for a while and try to understand why things are setup that way instead of blindly following it.
Anyways, I’m on the same boat as you with my second stick so I don’t think I’m a good source for information anyway 
How can I properly check to see if my PCB is damaged or not…?
Also the tight 2 rows of connections on the MC Cthulhu Board Labeled A-H and 1-9 (Not labeled on the Board)
I have no connections going into them
Here’s is my soldering job the toughest wire to solder to me was the usb cable to the Imp used the tinning method for most
If you can tell there is a couple strands that are loose from the red wire
http://i133.photobucket.com/albums/q53/RemzRR/SFIV%20TE_MC%20Cthulhu_Imp/360PCB.jpg
Checked the voltage on my multimeter on the Usb cable going onto the Imp Board
It didn’t register 5v more like 0.004 or something
I redid the solder connection+
Usb device has exceeded the power limits of the hub port error message came up when trying to test on another pc
Hey bomberman, just wanting to clarify something… i was wondering which VCC you are you refering to; the VCC point where the original USB was located in, or the the one in this pic?
Reason i ask is cos in Faux’s diagram, the 5V point that was used was the one from the original USB, there’s no reference in Faux’s diagram about using the VCC you have in the pic above, but looking at you other photo’s, you definitely have a wire on the VCC from the above location.
Also, with regards to the guide button, I can’t see in any of you pics, that you have two wires coming out of the guide button on the MC PCB, or the Cthulhu, once again, in Faux’s diagram, his got it shown that both guides are wired together to go to the guide on the IMP, do i have two wires soldered onto the MC PCB? (one going to the chtulhu and another to the imp?)
Sorry for the questions, i think i’m reading this too much, but i just wanted to confirm before i start soldering wires from the PCB 
You can use either the 5V point or the VCC point.
My picture doesn’t show 2 wires coming off of Home or Guide because I ran a wire from the alternate Guide point (on the Guide/Turbo PCB) instead of doing 2 wires from one spot. It’s generally a better idea to just do 2 wires from one spot, but I had to Guide/Turbo PCB out anyway so I decided to use that spot.
Remz, we’ll see what we can do… You soldering doesn’t look too bad but your wires are a mess, which is scary. I’ll PM you after I’ve thought it over.
sweet thanks!!!
I’ll follow faux’s diagram then like a hawk
let the modding begin!!
On that note, soldering isn’t anywhere near as hard as i thought… i flew through soldering the cthulhu and imp kits, and they look like pretty decent solder points if i do say so myself
Thanx Bomberman
Here are my resistance readings
redid the soldering on the Imp Board
so after 4 hours of cutting wire, tinning, soldering… i’ve now got a successful mod!!!
w0000t!!!
Thanks to bomberman for this awesome tutorial, faux for the diagram and of course, toodles for the wonder products known as mc cthulhu and imp!!!
Everything seems to be working fine, default is PS3, hold the home key and it starts up for 360, everything got a response on the PC, hopefully this won’t break down!!
Now one more to do 
I sooooo don’t wish this upon my worst enemy… its sooooo time consuming and strenuous (sp?)
I completely removed/desoldered all my wires that were soldered before
Thanks realized after some of your comments that my soldering job is ok but too much of the wires are exposed that could cause shorts
So I am only leaving a short amount of wire exposed and going back using the tinning method
will post pics when done
and going to the alternate points on the MC Cthulhu.
One question Letter C on the top two rows of the MC Cthulhu when looking at the top view
It states on the sheet that it is to Connect to the spot the blackwire from where the usb cable went.
can someone clarify since this doesn’t match up with the Faux diagram
wow this is impossible for me
RemzRR, i followed Faux’s diagram to the tee (except for teh start/back, where they were just switched around), and i was successful, maybe i was lucky, but it was my first soldering project, i think if you’ve followed the diagram (exact wires) and the solder joints are solid, then you shouldn’t have any problems
I followed the diagram to the Tee as well
I think it was a soldering job since I wasn’t getting the right voltage/resistance readings. And my wires were exposed everywhere.
The big mistake I made was not measuring the wires and thats why they are hanging all over the place and I now I am going thru the Alternative points on the top of the MC Cthulhu which have the tight two rows so I won’t be using the top and bottom rows like the Wiring Diagram since I don’t want to use screw terminals and it would look much nicer
Just wanted to know where Letter C or the top row third to the right goes if I am trying to get it similar to the Faux diagram…?
May the Gods Be merciful in your soldering my friend
Here is my revised wiring diagram using the top 2 rows on the MC Cthulhu
There is 20 points top and bottom on the original diagram versus only 17 points on the
two rows labeled A-H & 1-9 which would make 3 unused points on the option
http://i133.photobucket.com/albums/q53/RemzRR/SFIV%20TE_MC%20Cthulhu_Imp/RevisedWiringDiagram.png
I stopped during my soldering let me know if this is correct and where does the wire from the question mark goes if it is not right…?
Any help would be appreciated
I’ve asked you more than once not to clutter the thread. Bumping it because no one has answered you yet is cluttering the thread. Please be patient and respectful.