Success
.
It was bloody D4 line.
Here's what I did.
In the search of the short, I butchered the shifter board, by taking out the socket pin 7 and making a bigger hole on the board thinking that the short was somewhere there, but it was not.
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It did separate the cable header from the socket pin and header that goes into motherboard, but there was still continuity between pin 5 on the cable header and the ground. Next, I created a small link from the socket to the header that I soldered in place while adding piece of electric tape in between.
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I also pulled pin 7 of the header that goes into motherboard little be lower so that it is not touching the bottom layer just in case. Since there was still a short somewhere that was shorting the pin 5 on the header that is connecting to the MMU to the ground, I lifted the pin 5 a little bit so that it doesn't have any connection anymore and connected the 5th line of the cable with a small patch cable directly to soldered link from the socket to the pin header.
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I made sure that the patch cable is not creating any shorts and there is only connection from pin 5 of the cable header to the pin 7 of the socket with no ground anywhere, and turned on the machine and ...
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It also works on C103175.
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Also thought I might share how I fitted this RAM upgrade into C103175 by I creating a small "adapter" for it in case someone else wants to try it. The RAM Upgrade MMU board did not originally fit as 3 pin headers are too far apart for this socket. This board originally had MMU that was surface mounted, so I removed it with the hot air and cleaned the pads on the motherboard.
I had some trouble finding a socket that fit the bill, but eventually I soldered the 68 pin socket that I found on Amazon.
https://smile.amazon.com/gp/product/B08 ... UTF8&psc=1
Note that I tried other sockets that I got from Mouser (8468-21B1-RK-TR, 940-44-068-17-400000, 540-44-068-17-400000) and they would all fit the motherboard fine, but I just couldn't insert pins on the top in any of them. The only ones that you could insert pins into were the ones I got from Amazon.
As I said the MMU board did not fit onto this kind of socket that is surface mounted, so I took one of the sockets from Amazon (5 came with the order), and broke the 4 sides into individual pieces. I bent the pins on the bottom that are normally soldered onto motherboard, backward. Next, I inserted long side of the header pins (GRPB501VWVN-RC) from the bottom, creating an extension and soldered the header pins to the pins on the socket.
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I created 3 of those for the three sides required for the MMU board. I suggest adding enough of solder so that the pins are flexible and bendable but do not deattach from each other and are not creating a short. Next insert on each side required by the MMU board into the socket on the motherboard and then insert the MMU chip into the socket.
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Finally attach MMU board from the RAM upgrade into each of the sides. My profile was pretty low, but it was still touching the shielding. So shielding will either have to be cut or removed. It might look clumsy or weird but it works.
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Exxos maybe in the future if there is demand you can modify the placement of the pins on the MMU board so that it fits this type of socket without adapters.
Either way, Exxos thank you very much to you and RJ for helping me troubleshoot and fixing the issue with my board.
Stay safe in these trouble times.
