TJ1

I moved over the ROM and TSOP from the 1.2v motherboard to the 1.4v and have run into the same issue. Maybe I need to transfer over the GPU or CPU as well? The PCB layouts between 1.2/1.4v look the same. I'm thinking of getting a donor 1.4v motherboard with MCPX 3 (Korea) and trying the swap again... I think it has something to do with the MCPX itself...

Ok so I totally messed up this Xbox. It's so mint and it's a crystal edition. I modded it with a Smart XX mod chip and 400GB IDE Hard-Drive. I made it so I can easily unplug the mod chip and install the original Hard-Drive if I ever wanted to bring it back to original. Everything was working well. All I was doing was finishing it up. I'm upset because I cannot get it to work again and I am hoping someone here can help. Long story short, I had the Xbox open and the Hard-Drive was removed, I was going to re-install the Hard-Drive after copying a bunch of DATA to it and then it happened, I dropped the end of the IDE cable onto the power supply and seen a small puff of smoke. Yes, I had the power plugged in......big mistake.....rookie mistake..... I really don't want to "replace" the motherboard with another one. That's the lazy way and it won't be "original".... so please help if you have the knowledge and experience replacing major components on original Xbox motherboards. The voltage from the power supply spiked through one of the pins on the IDE cable. I know which one if it helps.... Ended up Killing the Phillips DVD drive and the main Xbox motherboard. Took apart the DVD drive. I figured, I'll take the lazy way and replace the mainboard in the DVD drive and call that a day. Maybe fix the original one later. Now I still have the dead motherboard. I found one of the pins from the IDE port leading to the MCPX 3 South Bridge (Korea) was shorted. I don't have any schematics for this unfortunately, maybe someone could help with those. The line that is shorted I have removed the components causing the short. I removed RP6T1 and the MCPX 3 South Bridge. I have a 1.2v A38727-012 motherboard I am using for parts. I moved the RP6T1 and the MCPX 3 South Bridge (Taiwan) over to the "dead motherboard". Now the Xbox turns on and boots but will not complete. I am stomped with error 13 with the mod chip/400gb HDD setup. With the Hard-Drive un-plugged it gets error 07. Boots into my Smart XX bios. But that's it. Won't boot from a HeXEn DVD either.... With mod chip unplugged and with the original Hard-Drive, it gets the same error 13. Basically I know it's not an issue with the Hard-Drive's, or mod chip. I tested the mod chip and Hard-Drive in another Xbox 1.4v. I also checked all my solder work. The MCPX 3 worked fine on the parts motherboard... I tried a different DVD drive, DVD power cable, IDE cable, Xbox PSU. The motherboard still has an issue. I just don't know if there is anything special I have to do after swapping a MCPX 3. I know in newer motherboard of PC, that when changing a south bridge that the ME region has to be cleaned. I just don't have a lot of experience with PC's older than 2008. Is the MCPX 3 from the 1.2v not compatible on the 1.4v? I am pretty sure they are both the same part.. Only difference is where they were manufactured.