Yesterday I installed the OpenXenium modchip from one Xbox to another (both 1.6 revs). I had to disconnect the LPC rebuild PCB, which was kind of a nightmare, but it worked. After installing it, the Xbox booted with modchip connected. But didnt't start without it. Which I thought was weird. So I tried reflowing a couple of the connection with no luck, instead the Xbox wouldn't boot with or without the modchip connected.
I decided to remove the LPC rebuild PCB and restore the LPC by handwiring it. Now the Xbox does boot without the modchip connected to the LPC port, but with the modchip installed it doesn't. The green power LED turns on for approx 1 second. And on the OpenXenium a RED led.
I have already ordered a new LPC rebuild PCB. Hope anyone over here knows how to solve this. I already meassured al of the pins on the LPC port with a multimeter and all expected voltages are present. I have bridges the two pads on the OpenXenium which are neccesary for a 1.6 rev.