Hello, if you are interested in performing an internal HDMI mod, I have provided a complete guide for the Original Xbox. I am using custom internal PCBs to mount the Electron Shepherd Analog 720p Converter/Output.
This is an intensive modification that requires you to desolder and remove the console’s original AV port to make space for the PCBs and converter. This guide will show you exactly what the process entails, as well as providing a complete visual on how it is done.
This guide is specifically for v1.0 through v1.5 Original Xbox models. The v1.6 model is covered in a separate guide that is also available on here.
Please note: Following this guide does not make me responsible for any damage, including bricking, destroying, or short-circuiting your console.