This guide will show you how to install a switchless region mod into a Sega Master System model 2 which will allow the console to switch between 50Hz and 60Hz video output.
Sega Master System 2 – PAL / IC BD M4jr / 171-5922-A
Sega Master System 2 – PAL / French RGB / IC BD M4Jr. VA1 / 837-7275 / 171-5926-A
Sega Master System 2 – PAL / IC BD M4 Jr PAL 2M / 171-6395A
Step-by-Step Install Guide
Step-by-step guide for installing the Consoles Unleashed Sega Master System 2 switchless region mod with built in LED. Check the solder map section first and use that as the main guide. The step-by-step is using the PAL 171-6395A revision and some steps may not be relevant to other revisions.
Two trace cuts are required. Pause button trace cut and the video rate trace cut. The pause trace cut allows the mod kit to intercept the active pause signal and either output it back to the pause line to pause the system, or change the video rate. The video rate cut is required to remove a permanent connection to the video rate selector pin so it can be controlled by the mod kit.