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.
Mod Pinout

Solder Map
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
Coming soon.
Sega Master System 2 - PAL / IC BD M4 Jr PAL 2M / 171-6395A
Coming soon.