Famicom

The Nintendo Entertainment System (NES) HVC001 is a home video game console developed and marketed by Nintendo. It was released as the Family Computer (Famicom), in Japan on July 15, 1983, and as the NES in test markets in the United States on October 18, 1985, followed by a nationwide launch on September 27, 1986. The NES was distributed in Europe, Australia, and parts of Asia throughout the 1980s. It was Nintendo's first programmable home console, succeeding the Color TV-Game line of dedicated consoles, and primarily competed with Sega's Master System in the third generation of video game consoles.

To power the console, use a voltage of 9 VDC (HVC-002) , taking into account that the positive is the external part of the connector.

Modification for video connection via RCA

This is another version of pcb but you can use the same connection as in the photo above, in the yellow point (video) connect the wire (V) while in the red point (audio) the wire (A), while the ground (GND) where it is written GND above the PCB.

An audio problem may occur if the slider in the joystick is dirty, I recommend opening it and cleaning it.