SNES Jr. Installation Guide

Basic Installation:

The basic installation procedure for the SNES Jr. offers the core features that most users will want from their SNES RGB Bypass + Dejitter mod on the SNES  Jr. These main features include:

– RGB Bypass. This part of the mod adds RGB output to the SNES Jr.

– Csync Restore. This part of the mod adds Csync output to the SNES Jr.

– S-Video Restore. This part of the mod adds S-Video output back to the SNES Jr.

– Csync Dejitter. This part of the mod adds the dejitter functionality to the SNES Jr. Csync output.

Installation Overview Image:

The areas of interest are numbered and color coded.

– Red is area 1

– Yellow is area 2

– Blue is area 3

Basic Installation Procedure:

Step 1: Remove the four gamebit screws from the SNES Jr. shell. You need to use a 4.5mm gamebit screwdriver for this.

Step 2: Remove all 7 Phillips head screws from the motherboard and remove the motherboard from the shell.

Step 3: Locate and trim the legs of the capacitors and the 7805 regulator on the back side of the SNES Jr. motherboard near the AV Multi Out port.

Step 4: Place the SNES RGB Bypass + Dejitter mod onto the pins of the AV Multi Out as shown in the photo below.

Step 5: Remove C3 and the crystal (X1) from the motherboard. There are a few ways to do this depending on what soldering equipment you have available. The way I do it is to use a large soldering iron tip and add plenty of extra solder to both legs of the X1 crystal keeping the solder molten across both legs. Usually the X1 crystal will fall off of the motherboard under it’s own weight if you can keep both legs hot enough. If you do not have a large enough soldering tip, you could remove the solder from the legs of X1 using a solder sucker, desoldering gun, or desoldering braid. Do whatever you are comfortable with.

Step 6: Solder your Csync R,G, and B wires to the vias indecated below.


Step 7: Solder you Csync, R, G, and B wires to the corresponding pads on the RGB Bypass + Dejitter Board.

Step 8: Solder a wire to MCLK_O. It is recommended that you use shielded cable for this, but it is not absolutely required. If you use shielded cable you need to solder the shielding to the GND pad right next to the MCLK_O pad. If you don’t use shielded cable you only need to solder a wire to the MCLK_O pad, and the GND pad is not used.

Step 9: Solder your MCLK_O wire to the via indicated in the image below. If you are using shielded cable you can solder GND to the via to the left of where you soldered the MCLK_O wire.

Step 10: Solder wires to the Y and C pads on the RGB Bypass + Dejitter Board.

Step 11: Flip your SNES motherboard over and locate the S-RGB encoder chip above the cartridge slot. You should remove the heat sink from the 7805 voltage regulator so you have easier access to the S-RGB chip. Solder the Y wire to pin 16 and the C wire to the pin 12 of the S-RGB chip as indicated below.

Step 12: Reassemble your SNES and enjoy!

Advanced Installation.

Coming soon!