How to install your NES 2 A/V mod

A helpful, step-by-step guide with lovingly hand drawn illustrations and detailed photographs by your friend Triton. Now If you’re viewing this article, you’ve read the back of the business card that you received when you purchased the NES A/V mod kit from us, or followed along in the NES AV Mod Part I: Building guide and made your own. Ready to continue your journey to better video output quality on your Toploader NES?

For this mod you will need:
-soldering iron
-desoldering braid/bulb/pump
-Nintendo Gamebit for the security screws
(OR a flathead screwdriver you can ruin)
-Xacto knife
-some wire (but not HBO’s The Wire)
-Dremel tool or something similar to cut aluminum

Optional: NPN transistor, 2SC1317, 2N4401 or similar.
If used skip step 2-3
Man Blades Nerves of Steel


World 1-1: Grab your gamebit screwdriver and remove the 4 “Nintendo” security screws (of death). They are in each of the four corners, as shown on the picture. Simple as that! However, if you’re a normal human being that doesn’t have one of those handy, you have these two options (other than buying one on eBay but that’s no fun).

OPTION 1: The Pen Trick

Take a bic pen, remove the ink cartridge section (make sure not to separate the tip of the pen from the ink cartridge barrel, resulting in a huge mess), heat the end up with a lighter until it becomes soft, smush it down straight on top of one of the screws firmly, and hold it there for a few seconds until it cools. This will create a bond around the head of the screw that you can use to twist them loose, but be gentle with it as the plastic bond of the pen will wear out pretty easily. You will probably have to re-melt the plastic for each screw.

OPTION 2: The Screwdriver Trick (ADVANCED)

Note: DANGEROUS. This will create sparks and sharp debris so exercise caution and use all safety precautions of power tools and the like with this method. It’s actually pretty Dangerous! If you are novice with a rotary tool and/or power tools in general use Option 1 (or just buy the specialty screwdriver, which is less than the cost of getting all your fingers sewed back on). If you have a spare flathead screwdriver sitting around and is narrow enough to fit into the recessed screw holes on the back case yet still wider than the Nintendo screws themselves, we can cut out the middle of the head with a dremel tool so that the screwdriver will grip the sides of the screw to remove it. Take the screwdriver and CAREFULLY dremel out the middle of the blade a small bit at a time until you can fit the two prongs that have developed into the notches on the Nintendo screw. For more information on this method take a look at Ben Heckendorn’s Engadget Article on different methods of removing Nintendo screws.

World 1-2: Now that you have the case open, it’s time to remove the large aluminum heat sink that is behind the cart slot. Look at the back of the case and locate the 7805 Voltage regulator and remove the screw that attaches the voltage regulator to the middle of the heat sink and set it to one side. Next, flip the board over and remove the 2 screws attaching the heat sink on the underside of the board. Remove the metal RF shielding on the front of the board as well. No further disassembly should be needed beyond this. NOTE: Handle your Nintendo with care while the motherboard is exposed, and be careful of static electricity!


World 2-1:
First let’s add in the hole for the A/V jack and mount it in place. Careful use of a Dremel Routing Bit or a ~3mm or 1/8th (0.125) inch drill bit will be required for this part.

1. Set the A/V jack in position next to the RF block with the threaded portion touching the grey plastic panel that the AC and RF jacks are located.

2. With a fine tipped marker, try to find and line up the exact location of the center of the opening for where you will place the A/V jack, keeping it (in line) with the placement of the other existing parts on the panel to keep a streamlined look. A good way to achieve this is to take a pencil, look at the AV jack sitting in place straight on from the side (as close to perfectly straight as you can) and make a mark where the center line is. Do the same from the top of the jack as well. The center mark will be where the lines intersect.

3. Now that you have your center mark, carefully drill the hole using the dremel/drill bit size mentioned above. The hole will be about 1mm smaller than the needed for a small amount of wiggle room to adjust your hole if it is slightly off center.

4. Make sure to drill/dremel slowly, as it’s better to have a hole too small than too big. Dremeling to about 80-90% of finished size then carefully carving it out the rest of the way with an X-acto knife is an alternative if worried about cutting off too much with the power tool.

5. When making the hole is complete, the jack should ideally fit snugly in the hole with the nut only being needed to prevent the jack from getting pushed back inside the NES. A dab of loctite or superglue to prevent the nut from coming off is also recommended.

STEP 3: Lifting Pin 21 on U5 CHIP

You can either cut the trace (as shown in the picture) that goes between the leg of transistor Q1 and pin 21 on u5. Alternatively you can use your x-acto knife and score the leg (carefully!) as close to the pcb as you can, cut a nice deep groove in the pin, and then work a loop of strong thin wire behind the pin so that it wraps around each side. After that, carefully use the wire to pull outwards on the pin. You may need to score it again, but with a little effort the pin should split where you scored it. Make sure to solder to the chip side, not the PCB side.

STEP 5: Desoldering U1 Transistor

If you have chosen to purchase your own NPN transistor to use on the mod board you can skip this step. follow standard de-soldering procedure appropriate for your particular device (desoldering pump, bulb, or braid)  practice on some junk first before going for the real thing if you feel that you need it. Try to keep the amount of heat as low as possible to prevent damage to U1.

STEP 6: Installation

1. Solder (ORANGE) wire to pin 20 of the big IC with U5 marked next to it.

2. Solder (BLUE) wire to pin 21, opposite pin 20 on U5

3. Solder (GREEN) wire to pin 40 of U6

4. Solder audio wire to pin pictured (on bottom of board)

5. The ground wire for the mod board goes between board and the RF shielding when board is installed. Make sure no other wires are touching the shielding after installation.

STEP 7: Power LED Mod

If you look inside the top shell of the NES around where the power switch is, you will notice a little dimple under it. Simply remove the power button, and use the same bit as above Drill a hole in the dimple. Next, install either the supplied LED and resistor, or a resistor and LED of your own. Secure with super glue, hot glue or whatever. The positive leg of the resistor goes to the output pin on the 7805.

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STEP 8: Testing & Reassembly

Check all your connections, making you you don;t have any bridged pins or loose connections. Also make sure the ground wire loop is contacting the RF shielding when you screw down the mod board. Simply plug the AV cable into the jack you installed on the back of the NES and plug the RED plug into the video (yellow) RCA jack on your TV. White connector can be plugged into either of the stereo (white/red) RCA jacks. You can also purchase a splitter and plug it into both for faux-stereo! Plug in the power, pop a game in and give it a shot. If you followed the directions properly you should be now ready to close up your Nintendo and enjoy!

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