N64PWR-E Install Instructions

N64PWR-E Install Instructions


N64PWR-E Installation Guide

Overview

N64PWR-E replaces the original electronics inside the Nintendo 64 power supply with a modern USB-C Power Delivery solution while retaining the original power supply housing and console connector.

N64PWR-E provides regulated 3.3V and 12V output rails for the Nintendo 64 and is designed to install inside the original N64 power supply shell.

Soldering is required for installation.

Power Requirements

N64PWR-E requires a USB-C Power Delivery (PD) power adapter capable of supplying:

  • USB-C PD power source with 15V at 2A minimum

Higher-wattage USB-C PD adapters may be used as long as they support the required 15V profile.

Status LEDs

N64PWR-E uses onboard LEDs to assist with installation and troubleshooting.

Red Fault LED

When USB-C power is first connected, the red LED should briefly flash while the power source is negotiated.

  • Brief flash, then OFF: Successful negotiation.

  • Remains ON: The required power profile is not available. VBUS will remain disabled and should measure approximately 0V.

Two Green LEDs

The two green LEDs indicate proper operation of the 3.3V and 12V power converters.

  • Both green LEDs ON: Both power rails are operating.

  • One green LED OFF: The corresponding power rail is not operating correctly.

The green LEDs may optionally be disabled after installation by removing the 0Ω resistor labeled LED. Removing this resistor does not affect normal operation of N64PWR-E.

Before You Begin

Required Tools

  • 4.5 mm Gamebit driver

  • Soldering iron

  • Solder

  • Solder wick

  • Flux

  • Flush cutters

  • Multimeter


Included with N64PWR-E

  • USB-C PD module

  • Power conversion/delivery module

  • Two USB-C faceplates

  • 1 mm copper installation wire

Two faceplates are supplied because OEM Nintendo 64 power supply housings were produced with different-sized openings. Only one faceplate is required for installation.


Safety

The original Nintendo 64 power supply contains mains-voltage circuitry. Never open or work on the original power supply while it is connected to AC power.

Before opening the original power supply:

  1. Leave the power supply connected to the Nintendo 64.

  2. Unplug the power supply from the wall.

  3. Cycle the Nintendo 64 power switch several times to help discharge the capacitors in the original power supply.

  4. Disconnect the power supply from the console.

  5. Avoid touching components or exposed conductors on the original power supply PCB.

1. Test N64PWR-E Before Installation

Testing the USB board before assembly verifies that the USB-C PD section is operating correctly before any soldering or modification is performed.

  1. Connect N64PWR-E USB-C Module to a compatible 15V / 2A USB-C PD power source.

  2. Observe the red fault LED.

    • The LED should briefly flash during initial negotiation.

    • After successful negotiation, the red LED should turn OFF.

    • If the red LED remains illuminated, disconnect power and verify that your USB-C power source supports 15V at 2A.

  3. Using a multimeter, measure between VBUS and GND.

  4. Confirm approximately 15V is present.

Do not proceed until the PD module successfully negotiates and approximately 15V is present on VBUS.

2. Open the Original N64 Power Supply

The original power supply housing is used during N64PWR-E assembly to establish the correct position of the USB-C module.

  1. Make sure the original power supply has been disconnected and discharged as described in the Safety section.

  2. Remove the two 4.5 mm Gamebit screws from the power supply housing.

  3. Gently pull the two shell halves apart.

The halves are retained by internal molded lips. Some original power supplies may also have adhesive between the shell halves and may require slightly more effort to separate.

Do not force the housing apart or use excessive leverage.

  1. Once the housing is open, lift out the original power supply PCB.

The original PCB is not screwed into the housing; it is captured in position by the assembled shell.

Set the shell aside. It will be used shortly to align the N64PWR-E USB-C module.

3. Prepare the N64PWR-E Modules

N64PWR-E is supplied as two separate PCB modules:

  • USB-C PD module

  • Power conversion/delivery module

Inspect the two modules for any sharp edges or burrs and gently remove them with sand paper.

The printed outline on the power conversion board indicates the approximate position of the USB-C PD module during final assembly.

4. Prepare the Module Interconnects

The supplied 1 mm copper wire electrically connects the two modules while also supporting the USB-C PD module in its final position.

Three connections are required:

  • 1 × VBUS

  • 2 × GND

  1. Cut the supplied 1 mm copper wire into three suitable pieces.

  2. Insert the three pieces through the corresponding plated through-holes in the power conversion/delivery board.

  3. Solder the three wires to the power conversion/delivery board vertically.  Use Plenty of flux, these connections carry all the current so you want a solid connection.

  4. Leave sufficient wire extending upward to allow the USB-C PD module to slide onto the wires.

Do not solder the USB-C PD module to the wires yet.

5. Align and Solder the USB-C PD Module

The original power supply shell and supplied faceplate are used to establish the correct height of the USB-C module.

The USB-C PD module sits at approximately a 90-degree angle to the power conversion board and roughly 1/4 inch (6 mm) above it. Use the housing and faceplate to establish the final position rather than relying solely on this measurement.

A note about the faceplates, due to the manufacturing process and the thin walls, the USB-C port might fit very tightly and you may need to sand the slot to get the connector to fit.  

  1. Compare the two supplied faceplates with your original N64 power supply housing and select the faceplate that fits your shell.

  2. Slide the selected faceplate over the USB-C connector.

  3. Engage the locating tab on the faceplate with the corresponding hole in the PCB.

  4. Slide the USB-C PD module onto the three installed copper wires.

  5. Place the N64PWR-E assembly into the original power supply shell.

  6. Adjust the height of the USB-C PD module until:

    • The faceplate properly interfaces with the original shell.

    • The USB-C connector is centered and accessible.

    • The assembly sits naturally in the housing.

  7. Once the position is correct, solder each of the three copper wires to the USB-C PD module.

  8. Trim any excess wire length. 

The three connections provide both the electrical connection between the modules and the mechanical support that establishes the USB-C module's final position.

6. Test the Assembled N64PWR-E

Before transferring any components from the original power supply, verify that the assembled N64PWR-E operates correctly.

Check for Shorts

With USB-C power disconnected, use a multimeter to check for unintended continuity:

  • From each power rail to GND

  • Between the power rails

Do not apply power if a hard short is detected.

Note: Capacitors can sometimes cause a momentary continuity indication while charging from the multimeter. A sustained low-resistance connection is the concern.

Power Test

  1. Connect a compatible USB-C PD power source.

  2. Confirm that the red fault LED briefly flashes and then turns off.

  3. Confirm that both green LEDs illuminate.

  4. Measure the output rails with a multimeter.

  5. Verify approximately:

    • 3.3V

    • 12V

Do not proceed until both output rails are operating correctly.

7. Remove the Original Console Connector

N64PWR-E reuses the original Nintendo 64 console-side power connector assembly.

OEM power supplies may use either a 5-contact or 6-contact connector assembly. N64PWR-E supports both versions.

The wire loop attached to the OEM connector assembly must remain with the connector. It will be reused with N64PWR-E.

  1. Locate the console connector and its attached wire loop on the original power supply PCB.

  2. Apply flux to the connector solder joints.

  3. Use solder wick to remove the solder securing the connector assembly to the PCB.

  4. Desolder the ends of the attached wires from the main PCB portion, leaving the wire loop attached to the connector assembly.

  5. Continue removing solder until the complete connector assembly and its wire loop come free from the original PCB.

Do not cut or remove the wire loop from the connector assembly.

Do not force the connector out. If it does not come free easily, continue removing solder until the connections are completely clear.

8. Install the OEM Connector on N64PWR-E

  1. Insert the original connector assembly into the corresponding footprint on N64PWR-E.

  2. Make sure the connector is fully seated against the PCB.

  3. Position the retained OEM wire loop as required by the N64PWR-E PCB.

  4. Apply flux and solder each connection, including the retained wire connections.

  5. Inspect every solder joint for:

    • Complete solder flow

    • Cold joints

    • Solder bridges

    • Incomplete connections

9. Final Electrical Checks

Before applying power again, repeat the electrical checks.

With USB-C disconnected:

  1. Check each power rail to GND for unintended shorts.

  2. Check between the power rails for unintended shorts.

  3. Inspect the OEM connector and wire-loop solder joints carefully.

Do not apply power if a hard short is detected.

Once the continuity checks pass:

  1. Connect a compatible USB-C PD power source.

  2. Confirm that the red fault LED briefly flashes and then turns off.

  3. Confirm that both green LEDs illuminate.

  4. Verify approximately 3.3V and 12V at the output.

If both green LEDs operated correctly before the OEM connector was installed but one no longer illuminates afterward, disconnect power and carefully inspect the connector installation and the affected output rail.

10. Optional: Disable the Green Status LEDs

After testing is complete, the two green status LEDs may be disabled if desired.

Locate the 0Ω resistor labeled LED and remove it.

Removing this resistor disables both green LEDs and has no effect on normal N64PWR-E operation.

This step is completely optional.

The red fault LED remains available for power-source diagnostics.

11. Reassemble the Power Supply

Once all electrical testing has been successfully completed:

  1. Disconnect USB-C power.

  2. Place the completed N64PWR-E assembly into the lower half of the original power supply housing.

  3. Make sure the selected USB-C faceplate is correctly seated over the USB-C connector and its locating tab is engaged with the PCB.

  4. Verify that the faceplate correctly interfaces with the shell.

  5. Install the upper half of the housing.

  6. Make sure the shell closes naturally without forcing the PCB, USB-C module, or faceplate.

  7. Reinstall the two original 4.5 mm Gamebit screws.

The N64PWR-E power supply is now ready for its first test with the console.

12. Test with the Nintendo 64

  1. Make sure the Nintendo 64 is switched OFF.

  2. Connect the completed N64PWR-E power supply to the Nintendo 64.

  3. Connect a compatible USB-C PD power source to N64PWR-E.

  4. Turn on the Nintendo 64.

  5. Verify that the console powers on and boots normally.

For a complete functional test, connect the console to a display, insert a known-good game cartridge, and verify normal operation.

If the green status LEDs were left enabled, both should remain illuminated during operation.

If the console does not behave as expected, switch it off and disconnect USB-C power before inspecting the installation.

Congratulations! Your N64PWR-E Installation Is Complete!

Your original Nintendo 64 power supply housing has now been converted to USB-C Power Delivery while retaining the original console-side connector and factory-style fit.

Troubleshooting

Red Fault LED Remains On

The USB-C source has not provided the required power profile.

  • Verify that the power adapter supports 15V at 2A minimum.

  • Use a 30W or greater USB-C PD adapter with a 15V profile.

  • Try another known-good USB-C PD power adapter and cable.

  • Measure VBUS with a multimeter.

When the red fault LED remains illuminated, VBUS should be disabled and measure approximately 0V.

When negotiation succeeds, the red LED should turn off and VBUS should measure approximately 15V.

No Green LEDs

Disconnect power and verify:

  • Approximately 15V is present on VBUS.

  • There are no shorts between the power rails or from a power rail to GND.

  • The three module interconnections are properly soldered.

Only One Green LED Illuminates

One of the output rails is not operating correctly.

Disconnect power and check the affected rail for shorts or assembly problems.

If both green LEDs worked during the assembled-board test before the OEM connector was transplanted, but one fails afterward, carefully inspect the connector installation and associated output rail.

Incorrect 3.3V or 12V Output

Disconnect power immediately.

Check:

  • Rail-to-GND shorts

  • Rail-to-rail shorts

  • Solder joints

  • OEM connector installation

  • Module interconnections

Do not connect N64PWR-E to the console until both output voltages are correct.

Console Does Not Power On

If the 3.3V and 12V outputs tested correctly before reassembly:

  • Disconnect USB-C power.

  • Inspect the OEM connector and wire-loop solder joints.

  • Verify that the connector is completely seated.

  • Repeat the continuity checks.

  • Confirm the Nintendo 64 is known to operate correctly.

If the green LEDs were left enabled and one or both turn off when the console is powered on, disconnect power and investigate the corresponding rail for a short or excessive load.

If you need additional assistance, please contact Fairy Bottle Productions.