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Nintendo 64 Mainboard Replacement

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Nintendo 64 NUS-CPU-03 mainboard top (Evan-Amos)
NUS-CPU-03 mainboard out of its case: CPU-NUS (U10) left, RCP-NUS (U9) right, the Game Pak connector P5 above them and the Memory Expansion connector P1 below

Nintendo's service centres repaired a faulty Nintendo 64 in one of two ways: they exchanged the whole console for one of the same colour, or they did a board-level swap, fitting a remanufactured main PCB (part 35429, "PCB, MAIN CPU CD NUS REMAN") and returning the faulty board for a core credit.[1][2] The board comes out the same way for any bench work on it, including the audio and video repairs and a recap. Nintendo's manual gives the exploded view, the parts list, the screw torques and the points to watch on reassembly, but not a step-by-step order; the order below follows iFixit's motherboard guide.[1][3]

The procedure applies to the NUS-001 Control Deck. Replacement boards now come from donor consoles; match the region and, where it matters for the repair, the board revision printed on the board.[1][4]

Symptoms

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A board swap is the last step, after the supply, the Jumper Pak or Expansion Pak, the cartridge and the cables have been ruled out. The checks are in the Nintendo 64 Troubleshooting Guide.

Safety

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  • Switch off, unplug the AC Power Supply from the wall, then press the lock release button on the bottom of the supply and pull it out of the console.[5]
  • The mains side of the supply is inside the supply, not the console; the console runs on +3.3 V and +12 V.[6]
  • Handle the board by its edges on an anti-static surface. Nintendo required boards returned for credit to travel in an anti-static shielding bag and refused credit for any that did not.[2]

Tools and parts

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  • 4.5 mm Gamebit for the base screws; Phillips #1 and #2 drivers inside.[3][7]
  • Nintendo's Jumper Pak Ejector (NUS-012), supplied with the Expansion Pak, for removing the Jumper Pak.[1][8]
  • A small metal spudger for the brackets round the Memory Expansion slot.[3]
  • A torque screwdriver if you want to meet Nintendo's figures (table below).[1]

Procedure

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Nintendo 64 exploded view (Nintendo ASC manual)
Nintendo's exploded view of the Control Deck. 20 is the main PCB, 21 and 22 the upper and lower metal plates as drawn, 40 the front contact shield at the Memory Expansion slot, 41 the Jumper Pak; 32 to 39 are the screws listed in the torque table.

Removing the board

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  1. Remove the Memory Expansion cover by pushing in its tab and pulling it out.[3]
  2. Pull out the Jumper Pak or Expansion Pak with the ejector tool. The Jumper Pak's label comes away with it and does not have to be removed first.[1][3]
  3. Turn the console over and remove the six screws in the base with the 4.5 mm Gamebit.[3][9]
  4. Remove the two front feet.[3]
  5. Turn the console the right way up and lift off the top cover. The Game Pak slot doors and their two chamber cover springs stay with the top cover.[10][1]
  6. Remove the fourteen screws holding the upper metal plate with the #2 Phillips driver, slide the plate back and lift it off.[3]
  7. Remove the two screws iFixit marks with the #1 driver, then the screw to the right of the power LED with the #2.[3]
  8. Remove the small metal brackets at the back of the Memory Expansion slot, at its front and behind it, prising them with the spudger. The one at the front is Nintendo's item 40, "CONTACT, SHIELD FRONT NUS". Keep it: Nintendo told its service centres to move this shield from the faulty board to the replacement.[3][11][2]
  9. Remove the seven screws holding the next metal plate with the #2 driver and lift the plate off.[3]
  10. Remove the four screws holding the board with the #1 driver and lift the board out.[3]

The heatsink parts between the chips and the upper plate (items 26, 27 and 31 in the exploded view) are not in Nintendo's parts list.[10][11] ConsoleArtisan describes the thermal path as three silicone pads, on the CPU, the RCP and the memory, and recommends replacing dried-out pads with 1 mm silicone pads, not paste. Its author says the N64 notes come from documentation and reports, with little bench time on the machine.[12]

Fitting the board

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  1. Move the front contact shield (item 40) from the old board to the replacement.[2][11]
  2. Refit the board and the plates in the reverse order. Nintendo specifies a tightening torque for every screw, to comply with FCC regulations; the table gives Nintendo's figures against the item numbers in the exploded view.[1][11]
  3. Before refitting the top cover, check both chamber cover springs. Each must sit between the edges of its notch in the upper housing; there is one notch on either side of the chamber door, for the front and back springs.[1]
  4. The logo panel at the front of the upper housing fits only one way round. Handle it carefully.[13]
  5. Refit the base screws and the feet.[3]
  6. Insert the Jumper Pak or Expansion Pak carefully, without impact.[1] The console does not operate without one of them in the slot.[5]
Nintendo 64 chamber cover spring notch (Nintendo ASC manual)
Nintendo's drawing of a chamber cover spring correctly seated between the edges of its notch inside the upper housing
Nintendo 64 Control Deck screws and torques
Item Parts list description Qty Screw type Torque (kgf/cm, as printed) Tolerance
32 SCREW, M3 X 5.4 PHP BTAP CHROMATE 10 Bind tapping M3 × 5.4 9 ±2.0
33 SCREW, M3 X 6 BHP BTAP BLACK 2 Tight bind M3 × 6 9 ±2.0
34 SCREW, M3 X 7 PHP MACH BING SEM 2 Small bind M3 × 7 5 ±1.0
35 SCREW, M3 X 18 PHP SELFTAP CHROMATE 2 Self tapping M3 × 18 5 ±1.0
36 SCREW, M3 X 10 PHP SELFTAP CHROMATE 8 Self tapping M3 × 10 5 ±1.0
37 SCREW, M3 X 12 PHP SELFTAP UNICHRO 4 Self tapping M3 × 12 5 ±1.0
38 SCREW, M2 X 18 BHP SELFTAP CHROMATE 2 Bind tapping M2 × 18 2 ±0.5
39 SCREW, M3 X 12 LH SELFTAP CHROMATE 6 LH tapping M3 × 12 7 ±1.0

Item numbers, descriptions and quantities are from the parts list; screw types and torques from the torque table. The two are matched by screw size; the M3 × 12 screws are told apart by the LH in their description.[1][11] Nintendo does not say which hole each screw goes in beyond what the exploded view shows.[10]

Testing

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  • Switch on with a known-good Game Pak and check the picture, both audio channels and all four controller sockets.
  • Nintendo's service centres ran the N64 test cartridge's Auto Tests, which exercise the whole Control Deck, and its individual controller, Rumble Pak, RSP, RDP, audio and video tests. A red light on the cartridge indicates a failure.[14]
  • If the console does not start, check first that the Jumper Pak or Expansion Pak is fully seated.[5]
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References

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  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Nintendo of America, Authorized Service Center Manual, Field Service Dept., Revision June 2002, chapter 7, p. 43: whole unit or board-level swap; removing the Jumper Pak with the ejector tool; torque table; chamber cover spring notches; inserting the Jumper Pak without impact. Hosted as File:Nintendo Authorized Service Center Manual June 2002.pdf; see Nintendo Authorized Service Center Manual (June 2002).
  2. ↑ 2.0 2.1 2.2 2.3 Nintendo of America, Authorized Service Center Manual, Revision June 2002, chapter 2, "Core credits" (p. 19): core credit for malfunctioning N64 CPU-PCB assemblies returned in anti-static shielding bags; the note to move the small contact shield at the Terminator Pak connector (item 40) to the replacement PCB.
  3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 iFixit, "Nintendo 64 Motherboard Replacement", guide 1608, by tonymag28 and contributors (retrieved 2026-10-25). Step order and screw counts: six base screws, two feet, fourteen plate screws, two small screws, one beside the LED, three brackets at the expansion slot, seven screws and a second plate, four board screws.
  4. ↑ N64brew Wiki, "Video DAC" (retrieved 2026-10-25). Video chips and output differences by board revision and region.
  5. ↑ 5.0 5.1 5.2 Nintendo of America, Nintendo 64 Instruction Booklet, form NUS-S-HB-USA-4 (1996), p. 3 (PDF page 5): the Control Deck will not operate without the Jumper Pak in the Memory Expansion connector; p. 9 (PDF page 11): switch off, unplug from the wall, press the lock release button on the bottom of the AC Power Supply and pull it out. Hosted as File:Nintendo 64 Instruction Booklet NUS-S-HB-USA-4.pdf.
  6. ↑ The Hardware Book, "N64 Power" (retrieved 2026-10-25), after Christopher James Pepi's Video Game Power Supply Voltages and Minor Repair FAQ. NUS-002 outputs 3.3 V DC 2.7 A and 12 V DC 0.8 A.
  7. ↑ iFixit, "Nintendo 64 Screwdriver" (retrieved 2026-10-01). 4.5 mm Gamebit for the console.
  8. ↑ N64brew Wiki, "Parts and Accessories" (retrieved 2026-10-01). Jumper Pak Ejector NUS-012 supplied with the Expansion Pak.
  9. ↑ Dreamcast.nu, "Nintendo 64 (N64) disassembly and recap", 10 November 2021. Six Gamebit screws in the base; Phillips screws holding the shields and board.
  10. ↑ 10.0 10.1 10.2 Nintendo of America, Authorized Service Center Manual, Revision June 2002, p. 45: Nintendo 64 exploded view. Hosted as File:Nintendo 64 exploded view (Nintendo ASC manual).png.
  11. ↑ 11.0 11.1 11.2 11.3 11.4 Nintendo of America, Authorized Service Center Manual, Revision June 2002, p. 46: Control Deck parts list, including item 20 (part 35429, PCB, MAIN CPU CD NUS REMAN), items 32 to 39 (screws with quantities) and item 40 (part 34708, CONTACT, SHIELD FRONT NUS).
  12. ↑ ConsoleArtisan, "Nintendo 64 Repair Reference" (retrieved 2026-10-25), "Crashes and color corruption after it warms up". Three silicone thermal pads (CPU, coprocessor, memory); replace with 1 mm pads, not paste. The page states that its author has little hands-on time with the N64 and works from documentation.
  13. ↑ Nintendo of America, Authorized Service Center Manual, Revision June 2002, p. 44: label positions and the logo panel.
  14. ↑ Nintendo of America, Authorized Service Center Manual, Revision June 2002, pp. 47–49: instructions for the N64 test cartridge.
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