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Repair guide

Fix an N64 black screen: cartridge slot, expansion port and Jumper Pak

Most black screens come from dirty or unseated connections in the cartridge slot or expansion port, and from running without a Jumper Pak or Expansion Pak.

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Cartridge · Easy · about 45 minutes. Worth doing. Reports say this fix helps on many machines.

You are in the right place if: The N64 powers on but shows a black screen or an incomplete boot, even with a clean game.

Before you start

  • Do not use abrasives on cartridge pins. See ConsoleMods cleaning guidance.
  • Do not blow into cartridges.
  • Do not remove the main board if you only need to clean the slot.

Board revisions and models

N64 boards vary from NUS-CPU-02 through NUS-CPU-09-1 for NTSC and NUS-CPU-P-01 to P-03 for PAL, but slot cleaning is the same on all.

Parts you may need

  • N64 Jumper Pak. needed if no Expansion Pak Amazon · eBay
  • Contact cleaner. switches and ports Amazon · eBay

Tools

  • Gamebit 4.5mm security screwdriver. N64 base screws Amazon · eBay
  • Tweezers and light. debris removal Amazon · eBay
  • Compressed air. blowing out the slot Amazon · eBay

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Step by step

  1. Power off and unplug Remove the cartridge and anything in the expansion port.
  2. Check the Jumper Pak or Expansion Pak An N64 needs one of them installed in the top port to run. Seat it fully and try again.
  3. Clean the cartridge contacts Wipe the cart's edge with an alcohol swab, dry it and try again. Test with a second cartridge.
  4. Inspect the cartridge slot Shine a light into the slot and look for debris. One restorer found thick hairs in the port that were removed with tweezers.
  5. Clean the slot Wrap an alcohol-dampened cloth around a card and slide it in and out, then blow it out with compressed air.
  6. Clean the expansion port Repeat for the top port and the Pak connector, and clean the reset and power switches with contact cleaner.
  7. Try other AV and power Test another AV cable and the power adapter to rule them out.
  8. Open the console if needed If it still fails, open the console and clean around the connectors directly, taking care with the screws.
  9. Retest Run several games and reseat the cartridge a few times to confirm it holds.

Tips, tales and maybes

Found in write-ups and forum threads. These are other people's reports, not tested by us.

  • Story (Medium confidence). A PAL N64 with a black screen was cured by cleaning the cartridge slot, expansion port and switches with contact cleaner. The slot also contained long hairs. Source
  • Tip (Medium confidence). ConsoleMods notes the N64 needs either a Jumper Pak or an Expansion Pak to operate. Source
  • Tip (Medium confidence). The six security screws on the base take a 4.5mm gamebit according to one N64 teardown. Source

Guides we used

We wrote the steps in our own words from these. They have the photos and the full detail, so please read them and support their authors.

Boards and models vary, so check what is in front of you. A repair can involve hot tools, chemicals and, on some machines, dangerous voltages. You do it at your own risk.

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