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Nintendo 3DS

From Repair Wiki
Nintendo 3DS
Manufacturer Nintendo
Code name CTR
Release date 2011-02-26
Device type Game Console

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Explanatory Guides

Repair Guides

 Affects partTypeDifficulty
Nintendo 3DS blue light turns on then turns offPart replacement

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Device pictures

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PCB pictures

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Reference measurements (also schematics if available)

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More Information/External Sources


Not to be confused with the New Nintendo 3DS which has many dissimilar components most notably the motherboard.

Nintendo 3DS can also refer to the Nintendo 2DS which shares almost every component with one less of each hinge, speaker, and D.

Power-up sequence

From power loss

This happens as soon as battery or charger voltage is applied to the system.

  • Voltage regulation kicks in, the MCU gets powered
  • The MCU boots up
    • I2C lines are initialized
    • Configuration resistors are scanned
    • Power regulation is configured
      • Battery presence detection is configured (independent of pins BAT+, BAT-, or the middle pin being shorted anywhere)
      • Charger presence is detected
    • Battery rejection is run

The system is ready for the handling of the Power button press, even if the configuration is invalid (shorted battery lines, lack of battery, battery rejection says the system is refused from turning on, etc.).

Soft start

This happens when the press of the Power button is detected by the MCU.

  • Do checks of the configuration resistor scans
    • If this is a kiosk unit, and charger *presence* is not detected, cancel the power sequence
  • Change the Power LED animation to the fade-in pattern
  • Configure voltage regulation for the SoC
  • Take SoC out of reset (/RESET1 and /RESET2 are no longer active)
  • Battery rejection is run
    • If the battery is rejected, do emergency shutdown
  • The PLL eventually locks, and the ARM9 bootrom starts executing, shortly followed by the ARM11 bootrom
    • Cryptographic things are initialized
    • Boot devices are discovered
    • First valid boot option is booted, or if none are valid, the infamous blue screen is displayed