This page lists and describes the purposes of the testpoints accessible on a 3DS's circuit board.

Old 3DS

The signals were figured out using a PicoScope 2206B running at least at 2 MS/s, ±5 V, 8-bit, 1:10, DC. All measures of digital signals were referenced by the square GND pad at the bottom left corner.

TP Net Name U[V] S/O/A/R (1) A/D/P/G|C/OC|R/T (2) Domain f[Hz] Description
TP1 GND 0V S G Charger -
TP2 +1.2V 1.2V O P ? -
TP3 +2.8V 2.8V O P ? -
TP4 Uchrg 3V - 5V S P Charger Port -
TP5 +1.8V 1.8V O P ? -
TP6 +2.8V 2.8V O P ? -
TP7 +1.8V 1.8V S P ? -
TP8 Ubat 3.5V - 3.8V S P Battery -
TP9 +3.9V 3.6V - 3.9V S P ? - 3.9V when off, around 3.6V when active
TP10 +1.8V 1.8V S P ? -
TP11 +1.8V 1.8V S P ? -
TP12 +4V 3.7V - 4V O P ? - 4V during standby, around 3.75V when active
..
TP41 Bot Screen Lights Source 10V A P ? -
TP42 Bot Screen Lights Sink 0.2V A P ? -
..
TP46 Enable? Supply? 3.2V A PP?P? ? - High when displays are active but low during boot
..
TP48 HEADPHONE-GND 2.2Vpp O? G headphone ~ 33kHz Headphone ground
TP49 HEADPHONE-PD 1V O OC headphone - headphone Plug Detection
TP50 HEADPHONE-LEFT 2.2Vpp A A+PP headphone referenced to TP48, AC
TP51 HEADPHONE-RIGHT 2.2Vpp A A+PP headphone referenced to TP48, AC
..
TP58 WLAN button 1.8V O OC side buttons -
..
TP67 SYS-LED-BLUE-LowsideDriver 2.2V - 3V O P+T leds 0Hz, 2kHz Static when acvtive, PWM when in standby
TP68 JPAD-Y 0.2V - 1.5V A A circle pad - Voltage U > D
TP69 JPAD-X 0.2V - 1.5V A A circle pad - Voltage L > R
TP70 SYS-LED-RED-LowsideDriver (2.2V - 3V)? ? P+T leds ?
..
TP80 START 1.8V O OC main buttons -
TP81 SELECT 1.8V O OC main buttons -
TP82 R 1.8V O OC main buttons -
TP83 L 1.8V O OC main buttons -
TP84 +1.8V 1.8V O P? ? - perhaps voltage rail for buttons?
TP85 DPAD-U 1.8V O OC main buttons -
TP86 X 1.8V O OC main buttons -
TP87 DPAD-L 1.8V O OC main buttons -
TP88 Y 1.8V O OC main buttons -
TP89 A 1.8V O OC main buttons -
TP90 DPAD-R 1.8V O OC main buttons -
TP91 DPAD-D 1.8V O OC main buttons -
TP92 B 1.8V O OC main buttons -
TP93 ? 0V S G? D? A? ? -
TP94 ? 0V S G? D? A? ? -
..
TP96 +3.2V 3.2V O P? ? -
..
TP131 TOP-SCREEN-PWM 1.8V A D ? 1166.7kHz 2.7% (darkest) - 25% (brightest) dutycycle
TP132 BOT-SCREEN-PWM 1.8V A D ? 1166.7kHz 5% (darkest) - 54% (brightest) dutycycle
..
TP144 IR-I2C-SCL 3.2Vp R OC ir-i2c 390kHz Address: 9Ah (W), 9Bh (R)
..
TP146 IR-I2C-SDA 3.2Vp R OC ir-i2c 390kHz
..
TP149 ? 2Vp A C?+R ? 47.6kHz clock?
..
TP150 ? 2Vp A C?+R ? 1.52MHz clock?
..
TP152 ? 1.8Vp A D ? 16.7MHz clock?
..
TP189 VIDEO-CLK 1.8Vp A D+T video signal 11.1MHz at home screen
TP190 VIDEO-HSYNC 1.8Vp A D+R video signal 24.77kHz at home screen
TP191 VIDEO-VSYNC 1.8Vp A D+R video signal 59.8Hz ~60 at home screen
..
TP213 TOUCH-Y? 2V, 2Vp O D, D+R touch
TP214 TOUCH-X? 0V, 2Vp O A, A+R touch
TP215 TOUCH-Y? 2V, 2Vp O D, D+R touch
TP216 TOUCH-X? 0V, 2Vp O A, A+R touch
..
TP249 NAND-DAT0 O? PP? nand
TP250 NAND-DAT1 O? PP? nand
TP251 NAND-DAT2 O? PP? nand
TP252 NAND-DAT3 O? PP? nand
TP253 NAND-CMD O? PP? nand
TP254? NAND-CLK? O? PP? nand

[1] Presence: S = Static (always present); O = device On; A = Active (not in standby); R = when Required.

[2] Electrical characteristics: Signal Type: A = Analogue; D = Digital; P = Power; G = Ground; Driver: PP = Push Pull; OC = Open Collector; PU/PD = Pull Up/Down Typical Waveforms: R = Rectangular; T = Triangular;