Hardware/Testpoints

General

The Wii U motherboard exposes several test points, primarily on the bottom of the motherboard (CPU heatsink facing down).

EXI0

TP100 - MOSI (Device in, Wii U out. Next to 176.) (impedance: 40ohm)
TP101 - CLK (impedance: 40ohm)
TP102 - CS (impedance: high)
TP176 - MISO (Device out, Wii U in) (impedance: 476ohm)

DEBUG

These pins are set to various 8-bit values to indicate the current stage of boot0.

TP50 - DEBUG0
TP51 - DEBUG1
TP52 - DEBUG2
TP53 - DEBUG3
TP55 - DEBUG4
TP54 - DEBUG5
TP48 - DEBUG6
TP49 - DEBUG7

Disc Drive

TP2 - Disc drive 3.3V rail
TP3 - Disc drive 5V rail
TP4 - Disc drive 12V rail
TP5 - Disc eject (pulse high for eject)
TP18 - Disc presence sensor (receiver)
TP19 - Disc presence sensor (emitter)
TP76 - Disc inserted (active low)
TP114 - Disc drive 3.3V always-on rail

Misc/Unk

TP1 - wire goes all the way down near RTC? Also connects to SoC.
TP6 - To video chip and SoC
TP7 - Fan Pin3
TP8 - U13 pin4
TP9 - Fake Power Button (active low/pullup, pressed=0.0v, not pressed=3.3v), connected to SMC Pin33 and RTC. Eject button will also pulse this low.
TP10 - To video chip (and elsewhere?)
TP11 - Direct to SoC, no other connections. (impedance: 0.6ohm)
TP12 - Direct to SoC, no other connections. (impedance: 20ohm, measures: 1V?)
TP13 - Direct to SoC, no other connections. (impedance: high)
TP14 - Direct to SoC, no other connections. (impedance: high)
TP15 - Connects to SMC Pin18, regulator-related?
TP16 - Connects to SMC Pin29, regulator-related?
TP20 - Direct to SoC, no other connections. (impedance: 1Megohm)
TP21 - SDCard CLK (Pin5)
TP22 - SDCard CMD (Pin2)
TP23 - SDCard DAT0 (Pin7)
TP24 - SDCard DAT1 (Pin8)
TP25 - SDCard DAT2 (Pin9)
TP26 - SDCard CD/DAT3 (Pin1)
TP27 - SDCard CD1
TP28 - SDCard WP2
TP29 - SDCard VDD
TP30 - SDCard GND
TP31 - Composite related?
TP32 - Composite related?
TP33 - Composite related?
TP34 - Connects to RAM module?
TP35 - Connects to RAM module?
TP36 - Connects to RAM module?
TP37 - Connects to SMC Pin27, regulator-related?
TP38 - Connects to SMC Pin17, regulator-related?
TP39 - Connects to SMC Pin20, front USB enable
TP56 - Direct to SoC, no other connections. (impedance: high)
TP57 - Direct to SoC, no other connections. (impedance: high)
TP58 - Connects to RAM module?
TP59 - Connects to RAM module?
TP60 - Connects to RAM module?
TP61 - Connects to RAM module?
TP62 - Connects to RAM module?
TP64 - To U1014 (comparator?) pin12
TP65 - TP2003
TP66 - LED_R, TP2000
TP67 - to front faceplate
TP68 - to front faceplate, not connected to any buttons. When pulled low while powered off, power LED turns orange and eject button is not responsive?
TP69 - Direct to SoC, no other connections. On WUP-DEV-X9, it resides near the second drive connector and is connected to the Classic Controller board (with an MCU between it?). Can be used with a Gamecube Controller. (impedance: high, measures: 3.3v)
TP70 - TP2002
TP73 - backup battery 3v3?
TP78 - Fan Pin1
TP80 - SMC Pin15, rear USB enable
TP83 - Direct to video chip.
TP84 - To HDMI connector?
TP86 - Direct to SoC, no other connections. Lots of capacitors? Reference voltage? 1.036v
TP87 - Direct to SoC, no other connections. Lots of capacitors? Reference voltage? 0.753v
TP88 - SMC Pin35, connected to TP152, Optical power enable
TP95 - SMC Pin22, front USB power fault
TP99 - Direct to DRH, no other connections.
TP109 - SMC Pin16, rear USB fault
TP110 - Wire goes past video chip away from SoC.
TP111 - To HDMI connector?
TP115 - 15V DC plug positive
TP116 - 15V DC plug positive
TP117 - 15V DC plug negative (0V)
TP118 - 15V DC plug negative (0V)
TP120 - 15V power rail B
TP122 - Always-on 3v3 power rail
TP123 - 1.5v power rail B
TP125 - ARM/IOP PGOOD
TP126 - ARM/IOP LV5065 TD1/TD2?
TP127 - ARM/IOP power rail? 1.0v
TP128 - ARM/IOP GND
TP129 - ??? power rail, 1.15v
TP130 - ??? GND
TP132 - to comparators?
TP135 - 5v power rail A
TP136 - 12v power rail
TP137 - 3v3 power rail B ref GND
TP138 - 3v3 power rail B
TP139 - WiFi module 3v3
TP141 - Connected to RTC. Pulled up by Q1080?
TP142 - 3v3 power rail for HDMI Encoder
TP144 - Reset? Or functions like one when pulled down by a 3.3Kohm resistor.
TP145 - Connection between RTC and SMC, SMC nRST, sensitive to measurement (power LED reverts to red, but SoC continues running)
TP146 - SMC Pin1, to RTC, Bluetooth, and 5GHz module
TP147 - Connected to RTC and pin4 of U1041 (Comparator in?)
TP148 - Connected to RTC and Q1093 gate. Makes its way to U1041 Pin13 (Comparator ?). When pulled low by 3.3kohm resistor, front LED blinks red until 15V unplug+replug.
TP149 - Connected to LV5066 pin2 (EN) and RTC. Regulators enable? Pulldown resistor?
TP151 - Connected to transistor output, goes to SoC
TP152 - SMC Pin35, connected to TP88. Optical power enable
TP153 - SMC I2C SCL
TP154 - SMC I2C SDA
TP155 - SMC Pin14, WiFi module pin 14
TP156 - SMC Pin23, BT module pin 12
TP157 - SMC Pin19, 5GHz module pin 20
TP158 - 1.5v power rail A
TP160 - GND
TP161 - GND
TP162 - 1.5v power rail A ref GND
TP163 - 12v power rail ref GND
TP164 - Always-on 3v3 ref GND
TP165 - 15V power rail B ref GND
TP166 - 5v power rail A ref GND
TP166 - 1.5v power rail B ref GND
TP168 - 3v3 power rail C
TP169 - 3v3 power rail C ref GND
TP170 - Eject Button (active low/pullup, pressed=0.0v, not pressed=3.3v)
TP171 - SMC Pin28, Disc present
TP172 - SMC Pin36, BT module pin 13
TP173 - SMC Pin37, WiFi module pin 7
TP174 - SMC Pin38, 5GHz module pin 16
TP175 - Connected to RTC and SMC, pulses between 3.3v and 0v at 1Hz
TP179 - Direct to DRH, pullup resistor?
TP187 - LV5064 pin21 (and more?)
TP191 - Direct to SoC, no other connections. Nearby Espresso JTAG vias.
TP1000 - Direct to SoC, no other connections. (impedance: 40ohm)
TP1001 - Direct to SoC, no other connections. (impedance: 40ohm)
TP1002 - Direct to SoC, no other connections. (impedance: 40ohm)
TP1003 - Direct to SoC, no other connections. (impedance: 40ohm)
TP1004 - LV5064 pin10, temp sensing? direct to SoC
TP1005 - LV5064 pin11, temp sensing? direct to SoC
TP1006 - LV5064 pin12, temp sensing? direct to SoC
TP1007 - LV5064 pin13, temp sensing? direct to SoC
TP1008 - LV5064 pin14, temp sensing? direct to SoC
TP1010 - LV5064 pin9, temp sensing? direct to SoC
TP2000 - LED_R, to SMC Pin40, PWM at 100Hz?
TP2001 - LED_Y, to faceplate
TP2002 - Power Button (active low/pullup, pressed=0.0v, not pressed=3.3v)
TP2003 - To some transistor gate?
TP2004 - GND
TP3000 - Only seen on WUP-DEV-X9, near DRAM
TP3001 - Only seen on WUP-DEV-X9, near DRAM
TP3002 - Only seen on WUP-DEV-X9, near DRAM
TP3003 - Only seen on WUP-DEV-X9, near DRAM
TP3004 - Only seen on WUP-DEV-X9, near DRAM
TP3005 - Only seen on WUP-DEV-X9, near DRAM
TP3006 - Only seen on WUP-DEV-X9, near DRAM
TP3007 - Only seen on WUP-DEV-X9
TP3008 - Only seen on WUP-DEV-X9
TP3009 - Only seen on WUP-DEV-X9
TP3010 - Only seen on WUP-DEV-X9
TP3011 - Only seen on WUP-DEV-X9
TP3012 - Only seen on WUP-DEV-X9
TP3013 - Only seen on WUP-DEV-X9
TP3020 - Only seen on WUP-DEV-X9, emerges from under left WiFi card.
TP3021 - Only seen on WUP-DEV-X9, emerges from under left WiFi card.
TP3022 - Only seen on WUP-DEV-X9
TP4000 - Direct to SoC, no other connections. Not present on WUP-DEV-X9. (impedance: 40ohm, measures: 0v)
TP4001 - Direct to SoC, no other connections. Not present on WUP-DEV-X9. (impedance: high, measures: 3.3v)
TP4002 - Direct to SoC, no other connections. Not present on WUP-DEV-X9. (impedance: 40ohm, measures: 0v)
TP4003 - Direct to SoC, no other connections. Not present on WUP-DEV-X9. (impedance: high, measures: 3.3v)

Removed/Dev Testpoints

Some testpoints can be seen on the WUP-DEV-X9 and CAT-HDD-X5 daughterboard which fit into numeric gaps in WUP-01's testpoints. There are some discrepancies/overlaps in CAT-HDD-X5 testpoints, however.

TP43 - present on CAT-HDD-X5, EXI_INT
TP45 - present on CAT-HDD-X5, EXI_CS
TP47 - present on CAT-HDD-X5, EXI_CLK
TP48 - present on CAT-HDD-X5, EXI_DO
TP50 - present on CAT-HDD-X5, EXI_DI
TP53 - present on CAT-HDD-X5, no label
TP55 - present on CAT-HDD-X5, no label
TP57 - present on CAT-HDD-X5, no label
TP58 - present on CAT-HDD-X5, V_IN
TP62 - present on CAT-HDD-X5, V_5.0
TP68 - present on CAT-HDD-X5, V_1.2
TP72 - present on CAT-HDD-X5, V_2.5
TP74 - present on CAT-HDD-X5, V_3.3
TP1001 - present on CAT-HDD-X5, SEL_CS
TP1002 - present on CAT-HDD-X5, SEL_WP
TP1003 - present on CAT-HDD-X5, SDIO_D3
TP1004 - present on CAT-HDD-X5, SDIO_D2
TP1005 - present on CAT-HDD-X5, SDIO_D1
TP1006 - present on CAT-HDD-X5, SDIO_D0
TP1007 - present on CAT-HDD-X5, SDIOCMD
TP1008 - present on CAT-HDD-X5, SDIOCLK
TP1009 - present on CAT-HDD-X5, POWER_SW
TP1010 - present on CAT-HDD-X5, FPOFF_SRQ
TP1011 - present on CAT-HDD-X5, DCDC_OFF
TP1012 - present on CAT-HDD-X5, VDD_RSTOUT
TP1013 - present on CAT-HDD-X5, VDD1
TP1014 - present on CAT-HDD-X5, VDD2