Hardware/Testpoints

General

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

EXI0

• TP101 - CLK
• TP102 - CS
• TP176 - MISO (Device out, Wii U in)
• Test point between TP100 and TP176 - MOSI (Device in, Wii U out)

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

Misc/Unk

• TP6 - To video chip and SoC
• TP8 - U13 pin4
• TP9 - Fake Power Button (active low/pullup, pressed=0.0v, not pressed=3.3v), connected to SMC and RTC. Eject button will also pulse this low.
• TP10 - To video chip (and elsewhere?)
• TP11 - Direct to SoC, no other connections.
• TP12 - Direct to SoC, no other connections.
• TP13 - Direct to SoC, no other connections.
• TP14 - Direct to SoC, no other connections.
• TP20 - Direct to SoC, no other connections.
• TP31 - Composite related?
• TP32 - Composite related?
• TP33 - Composite related?
• TP56 - Direct to SoC, no other connections.
• TP57 - Direct to SoC, no other connections.
• TP64 - To U1014 (comparator?) pin12
• TP65 - TP2003
• TP66 - TP2000
• TP67 - to front faceplate
• TP68 - to front faceplate
• TP69 - Direct to SoC, no other connections.
• TP70 - TP2002
• TP83 - Direct to video chip.
• TP84 - To HDMI connector?
• TP86 - Direct to SoC, no other connections. Lots of capacitors? Strap resistor?
• TP87 - Direct to SoC, no other connections. Lots of capacitors? Strap resistor?
• TP109 - USB?
• TP110 - Wire goes past video chip away from SoC.
• TP111 - To HDMI connector?
• TP115 - 12V DC plug positive?
• TP116 - 12V DC plug positive?
• TP117 - 12V DC plug negative?
• TP118 - 12V DC plug negative?
• TP127 - ARM/IOP power rail?
• TP141 - Connected to RTC. Pulled up by Q1080?
• TP144 - Reset? Or functions like one when pulled down by a 3.3Kohm resistor.
• TP145 - Connection between RTC and SMC, weirdly sensitive to measurement (power LED reverts to red, but SoC continues running)
• TP147 - Connected to RTC and pin4 of U1041 (Comparator in?)
• TP148 - Connected to RTC and Q1093 gate. Makes its way to U1041 Pin13 (Comparator ?)
• TP149 - Connected to LV5066 pin2 (EN) and RTC. Regulators enable? Pulldown resistor?
• TP151 - Connected to transistor output, goes to SoC
• TP170 - Eject Button (active low/pullup, pressed=0.0v, not pressed=3.3v)
• TP191 - Direct to SoC, no other connections.
• TP1000 - Direct to SoC, no other connections.
• TP1001 - Direct to SoC, no other connections.
• TP1002 - Direct to SoC, no other connections.
• TP1003 - Direct to SoC, no other connections.
• 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 - To SMC
• TP2001 - To faceplate
• TP2002 - Power Button (active low/pullup, pressed=0.0v, not pressed=3.3v)
• TP2003 - To some transistor gate?
• TP2004 - GND