For those looking to use HDMI2C1-6C1 in place of original U21 chip to have full functionality/video output capabilities, use the following guide to fix your system. Not all pins of the chip will be used, since we don't really care about CEC and HEAC/Utility lines (those lines are already protected on the motherboard by TVS diodes), all we care about is boosting CLK, DATA and HPD lines from 3.3V to 5V and getting 5V OUT on Pin 18 of HDMI port.
Difficulty: Advanced
Parts required: 1. HDMI2C1-6C1 chip. 2. QFN-16 breakout board or similar board capable of handling QFN-18 chip with 0.5mm pitch. 3. 0.1uF 10V (or 16V) 0402 capacitor and two 1.8k resistors. 4. Optional: Power Switch IC (found on PS4 board for 5V OUT/Pin 18 of HDMI port).
STEP 1. Prep: A) Secure HDMI2C1-6C1 chip to the breakout board with Pin 1 (FAULT) and Pin 14 (VDD_CEC) of the chip floating and not connected. B) On the breakout board: solder one side of the 1.8k resistors to the SDA and SCL points and link the other side of the resistors to the 5V_OUT rail. C) on the motherboard: replace C14 (for 5V_OUT) with 0.1uF 10V capacitor. D) link SCL_IC (E4) to R_SCL_IC (E5) and SDA_IC (E2) to R_SDA_IC (D5).
STEP 2. (OPTIONAL) HDMI2C1-6C1 chip is enabled as soon as VDD_5V comes in (which is a standby rail and always on when AC cord is plugged in to the power supply), so even if the system is not turned on - you will be getting 5V on Pin 18 (5V_OUT) of the HDMI port, and your TV will be constantly getting power and searching/awaiting video signal when the system is off. To remedy this - use Power Switch IC and wire it according to the diagram, this way our new VDD_5V will come in only when HDD is on.
STEP 3. Wire the motherboard to the breakout board (the way the chip is placed on the breakout board, the following pinout will be used: New TP1 is CEC_IC and TP16 is VDD_IC). Connect combined SDA_IC (E2/D5) to TP3, combined SCL_IC (E4/E5) to TP2, HPD_IC (B5) to TP4, HPD (A1) to TP8, SDA (C1) to TP9, SCL (D2) to TP 10, 5V_OUT (A3) to TP13, new VDD_5V to TP14, VDD_IC to TP16, and link TP11 to GND.
This guide is for Xbox One X motherboard, but obviously can be easily applied to Xbox Series S and X systems as well.
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Materia_tofu:
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SylverReZ:
@Materia_tofu, Mushrooms are an hallucinogenic drug, explains why Mario's adventures are all dreams.