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  1. #1
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    Xbox 360 ODD And HDD Boot problems

    No Boot from ODD

    • Check lines between SB and J1C1
    • Measure resistance on the following caps on SB side (positive probe to GND)

    Signal------------------------Ref. Des.----------------Value
    ODD_RX_DP-----------------C1C3--------------------0.7MΩ
    ODD_RX_DN-----------------C1C4-------------------0.7MΩ
    ODD_TX_DN-----------------C1C5------------------ 7KΩ
    ODD_TX_DP-----------------C1C6------------------7KΩ

    • If the resistance on each cap is ok then replace U2C1

    No Boot from HDD

    •Check voltages on RT1R1 & R1U1 for 5v
    • Check lines between SB and J1E1
    • Measure resistance on the following caps

    Signal--------------------------------Ref. Des.----------------Value
    HDD_RX_DP--------------------------C1E1--------------------Pin 2 = 16KΩ, pin 1 = 1.3MΩ
    HDD_RX_DN-------------------------C1E2---------------------Pin 2 = 16KΩ, pin 1 = 1.3MΩ
    HDD_TX_DN-------------------------C1E3---------------------Pin 2 = 38KΩ, pin 1 = 7KΩ
    HDD_TX_DP-------------------------C1E4---------------------Pin 2 = 38KΩ, pin 1 = 7KΩ

    Note: Do measures with positive probe to GND, pin 2 of each cap is on the connector side.

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    If the resistance on each cap is ok then replace U2C1

    No Boot

    • If the board doesn’t show a front panel error code:
    1. Check if the LAN is working, replace U1B1 as necesary
    2. Replace U2E1 as a first repair,
    3. If the failure is still present replace U2C1
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