Xbox 360 SMC Error: 0022


CPU did not send GetPowerUpCause to SMC

This means the CPU did not handshake with the SMC to get the real time clock info.
If the RROD takes about 27 seconds to appear, it is most likely a software issue (CPU Key or LDV mismatch).

  1. Undo Bad Writes
    • If you had a bad flash/failed update on the NAND, this could be why you have 0022 now
    • If you wrote to the NAND, it could be a mismatch of the CPU Key or LDVs in the NAND image
    • In either case:
      • Boot XeLL to grab the CPU Key and LDVs and rebuild the image

  2. CPU Reset
    • CPU_RST_N must go high in order for the CPU to run
    • It is controlled by the Southbridge
    • Check that CPU_RST_N goes high (>1V, usually 3.3V)
      • Phat: J8C1 pin 2 (Check R8C2: 1K Ohms or signal may be missing)
      • Trinity: FT4R2 (Check R4D4: 1K Ohms or signal may be missing)
      • Corona/Winchester: R4P5 S Pad (Further from the hole in the board)
    • If missing signal, replace Southbridge:
      • Phat: U2C1
      • Slim: U3D1

  3. CPU Clock
    • Check junction between the sets of 33 and 49.9 Ohm resistors for proper 100 MHz differential clock
    • If bad/missing signal, check the values of the resistors as follows:
      • Xenon:
        • Check R3C11 and R3C12: 33 Ohms
        • Check R3C17 and R3C18: 49.9 Ohms
      • Zephyr, Falcon, Jasper:
        • Check R4C11 and R4C12: 33 Ohms
        • Check R4C9 and R4C10: 49.9 Ohms
      • Trinity:
        • Check R3C5 and R3C6: 33 Ohms
        • Check R3C9 and R3C10: 49.9 Ohms
      • Corona/Winchester:
        • Check R3D3 and R3D5: 33 Ohms
        • Check R3D4 and R3D14: 49.9 Ohms
    • If still bad/missing clock signal, replace clockgen chip:
      • Xenon: Cypress CY28517 U3B4
      • Zephyr, Falcon, Jasper: HANA U4C2
      • Trinity: HANA U3B1
      • Corona/Winchester: Southbridge U3D1

  4. CPU PLL Bypass
    • CPU_PLL_BYPASS is part of the CPU's clock multipliers
    • If circuit not correct, CPU might get stuck slow and never speed up resulting in handshake taking FAR too long
    • Commonly damaged by poor soldering skills
    • Phat:
      • Check R7R17: 10K Ohms
      • Check connection from north side of resistor to the unlabelled CPU_PLL_BYPASS pad/via immediately above
    • Slim: TBD, circuit is unknown as of now
    • Check that CPU_PLL_BYPASS is not shorted to ground
      • If it is, the CPU is faulty and must be replaced:
        • Phat: U7D1
        • Slim: U5E1

  5. CPU
    • If all else fails, CPU is bad and must be replaced:
      • Phat: U7D1
      • Slim: U5E1