Repair Actions/0033

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Note  This page is a technician's reference and is not intended to teach diagnosis and repair of electronic circuits.

This error only exists on the Xbox 360 S and Xbox 360 E.

ERROR_V_MEM

VREG_VMEM_PWRGD is driven high by the V_MEM controller as long as the rail is within tolerance. If V_MEM ever drops out of tolerance, the signal is de-asserted, causing the SMC to enter EC_FATAL and the 0033 code to be displayed on the front panel.

Short Circuit

  • Check if V_MEM is shorted
  • If it is, check circuit components to localize short
    • Lift at least 1 pin of the inductor to isolate the rail before checking

Enable and Power Good

  • Everything in this section must be checked quickly, as the SMC will shut down power upon entering EC_FATAL
  • Check VREG_VMEM_EN signal and pulldown
    • If pulldown is fine but signal is missing, replace Southbridge
  • Check VREG_VMEM_PWRGD
    • If present, replace Southbridge
    • If missing, check pullup
      • If pullup is fine, continue below

VREG Circuit

  • Everything in this section must be checked quickly, as the SMC will shut down power upon entering EC_FATAL
  • Check if V_MEM voltage is within tolerance
  • If it is, replace the PWM driver and recheck PWRGD
  • If it isn't, check VREG and PWM driver