Repair Actions/0002

See also: Errors and Secondary Error Codes

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

ERROR_V_CPUCORE

VREG_CPU_PWRGD is driven high by the V_CPUCORE controller as long as the rail is within tolerance. If V_CPUCORE ever drops out of tolerance, the signal is de-asserted, causing the SMC to enter EC_FATAL and the 0002 code to be displayed on the front panel.

Short Circuit

• Check if V_CPUCORE is shorted
• If it is, check each phase to localize short
  • Lift at least 1 pin of the inductors to isolate sections before checking
  • 3 phases on Xenon, Zephyr, and Elpis
  • 2 phases on Falcon, Jasper, and Tonasket
• Check V_CPUCORE decoupling capacitors near and under CPU
• If all components are fine but the short remains, replace the CPU

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_CPU_EN signal and pulldown
  • If pulldown is fine but signal is missing, replace Southbridge
• Check VREG_CPU_PWRGD (VREG_CPUCORE_VCS_PWRGD on Xbox 360 S/E motherboards)
  • If present, replace Southbridge
  • If missing, check pullup
    • On Original Xbox 360 motherboards, check V_5P0
    • 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_CPUCORE voltage is within tolerance
• If it is, replace the PWM driver and recheck PWRGD
• If it isn't, check each VREG phase and PWM driver
  • 3 phases on Xenon, Zephyr, and Elpis
  • 2 phases on every other board