Repair Actions/0002
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| 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 is present
- 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 Falcon, Jasper, and Tonasket