Repair Actions/0001
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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_12P0
ANA_V12P0_PWRGD is driven high by the ANA (later HANA and eventually KSB) as long as the V_12P0 rail is within tolerance. If V_12P0 ever drops out of tolerance, the signal is de-asserted, causing the SMC to enter EC_FATAL and the 0001 code to be displayed on the front panel.
Short Circuit
- Check if V_12P0 is shorted
- If it is, check circuit sections input side to localize short
- Lift at least 1 pin of the inductors to isolate sections before checking
- CPU VREG
- GPU VREG (Not on Xbox 360 S/E motherboards)
- V_5P0 VREG
- Also responsible for V_1P8 on the Original Xbox 360 motherboards, V_3P3 on Xbox 360 S/E motherboards
- V_12P0 Bleeder
PSU Enable and Power Good
- Everything in this section must be checked quickly, as the SMC will shut down power upon entering EC_FATAL
- Check PSU_V12P0_EN signal components
- If components are fine but the signal is missing, replace Southbridge
- Check 12V on DC jack
- If missing, check DC jack
- Check ANA_V12P0_PWRGD (V12P0_PWRGD on Corona and Winchester)
- If present, replace Southbridge
- If missing, check V_12P0_DET circuit
- If V_12P0_DET is fine, but the signal is missing, replace ANA/HANA/KSB