Repair Actions/0001

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

ERROR_V12P0

ANA_V12P0_PWRGD is driven high by the ANA (later HANA) 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 to localize short
  • CPU VREG
  • GPU VREG (Not on Xbox 360 S/E)
  • V_5P0 VREG
  • V_12P0 Bleeder

PSU Enable and Power Good

• Check PSU_V12P0_EN signal components
  • If components are fine but the signal is missing, replace Southbridge
• Check 12V on DC jack
  • If missing, replace PSU
• Check ANA_V12P0_PWRGD/V12P0_PWRGD
  • If missing, check V_12P0_DET circuit
  • If V_12P0_DET is fine but the signal is missing, replace ANA/HANA