Repair Actions/No Power

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.

If the Xbox 360 is unresponsive to the power button, the board is died-died.

Standby Power Rails

V_5P0STBY

• Check if V_5P0STBY is present
• If missing, check if V_5P0STBY is shorted
  • If it is, check decoupling capacitors and V_5P0DUAL circuit
• This rail comes directly from the power supply
• Check 5V on DC jack
  • If missing, check DC jack

V_3P3STBY

• Check if V_3P3STBY is present
• If missing, check if V_3P3STBY is shorted
  • If it is, check the regulator and decoupling capacitors
• Check circuit components
• Replace the regulator

V_1P8STBY

• This rail is not present on Corona, Waitsburg, Stingray, and Winchester
• Check if V_1P8STBY is present
• If missing, check if V_1P8STBY is shorted
  • If it is, check the regulator and decoupling capacitors
• Check circuit components
• Replace the regulator

V_1P2STBY

• This rail is only present on Corona, Waitsburg, Stingray, and Winchester
• Check if V_1P2STBY is present
• If missing, check if V_1P2STBY is shorted
  • If it is, check the regulator and decoupling capacitors
• Check circuit components
• Replace the regulator

V_5P0DUAL

• Only check this rail if all above rails are present
• Check if V_5P0DUAL is present
• If missing, check if V_5P0DUAL is shorted
  • If it is, check the regulator and USB ports
• Check if VREG_V5P0_SEL is high
  • If it is, check regulator input resistors
    • If resistors are fine, replace the regulator
  • If low, SMC is not alive, continue below

Standby Clock

• Xenon, Zephyr, Falcon, Jasper, Tonasket, and Trinity
  • Check STBY_CLK for 48 MHz clock signal
  • If bad/missing signal, check crystal for 27 MHz
  • Check STBY_CLK series resistor
  • Replace clock generator (Cypress or HANA)
• Corona, Waitsburg, Stingray, and Winchester
  • It is not possible to check STBY_CLK
  • Check crystal 25 MHz