View source for Repair Actions/No Power

{{See also|Errors|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