Xbox 360



''This page applies to the Phat (Xenon, Zephyr, Falcon, Jasper) and Slim (Trinity, Corona, Winchester) models. '' The Xbox 360 uses a grid layout system with letters and numbers to identify parts. For example, U4D1, the GPU, is an IC in section 4D. See the edges of the board for the sections, they are printed on.

No Power
Board is unresponsive to power button.

Undo Bad Writes/Check For Faulty NAND


 * The board cannot power on if it cannot load a valid SMC and config from the NAND flash
 * Read NAND and check that the dump is valid
 * If you cannot get valid flash config, continue to next step
 * Replace NAND if flashing a valid image does not yield a valid read
 * Some 4GB Coronas may have a faulty Phison (V2) or eMMC (V4/V6) chip, they must be replaced or downgraded to 16MB
 * This is a common fault, where the controller wears out with extended use of the internal 4GB MU
 * Usually the system will stop saving settings or updating before going completely dead due to controller degradation
 * Can be diagnosed by attempting read/write

Standby Power Rails


 * Check power rails in the following order:

Missing V_5P0STBY:
 * This rail comes directly from the PSU. Check DC jack:
 * Phat: J9A1 Pin 8
 * Slim: J7A1 Pin 10
 * Check for shorted filtering caps for V_5P0STBY:
 * Phat: C5B7, C8B1, C9A4
 * Slim: C6A1, C6A4, C6A5

Missing V_5P0DUAL:
 * This rail comes from either V_5P0 or V_5P0STBY, depending on VREG_V5P0_SEL
 * Check regulator pins 5-8 for 5 volts:
 * Phat: U1R1
 * Slim: U1B1
 * Check front and rear USB port pins are not shorted or damaged
 * Check VREG_V5P0_SEL is high (so that V_5P0DUAL will be created from V_5P0STBY)
 * Phat: FT1R1
 * Trinity: FT1P1
 * Corona/Winchester: FT2R1
 * Check 4.75K Ohm resistor:
 * Phat: R1D6
 * Slim: R1P1
 * If VREG_V5P0_SEL is still missing, replace Southbridge:
 * Phat: U2C1
 * Slim: U3D1

Missing V_3P3STBY:
 * Phat:
 * If U5B1 circuit is present:
 * Check U5B1 regulator for shorts, NCP1117 or compatible
 * Check C5B1, C5B2 for shorts
 * If U9C1 circuit is present (Some Phat Jasper Kronos only)
 * Some boards use this different circuit, manufacturer choice, U5B1 circuit will not be present
 * Check U9C1 regulator for shorts
 * Check R9C5: 0 Ohms
 * Check C9C8, C9C10 for shorts
 * Trinity:
 * Check U5A1 regulator for shorts
 * Check R5A11: 0 Ohms
 * Check C5A1, C5A2, C5A3 for shorts
 * Corona/Winchester:
 * Check U5A1 regulator for shorts
 * Check R5A8, R5A12: 0 Ohms
 * Check C5A1, C5A2, C5A3 for shorts

Missing V_1P8STBY:
 * Phat:
 * If U5B2 circuit is present:
 * Check U5B2 regulator for shorts, NCP1117 or compatible
 * Check C5B4, C5B6 for shorts
 * If U9D1 circuit is present (Some Phat Jasper Kronos only)
 * Some boards use this different circuit, manufacturer choice, U5B2 circuit will not be present
 * Check U9D1 regulator for shorts
 * Check R9D4: 0 Ohms
 * Check C9D5, C9D9, C9D10, C9D11 for shorts
 * Trinity:
 * Check U5B1 regulator for shorts
 * Check R5B4: 0 Ohms
 * Check C5B1, C5B2, C5B6, C5B7 for shorts
 * Corona/Winchester: TBD

Missing V_1P2STBY:
 * This rail exists only on Corona/Winchester
 * Check U5A2 regulator for shorts
 * Check R5B4, R5A13: 0 Ohms
 * Check C5A9, C5B1, C5B2, C5B3, C5B7 for shorts

Standby Clock


 * STBY_CLK is created by the ANA/HANA and is used to run the System Management Controller (8051 core) in the Southbridge
 * Phat/Trinity:
 * Check STBY_CLK for 48 MHz single-ended clock:
 * Phat: FT2R2
 * Trinity: FT3N2
 * If bad/missing signal:
 * Check master crystal Y3B1 for 27 MHz single-ended clock
 * Check STBY_CLK resistor for 33 Ohms:
 * Xenon: R3B7
 * Zephyr, Falcon, Jasper: R4B24
 * Trinity: R3B15
 * Replace clockgen chip:
 * Xenon: Cypress CY28517 U3B4
 * Zephyr, Falcon, Jasper: HANA U4C2
 * Trinity: HANA U3B1
 * Corona/Winchester:
 * These boards do not have a STBY_CLK signal as the clockgen was integrated with the Southbridge (KSB), it is generated internally
 * Check master crystal Y3D1 for 25 MHz single-ended clock
 * This is as far as we can check STBY_CLK circuit on these boards

SMC Reset


 * SMC_RST_N must go high in order for the SMC to run
 * It is controlled by ANA/HANA (integrated in Southbridge for Corona/Winchester)
 * Check that SMC_RST_N goes high (>1V, usually 3.3V)
 * Phat: J2B1 Pin 5
 * Slim: J2C3 Pin 5
 * Corona/Winchester: If R2C10 is missing, check R2C10 S Pad instead, resistor is not needed
 * If missing signal:
 * Xenon: Replace ANA U4C2
 * Zephyr, Falcon, Jasper: Replace HANA U4C2
 * Trinity: Replace HANA U3B1
 * Corona/Winchester: Replace Southbridge U3D1

Southbridge


 * If all else fails, Southbridge is bad and must be replaced:
 * Phat: U2C1
 * Slim: U3D1

Red Ring of Death
The Xbox 360 was plagued with problems during the first half of its life. Red Ring of Death also known as RRoD was an issue everyone has run into at some point. In order to diagnose the error of your console, when you see your Red Ring of Death or RRoD. You need to hold down the sync button and press eject 4 times. Each time you press eject you will be greeted with multiple quadrants that flash red (green on Slim consoles).

4 lights signify 0. 1 lights signify 1. 2 lights signify 2. 3 lights signify 3.

After pressing it 4 times, you will have a code that helps you diagnose your problem below. As example, seeing 4 lights flash 3 times then seeing 1 light flash means you have:

0001 ERROR_V_12P0 which means your solution is most likely to replace your power supply and to test and replace MOSFETs, caps, and controller chip on V_12P0 rail

Schematics
Schematics for Xenon, Zephyr, Falcon, Jasper, Trinity, and Corona can be found here.