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No Power: Board is unresponsive to power button

1. 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


2. Standby Power Rails
• Check power rails in the following order:

Power Rail	Source	Location: Phat	Location: Trinity	Location: Corona/Winch
V_5P0STBY	Standby 5V directly from PSU	FT8N1	FT6M1	FT6M1
V_5P0DUAL	5V, switched between V_5P0STBY and V_5P0	FT1R2	FT1N9	FT1N9
V_3P3STBY	3.3V, created from V_5P0STBY	FT5N1	FT5M1	DB5A2
V_1P8STBY	1.8V, created from V_5P0STBY	FT5N2	FT5N2	R3R2 either pad
V_1P2STBY	1.2V, created from V_5P0STBY	N/A	N/A	DB3C2

• 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 C5B1, C5B2 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


3. 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 Y3B1 for 25 MHz single-ended clock
• This is as far as we can check STBY_CLK circuit on these boards


4. 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


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

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System Management Controller (SMC) Errors
Code	Name	Explanation	Possible Repair Actions
0001	ERROR_V_12P0	ANA_V12P0_PWRGD negated unexpectedly	Replace Power Supply, Test and replace MOSFETs, caps, and controller chip on V_12P0 rail
0002	ERROR_V_CPUCORE	VREG_CPU_PWRGD negated unexpectedly	Replace Power Supply, Test and replace MOSFETs, caps, and controller chip on V_CPUCORE rail
0003	ERROR_V_GPUCORE	VREG_GPU_PWRGD negated unexpectedly	Replace Power Supply, Test and replace MOSFETs, caps, and controller chip on V_GPUCORE rail
0010	ERROR_NO_HANA ERROR_NO_ANA	HANA/ANA is not responding to reads or writes	Replace HANA/ANA or Southbridge
0011	ERROR_THERMAL_CPU	CPU temperature overload	Detailed Diagnostic/Repair Actions
0012	ERROR_THERMAL_GPU	GPU temperature overload	Detailed Diagnostic/Repair Actions
0013	ERROR_THERMAL_EDRAM	eDRAM temperature overload	Detailed Diagnostic/Repair Actions
0020	ERROR_GPU_RST_DONE	GPU_RST_DONE signal missing after seqUnReset time passed	Replace GPU
0021	ERROR_NO_PCIE	PCIE link did not enter L0 after seqUnReset time passed	Detailed Diagnostic/Repair Actions
0022	ERROR_NO_HANDSHAKE	CPU did not send GetPowerUpCause to SMC	Detailed Diagnostic/Repair Actions
0023	ERROR_NO_CLOCKCHIP	Xenon: ANA_BCKUP is not responding to reads or writes Others: Unknown error related to clockchip	Xenon: Replace ANA_BCKUP, ANA, or Southbridge Zephyr, Falcon, Jasper: Replace HANA Trinity: Replace C4E3 cap, replace HANA Corona: Replace C4E3 cap, replace Southbridge
0030	ERROR_NO_TEMPERATURES	HANA/ANA temperature registers read as zero	Check for shorted resistors, replace HANA/ANA
0031	Unknown	V_3P0 and V_5P0 related	Check V_3P0 and V_5P0 circuits, and all its resistors and capacitors
0032	Unknown	CPU Power related	Check V_CPUVCS circuit, and all its resistors, capacitors, and other parts
0033	Unknown	Unknown	Unknown

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Xbox System Software (XSS) Errors
Code	Name	Explanation	Possible Repair Actions
0100 E 16	ERROR_NBINIT_MEM_VENDOR_ID	RAM Vendor ID wrong, or not detected	Replace GPU or RAM
0101 E 17	ERROR_NBINIT_MEM_READ _STROBE_DATA_WRITE	Could not write data for RAM read strobe training	Replace GPU or RAM
0102 E 18	ERROR_NBINIT_MEM_READ _STROBE_DELAY_TRAINING	Memory read strobe delay training failed	Replace GPU or RAM
0103 E 19	ERROR_NBINIT_MEM_WRITE _STROBE_DELAY_TRAINING	Memory write strobe delay training failed	Replace GPU or RAM
0110 E 20	ERROR_MEMORY_ADDRESSING	Memory address line failed or unresponsive	Replace GPU or RAM
0111 E 21	ERROR_MEMORY_DATA	Memory data line failed or unresponsive	Replace GPU or RAM
0300 E 48	ERROR_MFG_COMM_FAILURE	Unknown	Unknown
0301 E 49	ERROR_MFG_UNABLE_TO _CONNECT	Unknown	Unknown
0302 E 50	ERROR_MFG_CONNECTX _FAILURE	Unknown	Unknown
0303 E 51	ERROR_MFG_GATEWAY_ERROR	Unknown	Unknown
0310 E 52	ERROR_MFG_BAD_RESPONSE _DATA	Unknown	Unknown
0311 E 53	ERROR_MFG_CHALLENGE _REFUSED	Unknown	Unknown
0312 E 54	ERROR_MFG_BAD_VAULT	Unknown	Unknown
0313	ERROR_XSS_MANUF_TEST	Manually triggered error code	Unknown
1000 E 64	ERROR_XSS_CDROM_TIMED _OUT	Kernel DVD drive communications timed out	Replace SATA cable to DVD drive, replace DVD drive PCB, replace Southbridge
1001 E 65	ERROR_XSS_CDROM_NOT _DMA_CONFIGURED	Kernel could not configure DVD drive for DMA mode	Replace SATA cable to DVD drive, replace DVD drive PCB, replace Southbridge
1002 E 66	ERROR_XSS_CDROM_COULD _NOT_CREATE_DEVICE	Kernel could not create DVD drive instance	Replace SATA cable to DVD drive, replace DVD drive PCB, replace Southbridge
1003 E 67	ERROR_XSS_HDD_TIMED_OUT	Kernel HDD communications timed out	Replace HDD, replace HDD port/cable, replace Southbridge
1010 E 68	ERROR_XSS_HDD_NOT_DMA _CONFIGURED	Kernel could not configure HDD for DMA mode	Replace HDD, replace HDD port/cable, replace Southbridge
1011 E 69	ERROR_XSS_HDD_COULD_NOT _CREATE_DEVICE	Kernel could not create HDD instance	Replace HDD, replace HDD port/cable, replace Southbridge
1012 E 70	ERROR_XSS_HDD_NOT_FOUND	Kernel couldn't find HDD Note: This error does not show up because a HDD is missing, it shows up when a HDD is detected, but can't be found	Replace HDD, replace HDD port/cable, replace Southbridge
1013 E 71	ERROR_XSS_XAM_NO_DASH	XAM could not find dash.xex on flash	Unplug HDD, if error clears, format or replace HDD, else Rebuild and reflash NAND
1020 E 72	ERROR_SMC_FLASH_CONFIG _CORRUPT	SMC configuration corrupt	Rebuild and reflash NAND
1021 E 73	ERROR_HSIO_TRAINING _FAILED	GPU to eDRAM High Speed Link failed, eDRAM faulty or unresponsive	Replace GPU
1022 E 74	ERROR_HSIO_CALIBRATION _FAILED	GPU to eDRAM High Speed Link failed, eDRAM faulty or unresponsive	Replace GPU
1023 E 75	ERROR_UNEXPECTED _ETHERNET_PHY_VENDOR	Southbridge could not communicate with Ethernet PHY over MDIO/MDC	Replace Ethernet chip, replace Southbridge
1030 E 76	ERROR_ETHERNET_PHY_RESET _FAIL	Ethernet PHY failed to reset correctly or complete reset	Replace Ethernet chip
1031 E 77	ERROR_ETHERNET_PHY_READ _WRITE_FAIL	Could not read or write to Ethernet PHY	Replace Ethernet chip
1032 E 78	ERROR_UNSUPPORTED_GPU	GPU is down revision, not supported on this board	Replace GPU with correct revision for board
1033 E 79	ERROR_XSS_FLASH_NO_XAM	xam.xex not found on flash	Unplug HDD, if error clears, format or replace HDD, else Rebuild and reflash NAND
1100 E 80	Unknown	NAND LDV does not match eFUSE	Rebuild NAND with correct LDV Phat: Check value of R6T3 resistor
1101 E 81	Unknown	Unknown/Update related?	Unknown/Rebuild NAND?
1102 E 82	Unknown	Unknown/eDRAM/HSIO related?	Unknown/Replace GPU?

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Bootloader Errors: XeDK/XDK only
Code	Name	Explanation	Possible Repair Actions
2123	ERROR_POST_2BL_E_VERIFY _SECOTP_1	2BL fusecheck: first fuseline mismatch	Unknown
2130	ERROR_POST_2BL_E_VERIFY _SECOTP_2	2BL fusecheck: first fuseline mismatch	Unknown
2131	ERROR_POST_2BL_E_VERIFY _SECOTP_3	2BL fusecheck: second fuseline mismatch	Unknown
2132	ERROR_POST_2BL_E_VERIFY _SECOTP_4	2BL fusecheck: second fuseline mismatch	Unknown
2133	ERROR_POST_2BL_E_VERIFY _SECOTP_5	2BL fusecheck: second fuseline mismatch	Unknown
2200	ERROR_POST_2BL_E_VERIFY _SECOTP_6	2BL fusecheck: fuse LDV is greater than bootloader LDV	Unknown
2201	ERROR_POST_2BL_E_VERIFY _SECOTP_7	2BL fusecheck: CPU Key invalid	Unknown
2202	ERROR_POST_2BL_E_VERIFY _SECOTP_8	2BL fusecheck: pairing data mismatch	Unknown
2203	ERROR_POST_2BL_E_VERIFY _SECOTP_9	2BL fusecheck: pairing data mismatch	Unknown
2211	ERROR_POST_2BL_E_VERIFY _OFFSET_3BL	Signature of 3BL offset is invalid	Unknown
2212	ERROR_POST_2BL_E_LOCATE _3BL	3BL is not in the correct place on the NAND	Unknown
2213	ERROR_POST_2BL_E_VERIFY _HEADER_3BL	Signature of 3BL header is invalid	Unknown
2220	ERROR_POST_2BL_E_SIG _VERIFY_3BL	Signature of 3BL is invalid	Unknown
2221	ERROR_POST_2BL_E_HWINIT	Unknown	Unknown
2222	ERROR_POST_2BL_E_VERIFY _OFFSET_4BL	Signature of 4BL offset is invalid	Unknown
2223	ERROR_POST_2BL_E_VERIFY _HEADER_4BL	Signature of 4BL header is invalid	Unknown
2230	ERROR_POST_2BL_E_SIG _VERIFY_4BL	Signature of 4BL is invalid	Unknown
2231	ERROR_POST_2BL_E_SHA _VERIFY_4BL	SHA of 4BL is invalid	Unknown
2232	ERROR_POST_2BL_E _UNEXPECTED_INTERRUPT	Processor issued non-RESET interrupt during boot chain	Unknown
2301	ERROR_POST_4BL_E_VERIFY _OFFSET	Signature of CF or Kernel/Hypervisor patch offsets are invalid	Unknown
2211	ERROR_POST_4BL_E_VERIFY _HEADER	Signature of CF or Kernel/Hypervisor patch headers are invalid	Unknown
2303	ERROR_POST_4BL_E_SHA _VERIFY	SHA of CF or Kernel/Hypervisor patches is invalid	Unknown
2310	ERROR_POST_4BL_E_LZX _EXPAND	Unknown	Unknown
2311	ERROR_POST_4BL_E_LOAD _6BL	Unknown	Unknown