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Hardware/Diagnostics and Repair (view source)
Revision as of 03:52, 20 April 2023
, 03:52, 20 April 2023Created page with "== Early Boot Failures == {| class="wikitable" |- ! LED behavior ! Notes |- | Front panel LED blinks red.<br/>The back fan is not spinning.<br/>SoC voltage rails are inactive..."
== Early Boot Failures ==
{| class="wikitable"
|-
! LED behavior
! Notes
|-
| Front panel LED blinks red.<br/>The back fan is not spinning.<br/>SoC voltage rails are inactive.
| The power regulators' PGOOD signal tripped, and the SMC turned off the regulators.
|-
| Front panel LED stays red after pressing Power/Eject.<br/>The back fan is not spinning.<br/>SoC voltage rails are active.
| [[boot0]] failure. The specific error code will blink on [[Hardware/Latte_GPIOs|NDEV_LED]], however this usually means that the copy of [[boot1]] in [[Hardware/TSOP_NAND|NAND]] is corrupt.
|-
| Front panel LED blinks blue.<br/>The back fan is spinning.
| [[boot1]] failure. The specific error code will blink on [[Hardware/Latte_GPIOs|NDEV_LED]].<br/>This may mean that the filesystem on [[Hardware/TSOP_NAND|SLC NAND]] is corrupt, however it could also mean that the RTC failed to read, DRAM failed to initialize (which can also be caused by RTC failures, since it stores a semi-warmboot flag), IOSU's fw.img is corrupt/failed signature checks/doesn't exist, etc.
|-
| Front panel LED is solid blue.<br/>The back fan is spinning.
| [[boot1]] loaded, verified and jump to [[IOSU]]. IOSU might not show an error code.
|-
|}
{| class="wikitable"
|-
! LED behavior
! Notes
|-
| Front panel LED blinks red.<br/>The back fan is not spinning.<br/>SoC voltage rails are inactive.
| The power regulators' PGOOD signal tripped, and the SMC turned off the regulators.
|-
| Front panel LED stays red after pressing Power/Eject.<br/>The back fan is not spinning.<br/>SoC voltage rails are active.
| [[boot0]] failure. The specific error code will blink on [[Hardware/Latte_GPIOs|NDEV_LED]], however this usually means that the copy of [[boot1]] in [[Hardware/TSOP_NAND|NAND]] is corrupt.
|-
| Front panel LED blinks blue.<br/>The back fan is spinning.
| [[boot1]] failure. The specific error code will blink on [[Hardware/Latte_GPIOs|NDEV_LED]].<br/>This may mean that the filesystem on [[Hardware/TSOP_NAND|SLC NAND]] is corrupt, however it could also mean that the RTC failed to read, DRAM failed to initialize (which can also be caused by RTC failures, since it stores a semi-warmboot flag), IOSU's fw.img is corrupt/failed signature checks/doesn't exist, etc.
|-
| Front panel LED is solid blue.<br/>The back fan is spinning.
| [[boot1]] loaded, verified and jump to [[IOSU]]. IOSU might not show an error code.
|-
|}