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Power supply LEDs

This topic provides information about various power supply LED status and corresponding action suggestions.

The following minimal configuration is required for the server to start:

  • System board
  • Two processors
  • Sixteen memory modules
  • System I/O board and its cable (for firmware and RoT security module)
  • Eight power supplies
  • One M.2 drive (If OS is needed by debugging)
  • Twenty-one system fans
  • One front PCIe Ethernet Adapter (If network is required)

The following table describes the problems that are indicated by various combinations of the power supply LEDs and the power-on LED and suggested actions to correct the detected problems.

Figure 1. Power supply LEDs
Power supply LEDs
LEDDescription
1 Output and fault status (bi-color, green and yellow)
The output and fault status LED can be in one of the following states:

  • Off: The server is powered off, or the power supply unit is not working properly. If the server is powered on but the LED is off, replace the power supply unit.

  • Fast blinking green (about five flashes per second): The power supply unit is in firmware update mode.

  • Green: The server is on and the power supply unit is working normally.

  • Yellow: The power supply unit may have failed. Dump the FFDC log from the system and contact Lenovo back-end support team for PSU data log reviewing.

2 Input status (single color, green)
The input status LED can be in one of the following states:

  • Off: The power supply unit is disconnected from the input power source.

  • Green: The power supply unit is connected to the input power source.

  • Blinking (1Hz): The input power is unhealthy.