Raspberry Pi Status LEDs Explained

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All Raspberry Pi boards have status LEDs positioned in one corner next to the 3.5mm audio jack and USB port(s).

The Model B has five status LEDs whereas the Model A has two. The Model A has PCB labels for all the LEDs but the three network related LEDs are not populated.

The following photo shows the five status LEDs on a Raspberry Pi Model B Rev 2.0 board (Note the mounting hole not present on the original Model B Rev 1.0 devices).

Raspberry Pi Status LEDs

Raspberry Pi Status LEDs

Revision 1.0 Boards (Model B) labels are :

  • OK
  • PWR
  • FDX
  • LINK
  • 10M

Revision 2.0 Board (Model A & Model B) labels are :

  • ACT
  • PWR
  • FDX
  • LNK
  • 100

The LEDs have the following meanings :

  • ACT – D5 (Green) – SD Card Access
  • PWR – D6 (Red) – 3.3 V Power is present
  • FDX – D7 (Green) – Full Duplex (LAN) connected
  • LNK – D8(Green) – Link/Activity (LAN)
  • 100 – D9(Yellow) – 100Mbit (LAN) connected
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4 Comments

    • Yes. “10M” was simply a mistake and always should have been “100”. They had to wait until they tweaked the board for other reasons before it was worth correcting.

  1. Raspberry PI 3 Model B has 2 LEDs on the board one red one green and two on the wired ethernet connection, one yellow and one green.

    They don’t seem to be clearly labelled, but the green one on the board might be something to do with SDcard access. The red one looks like it might be power but not sure what it means when it starts flashing.

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