Raspberry Pi Status LEDs Explained

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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2 Responses to Raspberry Pi Status LEDs Explained

  1. Brian G says:

    So OK is same as ACT and 10M is same as 100, just labelled sttangely?

    • Matt says:

      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.

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