All LEDs on the front panel of the switch were not glowing since first use, even though the device itself was fully functional. The LEDs remained OFF throughout the entire boot process even after power cycling.

2. Symptoms

3. Commands Used

Basic Verification Commands

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show platform firmware status

Diag Mode — I2C Initialization

Device was power-cycled and booted into Diag mode (GRUB → DIAG: Accton Diagnostic). 

The following I2C commands were then executed:

i2cset -y 0 0x77 0x01

i2cset -y 0 0x71 0x02

Read LED Register Values

i2cget -y 0 0x60 0x21

i2cget -y 0 0x60 0x22

i2cget -y 0 0x60 0x23

i2cget -y 0 0x60 0x24

i2cget -y 0 0x60 0x25

Force LEDs to Light Up Green (Write Operations)

After executing the write commands below, the five system LEDs were forced to light up green:

i2cset -y 0 0x60 0x21 0x05

i2cset -y 0 0x60 0x22 0x05

i2cset -y 0 0x60 0x23 0x05

i2cset -y 0 0x60 0x24 0x05

i2cset -y 0 0x60 0x25 0x05

4. Root Cause

The LED controller on the device did not initialize correctly during the initial boot sequence. This caused all system LEDs to remain in an unlit state despite the device being otherwise fully operational. The root cause is a firmware/hardware initialization failure of the LED controller at startup.

Note: If the LEDs do not respond to the I2C write commands or a power cycle, it would indicate a hardware failure and an RMA (Return Merchandise Authorization) would be required.

5. Resolution

Primary Fix (Recommended first step):

Alternative Fix (via Diag Mode):

If a power cycle alone does not resolve the issue, boot into Diag mode and run the I2C commands listed in Section 3 to force the LED controller to reinitialize and light up the LEDs green.

Verification: