stopped working

[Serj Derugin]

Hello, I bought it on January 14, 2026. There were no problems until yesterday. It worked in the evening. When I turned it on in the morning, it didn't connect in the program. The two outer LEDs were just blinking. The indicators on the network connector weren't lit. I checked the patch cord, reset it to factory settings, connected it directly to the computer, tried it with the router, nothing changed. Please help me figure this out.

[Serj Derugin]

Subject: Network connection issue with L829-1J1T-43 jack / LEDs D4-D5 state

Hi everyone,

My case is very similar to the issue described in this thread: https://groups.google.com/g/hermes-lite/c/cRClwQQEZvE

This issue just happened out of nowhere when I powered on the device in the morning.

Here is my current LED status:

• D2 is flashing (at a normal rate)
• D3 is OFF
• D4 is OFF
• D5 is ON

I have already tried a factory reset (by shorting all pins of the CN4 jumper for more than 5 seconds before power-up), but it didn't help.

I also checked the Ethernet jack for any signs of physical damage or corrosion, and tried using a different cable connected directly to the PC and through a router.

Is it possible for the L829-1J1T-43 jack to get damaged by an ESD (electrostatic discharge) event? Or could it be a failure of the Ethernet PHY/MAC section?

Thanks in advance for any advice.

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вторник, 2 июня 2026 г. в 07:29:52 UTC+4, Serj Derugin:

[Ed Grafton]

• Insert this shorted plug into the KEY/PTT jack.
• Power on the Hermes Lite 2 and keep the connections shorted for 1 to 2 minutes.
• Turn off the power and remove the shorted plug.
• Power the radio back on normally; it will now be restored to factory default
• 
  
• Ed

[Serj Derugin]

I did this first thing

вторник, 2 июня 2026 г. в 19:59:52 UTC+4, Ed Grafton:

[Ed Grafton]

Your statement above shows you removed shorting plug before turning the unit on. The shorting plug needs to be inserted while powering on.

Ed

[Serj Derugin]

Sorry for the incorrect description, I'm using a translator, thank you

вторник, 2 июня 2026 г. в 22:21:38 UTC+4, Ed Grafton:

[Ed Grafton]

No problem. I am at my limit of knowledge to help you further, but someone surely will be here to help.

Ed

[Serj Derugin]

It looks like the ksz9021rn chip is failing, am I right? I measured the resistance relative to ground on pin 47 of the chip (capacitor C39), and it's 23 ohms.

вторник, 2 июня 2026 г. в 22:49:14 UTC+4, Ed Grafton:

[Doug Lung]

If I'm reading the schematic correctly, it looks like FB10 is open. Looks like that's just a ferrite bead, probably on a very thin wire.