Page 1 of 1

RB751 2Hn Flashing LEDs - Work Around

Posted: Fri Aug 03, 2012 12:35 am
by kshogan
After going through about 100 RB751s and doing burn-in tests, we have seen a few go into that weird state of just flashing LEDs after power-up.

For some reason, plugging in a 24Vdc POE seems to clear the issue, and then subsequent powers with the barrel/wall wart power supply work just fine. Go Figure

Any ideas on what causes this?

Re: RB751 2Hn Flashing LEDs - Work Around

Posted: Fri Aug 03, 2012 5:53 pm
by rviteri
I've had a bad experience with these units. They hang randomly, I've sent the support files but mikrotik can't find the issue.

Re: RB751 2Hn Flashing LEDs - Work Around

Posted: Mon Aug 06, 2012 8:57 am
by normis
If all LED lights flash at the same time, and changing the PSU fixes this issue - you better send the unit for replacement. PSU change is only a temporary fix, the hardware problem is still there, and your wireless will not work at full capacity. RMA is the only solution. Only devices from the very early first production batch could be affected with this issue.

Re: RB751 2Hn Flashing LEDs - Work Around

Posted: Thu Mar 03, 2016 5:40 pm
by kau
Have the same issue with 751 , it was bricked years ago.
The same - just flashing with all leds.
Any way to restore/RMA it now?
Thanks! :D

Re: RB751 2Hn Flashing LEDs - Work Around

Posted: Mon Jul 04, 2016 2:38 am
by kau
If all LED lights flash at the same time, and changing the PSU fixes this issue - you better send the unit for replacement. PSU change is only a temporary fix, the hardware problem is still there, and your wireless will not work at full capacity. RMA is the only solution. Only devices from the very early first production batch could be affected with this issue.
Have the same issue with 751 , it was bricked years ago.
The same - just flashing with all leds. 
Any way to restore/RMA it now?
Thanks!