What could cause this? 
looks like lightning strike. does it smell like burned? does it work with power jack?
I’ll try power jack tomorrow… Of course it smell like burned, PoE splitter, RJ45 connector, everything is burned 
The problem is why this happened in middle of day, and it was very beautiful sunny day… 
i had this when i had 24vpoe into rb600
bad poe no protection and had 500v go throught it with a nutrual fail on the 220 side it sent it throught the poe into the board maybe you had the same thing
must try if you turn directly connected to the jack. Sometimes this damage is lightning or if I had my tower was hit by a line of action that was nearby and equally so I burn my radios.
Is the power supply ok? The one that was used when this happened?
If it’s also burned, it’s a power surge from your electricity supplier.
Hello, it’s probably over-voltage… We are using directly from mobile telecom power equipment 48V output…
And power jack works fine But I can use only ether3 port, another two are dead…
ether1 and ether2 have one controlling chip, ether3 is separate with its own chip controlling it.
Looks like your RB600 is now an RB411. 
or more like RB414G without POE 
rb600 is more powerful than RB400 series. And you still have miniPCI slots.
Hahahaha, You are right! 
Odd.
I have had two towers struck with RB600, killed Ether1 data, not the POE on either. Ether2 and 3 work fine.
The same strike completely fried a 411 and 433.
you just got lucky maybe some parts before controler for ether1 are damaged not the controlling chip.
Probably so.
I’ve got two more where the tower took a discharge, lightning struck around 100ft of the equipment, fried ether1 on two other 600’s. I haven’t gone up to try them yet. Ethernet is not required on those towers.
I like that I can split the power and the ethernet and not have to take the AP down, and on that same note I am concerned about the towers I have running 333s and 433s.
Nothing really you can do about lightning. It goes thousands of feet. Ground everything, surge suppressor in line and hope for the best.