Hi
I have RouterBoard SXT 5nD antenna that when I connect it to power the power led and three top signal led are light up and then nothing happens.
I checked all voltage and they are present.
1.7v and 2.1v and 3.3v and 5v.
caps around ICs are not shorted.
what's the problem?
this the picture of it after connecting power to it.

Cpu or nand problem

Most probably is a NAND problem. Try to reinstall RouterOS using Netinstall and after installation, check Bad Blocks percentage under System -> Resources to confirm it.

Regards.

sorry for late reply.
I found another topic in this forum that is like mine.
viewtopic.php?t=124792
I can't connect it to netinstall. it's not respond to any action. not reset button not any things.
most people says it because of u901 the 25x10 win bond chip but by changing it the license not work.
if it's u901 or NAND how can I copy the license before doing any thing else.