My router Dlink G684T began to behave strangely. I can't establish connection with it using LAN. Even if I establish connection, when I open router Web interface, I lose connection after few seconds. Here is router board:

You can see there is one bad capacitor (1000uF, 25V). Can it be reason for strange behaviour of LAN ports? Is there any other component which can make problems?

 

Every component you see could potentially cause a problem, or it could be something you cannot see, the software.

That said, one failed capacitor is certainly enough to bring down the entire device. It's in there for a reason, to perform a function, and you can be pretty sure it is no longer performing that function.

Routers are cheap. I suggest buying a new one and spending your time on battles you may win.

 

Thanks for answer. I will first try to fix it by replacing capacitors. If this does not solve problem, I will buy new router.

 

If it has just begun to behave intermittently, I bet that the trouble is exactly that capacitor. If you're buying a new capacitor, might as well get several. And if replacing that one troublemaker fixes the issue, consider replacing others near it of like kind.

 

You can see there is one bad capacitor (1000uF, 25V).

The final failure mode of most electrolytic caps is open; so you could try tacking a new cap across the suspected bad one to see if it helps. If it does, you've found the problem. If it doesn't, still worth seeing if replacing it fixes the problem.

Most things aren't worth fixing these days. If I can fix it, fine. If I can't, it's usually more cost effective to buy a new one than to pay someone to repair it.

 

My vision definitely isn't what it used to be. Which capacitor in those photos is bad? Is it the brown one near the top center (the top looks puffed up)?

 

My vision definitely isn't what it used to be. Which capacitor in those photos is bad? Is it the brown one near the top center (the top looks puffed up)?

I did not notice it on first pic. But second pic makes it easier to see.

 

Thanks. That's the one I was figuring it was.

 

The final failure mode of most electrolytic caps is open; so you could try tacking a new cap across the suspected bad one to see if it helps. If it does, you've found the problem. If it doesn't, still worth seeing if replacing it fixes the problem.

Most things aren't worth fixing these days. If I can fix it, fine. If I can't, it's usually more cost effective to buy a new one than to pay someone to repair it.

As dl324 noticed the bad capacitor, you should go with new components to solve this issue.