Linksys router works but absolutely no lights

I bought a used Linksys WRT1900ACS router on eBay. I got it for $50. New it goes for close to $200. IT works. But none of the lights on the router go on! At first, I thought it is defective, and the seller agreed to take it back. But then I tried using it, and it works. When I turn it on, the LED's on the router flash for a fraction of second and then stop and never light up again. Does this mean this router is going bad? Or could it work well and worth the risk of keeping it?

This is a known issue with the WRT1900AC series that Linksys used crappy LED lights on it that dim to almost nothing in a relatively short time. The LED lights will have to be replaced on the board. I am looking at the exact same issue with my WRT1900AC. My LEDs still work, but are extremely dim.

https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=308797&sid=f7437b54740bc8567281da3894f6c73c