how do i know if it is the HTC Vive Base Station laser diodes module is broken?

Hey guys, if you do not know whether your htc vive base station laser diodes modules works well not. Please do following my step:

1st:    please power on your htc vive base station, and let it works

2nd:  wait few minutes after the lighthouse is in working, please take out your mobile, and scan the the top of the base station via your phone camera ( please do not remove top cover), if there are 2 led lights, that mean, it work well. please check the screenshot.

If you can only see 1 led light, that mean, one of the laser diodes is died.

if you can find 0 led lights, that mean, both of them are died.

you can buy the HTC Vive Base Station Laser Diodes here.