I had a headset completely stop working in the middle of the day a while back. Tried all of the obvious troubleshooting and through a process of elimination determined it was the headset. Sent it in for repairs and they sent a replacement out. Got word later that when it was being sent to Taiwan for refurbishment, it was noted that one of the Liquid Detector Indicator (LDI) had been triggered (could have only been from sweat as the headsets were never exposed to any other liquids). Was told that there are 3 of them on the Vive Pro (not sure if they are the same on the old Vive) and if they are white, they are ok, if they are red, liquid has been detected by the sensor. Locations of the sensors are:
LDI 1 - if you remove the face cushion and view between the casing and the frame , there is one inside the unit.
LDI 2 – if you open the distance adjustment open as far as possible and have a look behind the nose shield rubber .
LDI 3 If you remove the All in one cable , there is one beneath the Socket.
Just thought I would pass on this information.