the night sight NV-PVS4 does not turn on.
the weapon, sight and battery are in good condition.
the battery is charged.
when aiming we see as through a regular sight, not a night sight.
I tried to turn on and off the night vision on the helmet, I thought it might affect it, but no, the sight does not work.
I tried to take it out of the weapon, also take out the battery.
the sight does not work.

And this is what this sight looked like before: