Hello,
I have the same problem.
Yesterday I bought a GSN. The original battery is still in the camera and when I press "battery check" the green light is on.
I set asa 1000, f 1.7, the meter shows "low", even when I hold the camera in front of a bright bulb.
The camera is in general good condition but there was a haze on the lens and there is still a haze in the viewfinder.
What could be the cause? Could the battery be too low even when the green light is on when I check the battery, is the lightcell "broken". I don't think it's the electronic circuit because than I wouldn't see the "low" indicator.
I'm a noob in electronics. I'm not afraid from opening camera's but I need to know what I'm looking for.
Thank you for guiding me.
Edit: yes, the shutter sounds the same (1/500) on every setting I choose.
grz