I have my second GS645 (first stolen) and a GS645W. My recollection (cannot access mine now to check) is that the meter activates when you press the shutter release and automatically shuts off after 15 seconds or so to save the batteries. While on, the meter reads out whatever the viewfinder is pointed at, as it reads the light coming into the finder. I've never heard of this problem before in these cameras, but the symptom described suggests that some volatile component in the circuit, like a capacitor, as weakened or failed. It is probably simple to repair once the problem is identified. Camera Wiz in Virginia used to be the "go to" repair shop for GS645 cameras. You might send them an email or make a call. Quality Light Metric in LA is a great meter repair shop, but I do not know if they work on in-camera meters. Worth a call.