Hi. I have 4 beo4 cinema's, but one has very poor light conditions. Can this be repaired?

My cinema Beo4 gets used once or twice a week and have to change the batteries regularly , it only needs a small voltage drop and becomes very difficult to see , even with new batteries it’s not great . Certainly wouldn’t buy another . I enquired about getting the parts and converting a standard Beo4 but they said that no parts are available .

Richard

I've tried to replace the batteries. It is not the error.