Recently bought this projector for little of nothing. The rewind was not working properly,no big deal fixed it in a matter of minutes. The sound was nice and strong,but suddenly went out. Sometimes it pops through the speaker and other times works,but seemingly not as strong as first. Other times it just shuts down all together with nothing through the speaker. There's a short somewhere apparently,but with no diagram I don't even know where to start. Anyone have an idea where the problem might be?