I got a black screen with the ZeldaH rom safe-trimmed with Rominator and soft reset enabled. However it wasnt where you get the weapon. I thought it was, but it was where you first get your first green rupee.
I just tried softreset on, and got the first green rupee and it didn't freeze. Unless there is a certain spot where you get the first rupee from that cause it to freeze.
In the beginning after you visit old guy in his house for the first time, leave his hut and go left (your left). Talk to the guy with brown hair - he will tell you how to throw stones. When you clear his field talk to him again and he will give you green rupee. With softreset on, game will freeze (black screen).