Loudspeaker sometimes works sometimes doesn't

@overflowunt “if I beat the phone on the back a few times, the sound comes back to normal, “ sounds like a bad connection or a bad speaker. It’ll all be a guess until you open it up and see what damage awaits you. Once you do that, post some good pictures of your logic board etc., with your QUESTION. That way we can see what you see. 在已经存在的问题里加入图片

While you are add it, go ahead and repair the broken screen since the speaker is mounted to it. It is not a complicated task just follow this guide iPhone 5s耳机扬声器更换. It’ll eliminate some of the guessing as well.

@overflowunt yes there is since the bottom speaker is attached to the back of the case. Principal still applies. Open it up, repair the front assembly, check the ribbon cables, connectors and worst case replace the speaker iPhone 5s 扬声器更换