Hi, thank you for contacting JustAnswer.com. My name is Russell. I thought I should add something, to help provide the right answer to your question.
The Speaker Overload (and the lack of sound output) almost certainly indicates an output short.
Or, an overload of the audio output circuitry.
1. a crossed wire, loose wire that could cross, etc.
2. a shorted speaker. Hard to check for, really, but disconnecting the speaker and seeing the condition be relieved will prove it, simply.
3. more difficult: output circuitry from the audio section. You'll need electronics skills to find the shorted component... indeed, it may take some skill to just find the audio output section, but obviously, the speaker wires will lead to it, Voila'.
Perhaps I could add other advice, but I think I'll leave it at that for now. If you need further advice, or want a referral to a jukebox repair pro in your region, let me know in any case, please.
(And if this answers your question, please rate my answer. Thanks.)