The GameBoy Advance SP works, however there's no audio from the speaker, the SP was different from the Advance in that there's no 3.5mm headphone jack either so I can't easily compare/check it.
What're the steps I can take to start diagnosing this and where the problem is? I'm not familiar with using an oscilloscope if necessary, though I have a bitscope one I could try to work out how to use. I'm not seeing any physical problems.
