DS lite speakers not working....???

Long story short, the DS lite speakers do not work unless the console is plugged in, when charging the speakers work perfectly fine. The console plays games perfectly fine while not on charge and headphone work fine, but there is just no sound from the consoles speakers. To trouble shoot I charged the unit while the headphones were plugged in also and the sound still comes out of the headphone fine.

Anyone come across this issue before?

I happen to have this problem too a few years ago,the speakers sounded like a dying person. so yeah,don't let go off the headphones as they sound much better than plugging it out