Yamaha PSR E313 No Sound Issue

Good morning Buddies,

Please I have a yamaha PSR E313 with a No Sound Issue
I have done some checks on it
I just replaced d 1000uf 25v capacitor
And i also noticed some scratches on d PCB lines, I then bridge the line with a tiny wire soldered to it yet still no sound produced.

So please what could be the common causes of no sounds on this type of Keyboard?

Thank you for your quick responses.