Yamaha ypg 635 left speakers not working

[hick.man]

hi, I recently got a yamaha ypg 635 given to me and I noticed the left speakers are not working. I have reset the keyboard and I don't see any kind of balance setting for this model. maybe the amp board is toast? just wondering if anyone might have any idea's?
thanks

 

[happyrat1]

Probably a broken circuit, cold solder joint or loose wire in the left signal path.

 

[happyrat1]

It could also be as simple as a a dirty volume potentiometer. Try a squirt of Deoxit in the volume control.

 

[Rayblewit]

Does Deoxit have a long use by date?
It is very expensive! Especially since you only need a little squirt.
Is there another substitute product? Cheaper maybe?

 

[happyrat1]

It can sit in the can forever as long as it stays pressurized. Other cheaper contact cleaners are out there but it can be a crap shoot.