Problem Yamaha YSP-1 problem has no sound

I purchased a Yamaha YSP-1 in december 2006 and in january 2008 for no reason it stopped working. 
Like if I was on mute, no sound at all.

Did try every thing but finally went to dealer for repair.

They had to change the PCB POWER PART NUMBER WE218600 PRICE 184.59$, ADD LABOR 105$ TOTAL 289.59$ Canadian before taxes.

roger@transcopies.com