YAMAHA DSP-AX620 HI FI AMP

[G.v.t.v]

 :unknw: Hi all! Any one got any ideas on above? Fault:-Unit is dead and wont switch on.Standby 5V to micro ok & osc, in chip is working, have checked reset circuit & on switch all seems ok,but it still wont switch on! Me thinks surface mount micro DEAD!! grrrrr!Thanks if you can help.