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How can I fix my SONY STR-DE475 home amplifier?

I have no sound out of front 2 speakers but have sound out of surround and center speakers just stopped working thanks?
MARK GILFILLAN, January 2006
I can't remove "protect". I tried all the usual attempts. Is there a circuit or diode I can remove by myself.When I turn it on (AFD & set-up) light up with Protect.

Basil Burdalas, March 2010
link Click here to see other fixes for Sony.