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1.Check the Input wire cords mostly there will be a cut in Ground shield.
If the Point 1.is not solved. then try to open the Amplifier(Don't open if you are not a qualified technician) check the input connector set block's leg soldering might be a dry solder.
Start by choosing FM on a known frequency with a station broadcasting and volume is turned down to a NORMAL listening level. Next, make sure speaker selector isn't the wrong position (make sure "SPEAKERS OFF/A/B/A+B is set to A [or B to match the speaker terminal connections]), check to be sure "Mute" function is not activated by pressing the MUTE button on the remote to toggle it between on & off, Make sure headphones are disconnected. Make sure "PROTECT" is not displayed on the front as this indicates a shorted speaker wire - shut off and repair the shorted wire(s).
If you get sound on FM, but have an issue with another external component (CD, DVD, Phono, etc.) check the cables between the component and the input panel on the rear of the STR-DE595.
The protect thing is to do with an overload. It's more than likely that something in the main amp section has failed (perhaps a transistor on the big heat sink). The cause often speaker wiring touching together. You should look carefully at the this section for damage or burning. If you have a ohm meter you can test the transistors. If you place the probes on the terminals of each transistor and you get a responce like you had touch the probes together, you have located the source of the overload.