Question about Onkyo TX-DS777

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Onkyo TX-DS777 goes straight to protection mode

When I press the stand-by button to turn the unit on it turns on then as soon as you hear the speakers click in it goes into protection mode. This is even with everything removed and the unit sitting on a bench stand alone.

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  • wise_guy47 Nov 05, 2008

    I have exactly the same problem with my HT-R520..... may have been caused by overheating is what I was told.... and is now a voltage/current issue with a rectifier or diode somewhere in Power Supply. Needs to be sent to a repair shop. Not a problem for a DIY'er.

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My Onkyo TX-DS77 has very low sound output even when the whole volume is turned on. Please assist me.

Regards,
Joseph

Posted on Sep 01, 2011

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Hello.You have shorted audio outputs. One of your channels has shorted output transistors. If your unit uses output ICs then one of them is shorted. Both types ( individual transistors or ICs ) are located on the large finned heat sink. The parts are available from http:\\www.tritronicsinc.com. good luck

barneyluc

Posted on Oct 19, 2008

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Posted on Jan 02, 2017

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This means that there is a short detected on one of the amp outputs. Try disconnecting the speakers from the back of the unit and power on. If fault still persists then likely you have a bad output ic or FET (transistor). If fault goes away after removing speakers then plug them in one by one to see which is the culprit.

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