Question about Onkyo TX-DS777

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No Life, does NOT power up, Fuse is OK

The unit fails to power up. There is no problem with the AC fuse, but somehow the 13 VDC dos not get generated. The 13 Volts transformer is OK. The "POWER" pin from the connector on the AC input PCB does not seem to be getting the up. Any thoughts? ? ? Thanks


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  • TAWDI May 10, 2008

    Thank you much for trying. There is no problem with the standby transformer, secondary OK, Bridge rectifier across the secondary [13 v ] OK, but the unit does NOT even light up, nor does the power On/Off switch do anything. Even if the AC line is brought directly to the primary of the main power transformer the receiver does not even light up. Again thank you much for trying.Tawdi


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Try this since it might be dead any ways put on surge protector hit the surge button 3 times fast this can shock the system and bring it back
heres another idea why its off fraid wires in the speaker outputs jacks sometimes the little wires pull off inside when disconnecting system this can trigger a fault in sterio to complete shut down till cleaned out hair is also a very good conductor to shutting down the system

Posted on May 10, 2008

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There is apparently some component in the stanby circuit that is malfunctioning. There may be a milli amp fuse off the standy transformer secondary. Check - don't confuse with a resistor. It may read 2 ohms or less

Posted on May 10, 2008

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1. Make sure the AC outlet is good.
2. Make sure there is no damage to the AC line cord.

3. Look to see if there is a fuse at the rear of the unit. It's usually located inside a black circular housing with a screw off cap that says "fuse".

If not, unplug the unit and remove the outside cover. Look for a blown fuse on the motherboard or power supply. Replace it with the EXACT value of the original fuse. You can purchase a new fuse at Radio Shack or hardware store or auto parts4.gif store. Try powering up the unit again and see if it works now or whether the fuse blows again. If it blows again, the power supply may have been damaged.
Please let me know if I can be of further assistance to you.

Good luck!

- Jim

Mar 19, 2008 | Onkyo TX-SR601 Receiver

1 Answer

Unit won't power up completely

The clicks you hear are the relay that completes the circuit for 110V AC to the main power transformer. Mine had the same problem and here's how I've gotten it to work. A lightning strike near our house caused it to fail, and I traced it to the power transformer relay activation circuit. The tuner and amp were fine. I found a bad transistor in the relay circuit, but didn't have a replacement on hand, so I soldered a jumper wire across the relay switch connections on the power transformer circuit board. This connects the 110V AC directly to the power transformer. DC Power to the amp and tuner circuits will still be controlled by the power switch, but the transformer will be supplying all the AC voltages to the main board. If there is a real problem with the circuits that load the transformer or the transformer itself, then the fuse will blow. If the fuse doesn't blow then I suspect the problem is just in the power sequencing circuit itself, that is not needed for operation other than to make the unit "Energy Star Compliant". A lot of electronic items have a transformer that is not switched, and only fused, so that the supplies are available at all times.

Jan 24, 2008 | Audio Players & Recorders

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