HTR-5890 receiver keeps shutting down

5 seconds shut down: dc protection triggered. (DC outputted from speaker terminals.)Make sure +B and -B are equal first . The problem also comes from voltage amp circuit board including differential amp and constant current source but power transistors mounted are ok. Remember to download HTR 6130 service manual .

Yamaha RX V750 power on but cutoff

Hi,

With the power off, try to disconnect every component and then power on the receiver. If it still shuts down, then it is an indication of an internal error and the unit needs to be serviced.

Regards,
Yamaha Support

Register and download the manual for free at retrevo.com

http://www.retrevo.com/s/Yamaha-HTR-5890-Receivers-review-manual/id/394ci071/t/1-2/

Page 25 discusses the minimum speaker impedance setting for expected lower-than-8-ohm loads. Running A AND B may present a load that is dangerously low. BTW: 6 is not a whole lot lower than 8.

Look at your speakers' impedance specs. Running them in parallel would present a much lower load than either pair alone.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

You very well may have blown and amp or a speaker.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Eure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked

I have the exact same issue, except that it sometimes turns on (very rarely though)

You are probably connected to the pre-out jacks. These are not amplified. Connect them to the B speaker outputs(screw down connectors). If that won't work (and it should), you can connect to the "Presence" speaker connections(spring loaded connections).

Circuitry protection means the unit is overheating so a fuse blows and shuts down the power to save the electrical components.  You need to find the fuse and replace it.

Power supply is burned out. surge or spike got it, replace power supply unit.

One last try with everything disconnected!
Other than that I suspect internal surge damage.

Remove all speakers from the receiver and try powering it up again. If it still shuts down odds are it needs repair of one of the output channels.