Usually my receiver works just fine. But now even though the standby light stays on, when I turn on the power it stays on for 3 seconds and then turns off. I tried using a different power cord with no success. What do you think?
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Re: Onkyo TX-DS989 not staying on
This sounds like the action of some protection circuit that is monitoring some condition or voltage that isn't within its design limits.
If it was mine, I'd look for an Onkyo forum to see if others have experienced the same problem.
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If Zones are turned on or, if a mobile device connected to the Front Input is charging (MHL), the HYBRID STANDBY indicator won't light. See the TX NR515 owner's manual at http://filedepot.onkyousa.com/Files/own_manuals/TX-NR515_English.pdf for more info.
The trouble is almost certainly bad capacitors in the power supply. As they age they become very slow to charge up (think of them like buckets that store electricity for other parts to draw on, and it's taking them much longer than normal to fill). As a result it's a while until the rest of the circuitry starts working properly. But once they've charged, the thing works like it should.
If you know someone with some electronics skills, they could check the capacitors and replace any that are visibly bad or don't measure correctly. Or you could see about getting the receiver serviced if you have a shop in your area. Musician's supply stores are a good place to check, or ask retailers if they have anyone they suggest. Since the receiver is basically okay otherwise, having this repaired would probably be worthwhile.
The only thing to test would be to disconnect all speaker wires at the receiver then turn it back on. If it still won't turn on, it's an internal power supply issue and will need service. If it turns on, post a comment and I can walk you thru further troubleshooting. Hope this helps
You didn't state it but I assume the other channels are functional?
The auxilliary channels are generally lower power and may even be serviced by a different voltage than the main amps.
If it is so designed, you may have something as simple as a blown fuse for the main amp supply.
If the aux. channels are equal in power, the power supply may still be dividing the load so a fuse still could be at fault.
The unit could also use integrated power amplifiers in which case, if two channels are operating from a single module it could be a module failure.
I don't see much chance of anyone repairing this system without examining it in the first person.
If the unit will not leave standby I would remove all power, disconnect *all* connections at the back, reconnect to a power source and try powering on. This will eliminate any connection causing the Onkyo to stay in standby due to a short. If it still will not enter power-on mode, you may want to look at the power source (is it properly grounded?), but beyond that the unit probably needs to go back.