onkyo ht-r580

[harleyman58]

has anyone had any experience with this receiver? I have video through the hdmi and when it is turned on. but no audio you can here a light buzzing that does not get any louder when you increase the volume. any thoughts will be appreciated.

thank you kenny

[Agent24]

Re: onkyo ht-r580

Do you get audio with other inputs or is it just the HDMI which doesn't work?

Have you tried another cable? Is the signal source known good?

[harleyman58]

Re: onkyo ht-r580

none of the hdmi put out audio, also the radio will not work, or the headphones.

[harleyman58]

Re: onkyo ht-r580

service manual

[Agent24]

Re: onkyo ht-r580

If you get nothing from any input, check for a general fault in the amplifier section.

Do you know how to do signal tracing?

[harleyman58]

Re: onkyo ht-r580

no I don't know where to start,im just learning the audio side of electronics, I did electronic repair on industrial equipment.

[Khron]

Re: onkyo ht-r580

Hint #1: page 4
Hint #2: page 15

[harleyman58]

Re: onkyo ht-r580

ok on page 18 I have a green, yellow, and black wire from the main transformer. I see what I think is the protection circuit relays from a 110 volt feed. I think the main feed goes throught the relays and power the rectifier then the filter caps which is to be 52.5 volts but I get 85 volts on the 1 and 4 pins of the rectifier. the 52.5 volts go to the amp section. what am I missing?

[Agent24]

Re: onkyo ht-r580

It's a split-rail power supply with a +52.5 (+B1H_B) and -52.5 rail (-B1H_B)

So you should actually be measuring about 105v across pins 1 and 4 of the bridge rectifier.

Measure each rail separately and see if they're both low or if just one is low. You can use the rectifier's heatsink as ground ref.

Also might pay to check your meter on a known good voltage source as the meter could be bad or the battery flat.


Now would also be a good time to post a bunch of photos of the inside of your amplifier.

[harleyman58]

Re: onkyo ht-r580

ok pin 2 to ground 42.7v ac, pin 3 to ground 42.7v ac, pin 1 to ground 57.5v dc, pin 4 to ground 57.5v, pin 2 and 3 85.2v ac, pin 1 and 4 114v dc, when I power the receiver up I get a click just as soon as I push the on button, 3 seconds later another click, 3 seconds after that the last click and the speakers start humming. pictures coming next

[harleyman58]

Re: onkyo ht-r580

pictures inside of 580

[Khron]

Re: onkyo ht-r580

If the relays do click, and SOME signal does end up in the speakers, then it should be reasonably safe to assume that whatever issue is present, is before the power amps.

If there was some power amp problem (DC on the output, or some short in the output transistors), some protection would've triggered, and the output relays wouldn't have clicked on.

See my post #7.

[harleyman58]

Re: onkyo ht-r580

I found some caps I think are bad c 9023, c9025,c9026,c9028,c9030. going to pull them to make sure. these caps are on page 20.

[harleyman58]

Re: onkyo ht-r580

caps were not bad! this thing is making me mad. going to have to take some blood pressure meds.

[Khron]

Re: onkyo ht-r580

Ok, i'll try to spell it out: in my post #7, the pages i indicated contain what seem to be block diagrams / signal-flow diagrams for the various audio paths, from the inputs all the way to the power amps & outputs.

I'm sorry, but noone here on the forum can do the testing for you, no matter how much we'd want to

[harleyman58]

Re: onkyo ht-r580

ok on page 17 on the + and - 15 volt supply, q4171 was grounded. d4304 is bad letting voltage flow both ways. cut d4304 and q4171 went back to ungrounded. if everyone thinks this was the problem, I am going to replace q4170,q4171,d4304,d4305,c4170,c4171,c4172,c4173.

input please thank you kenny

[Khron]

Re: onkyo ht-r580

"Q4171 was grounded" = you mean its output was shorted to ground?

If D4304 was shorted, then that would make sense. For now, replacing only that diode should be enough at least for a test.

Although since that -15v rail (along with the -7 derived from it) supply basically all the opamps, as well as that multiplexing / source switching chip, its absence would indeed explain the lack of audio.

[harleyman58]

Re: onkyo ht-r580

yes the output was shorted to ground

[harleyman58]

Re: onkyo ht-r580

I would like to report that the bad diode was the problem with the audio. running the receiver for a few days just to make sure. I would like to thank the badcaps forum, and AGENT 24 and KHRON for all their help.

thank you kenny

[Khron]

Re: onkyo ht-r580

Glad we could help