Dead Onkyo Receiver

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eXDee

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#119493 3-Jun-2013 12:50

Anyone want to play a guessing game?

If i have an old Onkyo TX-SR603 where the primary zone, 7.1 channel has died and has no audio output, but zone2 still works, any guesses what's failed?

Haven't opened it yet but will probably do so on a rainy day some time. I imagine there's some big caps in there and its been many many months since it was powered on, but i still want to be very careful if they are still charged. Not entirely sure of this though.

Radiotron

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#830207 3-Jun-2013 20:05

Sounds like fun, if you're in the Auck, try contacting WOT Electronics, Warryn might be able to help. If you are unsure about the inner workings of the beast, get a decent tech to check it out. http://www.wotelectronics.co.nz/

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insane

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#830209 3-Jun-2013 20:10

Have all the channels in zone 1 failed? My understanding is that there are individual amps for front, rear, etc etc. So perhaps something on the input side has gone?

eXDee

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#830233 3-Jun-2013 21:07

Its been ages since its been connected up, but as far as i remember not a single channel works.

Whats it likely to be when these things die, a blown cap that could just be replaced? or something a bit more complex?

Radiotron

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#830254 3-Jun-2013 21:44

I'll go with "a bit more complex" . Blown cap? Do you know what you are looking for, can you faultfind to component level? Can you accurately interpret the results of said faultfinding? If you can, the question would not be asked. If you're unsure, be kind to your amp and get a suitably experienced tech to have a look, preferably one with appropriate class of electrical registration and a current Practicing Licence.

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Jaxson

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#830260 3-Jun-2013 22:01

Nah, the typical failed capacitor problem is one of hdmi syncing. You've got something else there mate. Even if it was a blown fuse, fuses are there to prevent further damage, so something else wrong causes a fuse to fail etc. try for an offload to someone who might be keen here or dump it and start again.

Radiotron

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#830265 3-Jun-2013 22:13

Interesting. HDMI sync issue causes capacitor failure. Does it? How?

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eXDee

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#830280 3-Jun-2013 23:34

I believe he means that HDMI sync stops working due to blown caps. Onkyo's have been known to have caps blow in them.
This one however is the generation before HDMI came in, so isn't relevant to that particular problem.

I popped it open out of curiousity, and to give it a visual inspection. Very careful about not touching anything.
Spotted two sets of fuses, some ceramic ones hidden under the speaker output board. I believe these are not the issue though.
https://imgur.com/a/oopb1
Nothing i can see has visible signs of failure, not that i expected that.

I also recall that headphones did not work either.

Yeah i'd like to take it to a technician but their time is probably worth more money than the unit itself. This is an old one that has been replaced when it died so investing much in it really isn't worth it. This is mostly out of interest.

I found the service manual so i might see if the built in tests reveal anything.

edit: closed it back up, and went through some service manual testing.
Where indicated in the picture, sometimes test 4-22 which is front R ch shows protect NG. Other times it shows OK. On each test you can hear a click as it switches something, and then a second click when it says OK. When it shoes NG, the second click is never heard.
https://i.imgur.com/GbCUn7p.png

Seems it'd take someone who knows what to look for when servicing these things to fix it. Or in other words, its either a dud analogue only 2 channel amp on zone 2 or destined for the trash.

Jaxson

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#830332 4-Jun-2013 10:25

Radiotron: Interesting. HDMI sync issue causes capacitor failure. Does it? How?

No, as above, it's the other way around. Loss of HDMI sync was a sign of faulty capacitors in some Onkyo receivers. I know as I have personally gone through and replaced 4 or so on my Onkyo hdmi board and luckily in my case it worked perfectly.

http://en.wikipedia.org/wiki/Capacitor_plague

As I tried to convey earlier, even if the fuses had blown, replacing them doesn't really solve the problem. Something happened that caused them to blow, so replacing them doesn't fix the root cause.

Radiotron

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#830715 4-Jun-2013 21:01

Yep, fair enough. The wiki link is interesting, and I am familiar with that failure mechanism, does not seem to be relevant in this case.

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