Onkyo TX-NR555 Crackling sound. Unique problem

somethingfishy
New Member

Posts: 5

Onkyo TX-NR555 Crackling sound. Unique problem Oct 20, 2024 6:22:51 GMT -5

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Post by somethingfishy on Oct 20, 2024 6:22:51 GMT -5

I am creating this post as I haven't seen anyone else experience the same problem as mine.

My firmware looks good, have reset it multiple times. I fear it might be a faulty power rail or DAC?

The distortion happens on all the channels: front, left, back, center...
And most importantly, also happens in the "PHONES" output.

Either the "PHONES" output is just the speaker's output thru a limiter/resistor (so it first goes thru the speakers amp), or the amplifier is working properly but the DAC is messed up.

I am up for any fix, no matter how difficult it might seem.

Here is a video showcasing the problem:

Edit:
The speaker in the video is old but works fine, already tested on another amp
Remember, this happens on all channels, it's properly plugged

Edit two: I found somebody that had a different problem but had at one point the same low quality sound problem as me:
mention1
mention2

Last Edit: Oct 29, 2024 13:20:19 GMT -5 by somethingfishy

ducklite New Member Posts: 14	Onkyo TX-NR555 Crackling sound. Unique problem Oct 28, 2024 21:28:21 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by ducklite on Oct 28, 2024 21:28:21 GMT -5 just listened to the video, that problem could be Q4001 or the muting circuit is turned on but not fully muting transistors Q4100-Q4109. I have had that problem before but mine was a bad Q4001 IC.

serafis
Full Member

Posts: 180

Onkyo TX-NR555 Crackling sound. Unique problem Oct 29, 2024 1:29:31 GMT -5

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Post by serafis on Oct 29, 2024 1:29:31 GMT -5

Oct 20, 2024 6:22:51 GMT -5 somethingfishy said:

Either the "PHONES" output is just the speaker's output thru a limiter/resistor

That's how the phones output usually works, using the L/R Front amp channels, plus a relay to turn those speakers off and inform the MPU that the phones are plugged in so the correct DSP options can be used.

From your video, I see the MPU firmware is OK but not sure about the DSP firmware. For Onkyos, as soon as the MPU firmware version is displayed, usually pressing the Tone + button will move through the various firmwares (MPU -> Video -> DSP).

Also, is the crackling sound random, or is it 'in time' with or a distorted version of the music ? I couldn't tell from the video.

somethingfishy New Member Posts: 5	Onkyo TX-NR555 Crackling sound. Unique problem Oct 29, 2024 13:19:39 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by somethingfishy on Oct 29, 2024 13:19:39 GMT -5 Maybe you were refering to this serafis but i dont know how to scroll that menu

somethingfishy
New Member

Posts: 5

Onkyo TX-NR555 Crackling sound. Unique problem Oct 29, 2024 13:30:25 GMT -5

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Post by somethingfishy on Oct 29, 2024 13:30:25 GMT -5

Oct 28, 2024 21:28:21 GMT -5 ducklite said:

just listened to the video, that problem could be Q4001 or the muting circuit is turned on but not fully
muting transistors Q4100-Q4109.
I have had that problem before but mine was a bad Q4001 IC.

Will take a look at it

madmal
Junior Member

Posts: 22

Onkyo TX-NR555 Crackling sound. Unique problem Nov 6, 2024 15:14:38 GMT -5 via mobile

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Post by madmal on Nov 6, 2024 15:14:38 GMT -5

That's the kind of distortion you hear when an amplifier stage is not getting the right voltages or one half of the + - rails is missing. Unlikely that this is the case in the power amp section as it would go into protection if that was the case.

I think you should eliminate the digital section first. Set front speakers to large and feed an analogue source into the CD input and set to pure direct. If you're still getting same distorted sound that confirms the issue isn't on the digital side.

Also check the zone 2 out, that uses a different DAC.

Doing these things will help you home in on the problem area....

Last Edit: Nov 6, 2024 15:16:21 GMT -5 by madmal

albertto: Hi everyone. This is my first post here, so greetings to everyone. I hope to help and get helped in my diy prjects or other stuff. Thank you in advice!! Nov 2, 2024 12:45:30 GMT -5 *

zerolearner: Hi team members I'm new to the forum. I have denon X2000 firm issue I replaced the new ADSP IC but upload the firmware via USB port I got a error message connection failed 5A. FLAG0 present 0.84V is there any JTAG programmer for update the firmware. Sept 30, 2024 22:36:28 GMT -5

redpill: Would you able to provide more details in regards to your fix. Did you replace faulty unit or fixed yourself? I'm having similar problem and wonder how to approach it. Thanks. Lucas. Sept 8, 2024 1:10:29 GMT -5

Repair Almost Anything

Onkyo TX-NR555 Crackling sound. Unique problem

Post by somethingfishy on Oct 20, 2024 6:22:51 GMT -5

Post by ducklite on Oct 28, 2024 21:28:21 GMT -5

Post by serafis on Oct 29, 2024 1:29:31 GMT -5

Post by somethingfishy on Oct 29, 2024 13:19:39 GMT -5

Post by somethingfishy on Oct 29, 2024 13:30:25 GMT -5

Post by madmal on Nov 6, 2024 15:14:38 GMT -5

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