Electronics > Repair

Onkyo randomly stops audio

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irondemigod:
I have an Onkyo HT-R390 hooked up to my laptop with the RCA jacks, and when audio is playing, the audio would randomly fade out 15-20mins in (not necessarily in this time), and would only start playing again after turning it on and off after a few times. This happens to all audio sources including optical and HDMI.
Tried searching up my issue on Google, but all the videos were about a DSP chip causing issues with HDMI board, such as no sound playing at all.

Is there anything I can do to fix this?

Thanks!

Service Manual:
https://data2.manualslib.com/pdf7/240/23962/2396146-onkyo/htr390b.pdf?d13bfffb71506c02afbd37edc2cf1f24

calibrationfixture:
Hi irondemigod,

Look at the Power Supply/Standby Board. Just fixed a Onkyo TX-NR676 AV Receiver. No Powering Up and Display. I take the aforementioned Board out for inspecting (Electrolytics, Relais etc.). No issues. I had to disconnect a few Ribbon Cables with the Main Processing Board. Putting it back all together gives a Receiver that Powers Up, is Initializing (yes, it is a Computer) and working again.

Calibrationfixture

fzabkar:
This is from the troubleshooting section of a different Onkyo product:


--- Quote ---❏ Sound suddenly reduces

• When using the unit for extended periods with the temperature inside the unit exceeding a certain temperature, the volume may be reduced automatically to protect the circuits
--- End quote ---

irondemigod:
Is the display supposed to show that the protection mechanism has been activated? Mine does not, and apart from no audio, everything else behave as normal.

MathWizard:
Does it happen to all speaker outputs, do headphones still work, when speakers loose the sound ?

If you have a DMM, it shouldn't be too hard to track the audio signal back from the output (plus with the schematic's) and see where the signal normally comes from. Then when it stops working, you should see it missing from those places.

If it's just analog audio in, and all outputs cut out about the same time, I'd suspect something like an Analog Input switch IC, or Volume control IC, or something related to them, has a problem. Assuming the power rails are all working, and it's not the actual output drive cutting out, but yeah it could be that too.

Or it could be some other muting function kicking in.

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