Onkyo TX-NR609 Receiver Repair: DSP Chip Reballing and NAND256W3A2BN6E Flashing Experience

Hi everyone!

I turn to you in the hope that someone could point me in the right direction since I lack knowledge and experience in the diagnosis of audio equipment. (My experience is in computer chip level repairs.)

I bought an Onkyo TX-NR609 receiver which initially produced no sound on speakers/headphones. There was no delayed relay click, the speaker matrix icon didn't show up, USB/NET was stuck in "Now initializing", and instead of DSP/1st NET firmware version, there were ?????????...

There was flux residue around the D830K013BZKB4 DSP chip (Q3001) on the HDMI board. Some near SMD resistors were out of their place, and near connectors had burn marks.

I cleaned the board in a US cleaner, reballed the DSP, checked and re-soldered the moved resistors according to the schematics. No change.

I then removed and flashed the NAND256W3A2BN6E (Q3002) with firmware for the TX-NR609 (source elektroda.pl).

I now get the delayed relay click, speaker matrix icons show up, I can access the USB flash drive and internet radio/DLNA, and the DSP/1st NET firmware version shows.

I even get sound from speakers but ONLY when the source is a USB flash drive or internet radio/DLNA. I get no sound when the source is the tuner, analog inputs, or HDMI inputs. Regardless of whether stereo, pure audio, or direct is chosen.

When there is sound (from USB/DLNA), the AMUT signal is -14.8V, and when there is no sound (other sources), the AMUT signal is 2.48V. I disconnected the 47-ohm resistor (R636) from the MPD70F3746GJ (Q701) MCU and pulled the AMUT_C line to GND, thus disabling the muting circuit (AMUT signal is -14.8V permanently), but I still get no sound from inputs other than USB/DLNA.

Which part of the circuit should I check? PCM9211 (Q301)? Is that the common point of failure for the analog and HDMI signals, but signals from USB/Internet radio bypass it?

I know my friend, the PCM9211 chip to be replaced, I had a lot of such cases with this problem.

fachura wrote:

I know my friend, the PCM9211 chip needs to be replaced, I had a lot of such cases with this problem.

Thank you very much for your help.

I have just ordered a replacement from Ali and will replace it once it arrives.

No need to let me know what the effect will be after the exchange.

I'm still waiting for the chip to arrive here from China. I will post here as soon as it arrives.

Thank you again for your help.

>>20643567

I have replaced the PCM9211 and the no sound issue (only sound from USB/DLNA) still remains.

In the meantime, I have found a service manual for Onkyo TX-SR608 (very similar system) in which the signal paths are very clearly presented, and it even comes with the no sound troubleshooting chart.

When I find time, I will measure the analog signals as per instructions and try to see where the issue is.

After replacing the PCM, do an update via USB from a pen drive.

fachura wrote:

After replacing the pcm, do an update via USB from a flash drive.

Thank you for your suggestion, I reflashed the firmware via flash drive but this didn't help unfortunately.

Someone else was working on this unit before me - it's possible they have removed some elements while they carried out diagnostics - I see traces of flux on different boards, which were not put there during the manufacturing process.

I think the best course of action is to fully disassemble the unit and do proper measurements - trace the analog signals with the help of schematics to establish where the signal goes missing.

Hi
did you solve the problem?

serhatsev wrote:

Hi,
did you solve the problem?

No, I didn't yet - I use it as is for listening to the music from internet radios/WiFi streaming.

Do you have a unit with a similar problem?

Quote:

Benzer sorunu olan bir biriminiz var mı?

I have Onkyo TX-NR 809. Unfortunately, there is no speaker icon. I can't get any sound. I can receive images from HDMI. It does not detect USB devices. Network, firmware, and remote controller setup are disabled. I bought a "D810K013DZKB4" chip from China. But I couldn't find anyone in my area who could change it. Now I'm looking for a technician who can replace it.