pioneer vsx 2021 no sound

[mmartell]

Re: pioneer vsx 2021 no sound

Thanks for posting it I'm sure it will come in handy for someone.

[andyb1712]

Re: pioneer vsx 2021 no sound

## Attached - DSP firmware dump from Pioneer VSX-LX55 ##

Tested and working in both VSX-LX55 and VSX-2021.

Circuit location is: IC9004, device is: MX25L1606E.

Version is 119 from Pioneer firmware AVR_1_204087119093

I loaded this into my VSX-2021 IC9004 although the rest of the receiver was still running an older firmware version. It then started up and ran fine. I was able to perform a full update via USB to the rest of latest version detailed above.

[mmartell]

Re: pioneer vsx 2021 no sound

Post the firmware file here if it's not too large.

[andyb1712]

Re: pioneer vsx 2021 no sound

Finally fixed this Pioneer AVR!

I bought another VSX-LX55, sold as working but it put up UE22 after a couple of days use and then stopped working too. The eBay seller refunded me and said keep it due to the high cost of return postage...

I looked at my VSX-2021 again and the DSP firmware part was showing *** instead of numbers, which made me think a failed firmware update had corrupted the DSP firmware. The service manual shows the firmware is stored in a nearby 8 pin flash chip, IC9004, MX25L1606E. I took the flash chip from the VSX-LX55 and copied the contents to the corrupted one in the VSX-2021.

This got the VSX-2021 working fully again, so my previous DSP chip replacement from China was a success after all and not a fake as suspected. All I need to do now is replace the faulty DSP chip on the VSX-LX55 too and both will be working again.

I updated this post as it may assist someone else with the same issue after DSP replacement. I have the working IC9004 flash dump for if anyone has the same problem due to a failed firmware update.

[andyb1712]

Re: pioneer vsx 2021 no sound

Closer look at IC2501 shows audio in and supply volts present but no clock signal.

Tracing this back it goes to main LSI IC101. This has supply volts present so looks like the main LSI has failed in mine.

😢

[andyb1712]

Re: pioneer vsx 2021 no sound

What a fun amp this is to work on - NOT.

The voltage reg IC9512 is not the problem with mine as I checked this first.

I have no audio out from any source or any output inc headphones, just silence but the controls all appear to be working and the audio amp stages aren't blown. All fuses are also intact.

With audio fed into the CD terminals I can trace this to the Audio Assy PWB CN3793 pins 27 and 25 (FL & FR audio in) but nothing out from that board. The audio selector and volume IC2501 is receiving audio and has power (+7V and -7v) but doesn't put anything out.

Either this chip has failed or some other control issue.

Anyone else???

[andyb1712]

Re: pioneer vsx 2021 no sound

@ Clunche

I have just bought a VSX-2021 from eBay with the 'no sound' fault hoping it would be a simple fix. It has yet to arrive but reading your posts it looks like I will be having some fun fault finding it.

I've downloaded the manuals you provided links to but the third and most useful looking one doesn't list my particular model. Should I assume for diagnostic purposes the VSX-1121 is the same or close to the same as the VSX-2021?

[Clunche]

Re: pioneer vsx 2021 no sound

I have finally identified a 3.3-V regulator which was guilty for not powering the digital assy clock section, just like what one of the poster from India reported. It is IC9512 and it's a NJM2872BF33. You can check voltage on the top side of the digital board by probing the voltage across C9609. I had around 1 V while C9601 nearby was receiving the 5.6-V input. To replace this TSOP-5, you need to access the bottom of the digital board. When back in place with a new reg. the clock signals showed up ok and the CD input plays fine but sometimes it stills hangs the sound and the amp remains dumb. I need to turn it off, wait and on again. When on, it remains on for hours without problem. Then I turn it off/on several times and then it hangs as before: display is lit but nothing out. The 3.3-V reg is always ok. I noticed also that when it happens, sometimes, I can press the standby buttons many times and the thing remains off. Then, it turns on after many attempts (the remote is also locked in this mode). The SM of VSX-LX55 or VSX-2021 says that in absence of sound and signals at two specific pins in analogue audio in, the DAC assy is to blame but I doubt it considering the random problem with the stby button. Looks like one of the regulator is having problems but this machine is full of LDOs of all kinds. Which ones to check is really the question there and many are not accessible. I'll keep searching and will post my findings if any. If you gents have suggestions, I'll be happy to read them, thanks.

[Clunche]

Re: pioneer vsx 2021 no sound

I have finally found the manuals for the LX55. You need RRV4230, RRV4204 and RRV4194. They can be downloaded in the link supplied by Madana1 for the first ones but at different location for the third and most useful one:

RRV4230, RRV4204: https://www.hifiengine.com/manual_li...vsx-lx55.shtml
RRV4194: https://www.hifiengine.com/manual_li...vsx-1121.shtml

You need to freely register to download these manuals. Seems like the RRV4194 is the one needed for full assembly description with schematics.

[madan1]

Re: pioneer vsx 2021 no sound

Then you will have to work with what is available.
Check the older/similar models.. usually the hdmi boards are the same or with minor changes.

[Clunche]

Re: pioneer vsx 2021 no sound

Nope, no luck either, they don't have it, I am familiar with this good site. I've checked some Russian sites as well and I did not find it.

[madan1]

Re: pioneer vsx 2021 no sound

try here elektrotanya.com

[Clunche]

Re: pioneer vsx 2021 no sound

Very kind of you to provide this link, thank you. I downloaded the two manuals but unfortunately they are incomplete and very short (8 pages only each): no schematic diagrams of the boards found in the LX-55. Would you have another suggestion where to look? I have tried many different places unsuccessfully

[madan1]

Re: pioneer vsx 2021 no sound

You can download the service manual from here https://www.hifiengine.com/manual_li...vsx-lx55.shtml ( requires free registration )

[Clunche]

Re: pioneer vsx 2021 no sound

Hello, I own a second-hand VSX LX-55 which is similar to the VSX-2021 that you fixed. The issue is probably the same, I have no sound at all even in direct mode via the CD inputs. I have tried to locate the service manual but could not despite my many attempts. Would someone be kind enough to share a download link for this manual so that I can start tracking down signals on the HDMI board? Thanks a lot. Chris.

[dobrykamil]

Re: pioneer vsx 2021 no sound

I've got VSX-LX55 with the same issue-no sound. Looking for service manual. Anyone can help me out here?

Cheers.

[Nufus]

Re: pioneer vsx 2021 no sound

Thank you for links service manual.
I ve checked voltage supply and regulators are ok.
Main receiver shows version is displayed 1-204087***008
If I update firmware, only 20% stops and show error.
*** - ? chip DSP
I have to replace chip D810K013BZKB400 ?

[Piotr07]

Re: pioneer vsx 2021 no sound

Here you are ! Of course, registration is necessary http://**************/load/audio/vsx_lx55/5-1-0-52442

Limits do not allow to place such a large file in the forum.

[Nufus]

Re: pioneer vsx 2021 no sound

Would you by send manual another server?

[srt1]

Re: pioneer vsx 2021 no sound

No sound in all channel and tuner searching station but can not find AM FM stations . I bought a damaged secondhand.
When I will be service manual I will try to fix it.

http://smanuals.ru/manuals/home-thea...x-53-1326.html