It does look like one or both DSP chips have failed. They are quite cheap to buy on Ali and not too bad to replace depending on your soldering skill level.
The big problem is going to be getting a copy of the firmware from a good working unit. If you are lucky, Pioneer may have fixed this problem and it will accept a USB update once the working DSP chips are fitted. This didn't however work with my older LX86 or 56.
Post by andyb1712 on Sept 18, 2021 13:47:37 GMT -5
The D version chips are supposed to be the revised part but I don't know how long they last. Mine have done a few hundred hours use at most since repair. The original B chips in mine lasted up 30000 hours which I don't think is that bad.
Have you put your LX89 into service mode? That will show the hours it's been used for for before failure. The manual will tell you how to do this.
Post by andyb1712 on Sept 18, 2021 15:14:16 GMT -5
The lowest hours I've seen with UE22 failure is a US spec VSX-53 (same as LX55) that I bought cheap on eBay.
It was dead with a blown main fuse from being plugged into 240V instead of 120V. I changed the fuse and it powered up on 120V using a transformer but displayed UE22, so I heated the DSP with some flux and it works again.
That LX89 should not have failed at such low hours. It may have already been repaired by Pioneer and the life counter reset but this is still very poor.
The DSP chips in your LX85 are both BGA devices, which are harder to replace without problems, so I wouldn't attempt that until they fail.
The replacement D chips I've bought from China haven't looked like relabeled ones so far but some have not worked once installed. I've had to change them a second time. This is a risky process as the tiny BGA circuit pads are easily damaged after several attempts and lots of heat.
I prefer the later models like the LX86 now because the QFP chips are easier to change even with the big earth pad under them.
While looking at the schematic I noticed both DSP chips appear to have provision for a connector to allow direct communication, which may allow reprogramming of the flash memory without removal:
DSP1: CN9001 DSP2: CN9704
I've never done anything like this and wouldn't know where to start but someone else reading may be able to help? I believe this sort of thing has been done with some models of Onkyo receivers, so it may be possible.
docsss: Hi, HELP ! I really need firmware DSP2 Q3401 for ONKYO TX-NR3007 . [email protected]
Aug 29, 2021 11:47:32 GMT -5
timorenga: Gracias por aceptarme como miembro del foro, Estoy buscando manual de servicio para Denon AVR4310CI si alguien lo tiene se agradecería mucho que lo comparta Gracias
Jul 17, 2021 20:07:03 GMT -5