Post by andyb1712 on Sept 17, 2021 11:27:48 GMT -5
This has been a problem with Pioneer AVRs since 2010 and was originally caused by the same TI DSP premature failure as that which plagued Onkyo AVRs from 2010 to 2013.
The SC-LX89 is a much newer model and shouldn't suffer with this but this isn't the first one I've heard of. I tried to help someone else resolve it with a SC-LX79 but in the end like many he gave up and sold it on eBay.
I emailed Pioneer about it in January this year when I was first trying to fix a VSX-2021 with the same problem and the response was they were unaware of it. I fixed that by replacing the 'B' variant BGA with the later 'D' variant and copying the DSP firmware from a working VSX-LX55.
All had the UE22 and/or no audio due to corrupt DSP memory and failed DSP processors. They are all much earlier models than yours and had the DSP chips that TI listed as defective for premature failure.
The DSP chips in yours are not in that list of parts, which was why I thought it may be a voltage regulator/power failure to one or both.
It's unfortunate that a firmware attempt was made by the previous owner as that has made your job more difficult.
Post by andyb1712 on Sept 17, 2021 15:52:50 GMT -5
I have the service manual on my mobile and had a look at the DSP power block and both DSP schematics.
You should be able to find these 3 voltages on the capacitors or inductors on the top side of the board. If any are missing then you need to follow the circuit back and check for voltage going into each regulator.
Pioneer like to put lots of voltage regulators in and it only takes one to fail!
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