I bought a “like new” 2013 Pioneer VSX-70 receiver for its DLNA capability, and of course, it’s broken… It all works, except the network and the front USB. So no firmware update and no DLNA or remote wi-fi controls. 😦
- Front USB has no power
- Network plug does is not seen by switch when plugged in and does not work (no power?)
- The network menu hangs, and it’s been reported by a few users on different models, like 2011 VSX-1021K or 2010 SC-LX83.
Setup>Network Setup>IP Address, Proxy
“A/V Receiver, Network Setup, Applying Settings”
I opened it and ID’ed the chips, eventually found the network processor, but more importantly the repair Pioneer Service Manual for VSX-1128-K, VSX-1123-K, VSX-70 and VSX-1028-K. (see elektrotania or esi).
This project will possibly push me into getting a $25 DSO138 1MHz/1 probe oscilloscope or a 24MHz/8chan logic analyzer, or a SainSmart DDS120?
I had a long brainstorm with Loial on Telegram and he is much more experienced than me, and from photos could figure out stuff I spent hours looking up on schematics.
- I am assuming the SMSC LAN8720Ai RMII chip is not at fault, since the USB is failing, unless bad power or interferences from it bother the main network processor chip. Except blogs of failure indicate possible slow fail of network that might be around that chip.
- The Microchip DM860A network processor lacks documentation, but clearly controls all the network activity and USB data activity. It is an ARM9 FPGA at 240MHz, with a 24MHz quartz.
- 3.3V NWK rail from large buck converter
- 1.8V NWK rail IC9502
- front USB protection (there’s a chip and a zener), try to unplug it.
- control signal from CPU that disables stuff (buck converter has the NWK_EN true)
- DM860A BGA may need to be re-fluxed or re-beaded.
If I ever come to figure it out this blog will go from random blabber to actually useful infos.