Calling out for help from all the electronics engineers/people out there who have successfully replaced the DSP chips!! Really need some help.
About 3 years ago, I shelved my Pioneer SC-LX85 receiver due to the UE22 Error and no having sound. I also ended up losing my HDMI inputs, whereby
my device will recognise that it's connected to the SC-LX85, but the receiver does not light up the blue "HDMI" lamp. I had assumed this was also an ill effect of the bad TI chips and that replacing them would solve all my problems...not so fast.
Only recently, I was able to obtain the revised "D" version of the TI DSP chips and I have replaced the old chips with them. I ran the software version check to see if I was getting any "***" errors from the DSP's but all version numbers have showed up correctly so I thought I was out of the woods and everything would work.
Sadly, even though the CPU is talking to the DSP's and BridgeCo just fine, I am not getting anything from the HDMI inputs. No blue light from the front panel, or speaker icons on the Fluorescent Display either. The strange thing is that if I hook up my PC as an input via HDMI, the computer can see the SC-LX85 as a display and audio device, implying there is some kind of successful handshake between the two devices, but the receiver fails to display anything through either of the two HDMI OUTs
The On Screen Display/Menu on my TV/Monitor works just fine and the optical connections work fine which kind of tells me the HDMI transmitter chips are working fine (SII9136CT) - I can send a PCM/DTS/DD signal thru optical and I get sound from the receiver! Does this confirm that the replacement chips are doing their thing?
As we know on the SC-LX85 there are two identical DSP's. It's been said that one chip does the Standard Definition decoding and the other does High Definition decoding. Is this 100% confirmed? What happens if one chip works and the other doesn't? I played around a little with this and removed the primary DSP (IC9002) all together and powered on the unit. I can confirm that the asterisks "***" appear when trying to read the firmware version for the DSP section and that I cannot process any audio from the optical inputs, no PCM, DD or DTS. I haven't tried this with the second chip but could a badly soldered chip affect the HDMI inputs from establishing a connection? Has anyone experienced this with with a bad reball/reflow?
I know that the units "Auto" selector function works, as on the VFD there is a small illuminated box that switches between "Digital, HDMI and Analog" depending on what has been connected to the input. When I connect my PC up, this box automatically jumps from Analog to HDMI.
TLDR: I'm out of ideas as to why my receivers HDMI inputs are not working. The unit can process DTS and DD via optical in, but absolutely no sound or video from the HDMI inputs - No blue HDMI light. OSD/HMG works. Do you think I have not soldered one of the DSP's on properly or is there another underlying issue. If you think there is an underlying issue, any ideas? P****d off that Pioneer isn't helping anyone out in the UK...!
Pioneer Kuro KRP-500A (voltage tweaked)
B&W CM9 (bi-amped), CMC2 (bi-amped), KEF Q35.2 (rears), B&W DB1
HTPC > Q6600 @ 3.6Ghz W/C, ASUS P5Q PRO, 8GB Corsair XMS2, AMD HD6970 W/C, OCZ 60GB SSD, 160GB WD Blue HDD, Pinnacle 7010ix, Corsair TX850W, Pioneer BDC-202BK, Zalman HD160+
Last edited by randomrat; 05-19-2019 at 04:54 AM.