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Post by xXFREDBERTXx on Sept 17, 2021 18:38:30 GMT -5
Ok X1501 is on side B of the HDMI Board good to know.
That is not a problem I solder and just put this cable out to measure that should work.
But DSP1 PIN80 is much easier.I will measure it and give you notice.
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Post by Deleted on Sept 18, 2021 6:03:23 GMT -5
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.
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Post by xXFREDBERTXx on Sept 18, 2021 12:17:20 GMT -5
I have measured Pin80 times with my oscilloscope well these are not meaningful values for me because it is a cheap part ...
Yes, I also assume that one of the DSP chips is defective.
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Post by Deleted on Sept 18, 2021 12:47:41 GMT -5
As long as you could see a clock signal present on pin 80 with a reasonable level and regular waveform, then X1501 is probably OK too.
I've not heard of the Cirrus Logic (DSP1) chips failing but the TI one (DSP2) is a later version of the ones in my LX86, so it could be the problem.
Unless someone else with a working 79/89 makes a copy of their working memory chips then this repair may be very difficult.
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Post by xXFREDBERTXx on Sept 18, 2021 13:25:13 GMT -5
Replacing the DSP2 shouldn't be a problem because I suspect a bug.
It is the last D version but these will also be defective ...
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Post by Deleted 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.
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Post by xXFREDBERTXx on Sept 18, 2021 14:30:28 GMT -5
30,000 hours for a B chip is really not bad.
Yes that would be interesting how much the D chip has already run good idea.
I'm not at home today, so I won't be able to look until tomorrow.
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Post by Deleted on Sept 18, 2021 14:53:29 GMT -5
I had a look at the photos I took of some of my repaired units with B and C chips.
VSX-922, 23000h
VSX-2021, 26000h
VSX-LX55, 33000h
SC-LX56, 27000h
SC-LX86, 36000h
30000 hours equates to well over 3 years use, 24 hours a day.
I have repaired a lot of Panasonic plasma televisions and most of them don't last that long before failure of the Y-SUS board.
One of my LX86 has 17000 hours and is still working with the original C version chips. I bought that stuck in DC protection mode and released it by pressing two buttons on the front panel!
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Post by Deleted 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 had 17000 hours logged.
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Post by xXFREDBERTXx on Sept 19, 2021 7:50:40 GMT -5
I called up this service mode in the amplifier to see how many operating hours are on it. What can I say is not a lot and already UE22 errors ...
I tried to install a firmware update in this service menu, unfortunately exactly the same update breaks off at 60% ...
My brother and I both have a SC-LX85 with D810K013B chips, these have 9000 & 12000 hours each, but both amplifiers have a 60mm fan over both DSP's chips as a preventive measure.
How long do they last on average?
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Post by Deleted on Sept 19, 2021 8:23:16 GMT -5
Wow, that is the lowest hours I've seen on any Pioneer receiver with UE22 failure! It may be someone has reset the count??
I would say on average the ones I have that use the same DSP chips as your LX85 have been between 25000 and 30000 hours before failure.
None of those have cooling fans other than the factory fitted ones by the main amp heat sink. I don't think these chips run very hot anyway.
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Post by xXFREDBERTXx on Sept 19, 2021 8:58:35 GMT -5
Also find that this is extremely little ...
The previous owner bought this amplifier from Saturn as an exhibit in a large electronics store here in Germany.
He gave me the bill from October 2016 of over 1400 €.
The amplifier is built in October 2015.
Maybe Saturn sent this exhibitor to Pioneer for repairs?
That is at least a house number what these B DSP chips hold before they become defective in our SC-LX 85.
It makes little sense to swap these for D DSP chips because they are all relabeled chips on Aliexpress anyway, you buy a pig in a poke ...
As I said, the fan over these two DSP chips is only intended as a preventive measure because this case has already warmed up well without a fan ...
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Post by Deleted on Sept 19, 2021 9:40:03 GMT -5
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.
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Post by xXFREDBERTXx on Sept 19, 2021 14:53:41 GMT -5
I also suspect that the amplifier has already been repaired by Pioneer. I also find it really weak, not even 1500 hours and defective again ...
Yes, these are both DSP BGA devices on our SC-LX85, and I will not replace them prematurely as long as they still work.
I once bought two DSP chips D810K013D from Aliexpress, both of which were fake sanded off and re-labeled.
Of course they didn't work either ...
Well, whether BGA or QFC both do a bit of work to swap these that's true.
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Post by Deleted on Sept 20, 2021 8:39:37 GMT -5
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.
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