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Post by Deleted on Sept 17, 2021 10:25:02 GMT -5
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Post by tibimakai on Sept 17, 2021 10:29:43 GMT -5
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Post by Deleted 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. |
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Post by xXFREDBERTXx on Sept 17, 2021 12:17:03 GMT -5
So just got in from work. I downloaded the file to my USB stick. Unfortunately, the update also stops at the same point at 60%
But it was worth a try, so continue with troubleshooting.
Thanks for this link from avsforum.com I will look at this time there are also a few pages of reading material.
Today I found a working SC-LX89 on ebay for over 1000 €, but that's a bit too much for me to unsolder and read out the flash memory chips there 
It's great that you got your VSX-2021 back 
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Post by Deleted on Sept 17, 2021 12:38:44 GMT -5
I didn't think it would be that simple but as you say, worth a try.
I've fixed:
VSX-922 x2
VSX-2021
VSX-LX55 x2
SC-LX56
SC-LX86 x2
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.
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Post by xXFREDBERTXx on Sept 17, 2021 15:13:06 GMT -5
I took another look at the HDMI board and need a little help, please sorry  I also printed out the circuit, but unfortunately I don't really understand it.
I found IC 9513 but where is this 3V3?
IC 9514 also found but where is 1V3?
IC9518 are printed on the Board but where is it and 1V0?
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Post by Deleted on Sept 17, 2021 15:38:16 GMT -5
3V3 is supplied to both DSP1 and DSP2 from IC9513 pin 4.
You can measure this voltage at L9003 and C9005 for DSP1 and at L9702 and C9748 for DSP2.
1V3 is supplied to DSP2 from IC9514 pin 1.
You can measure this voltage at L9701 and C9747.
1V0 is supplied to DSP1 from IC9518 pin 5.
You can measure this voltage at L9002 and C9004.
If these 3 voltages are present then the DSP chips are receiving power.
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Post by xXFREDBERTXx on Sept 17, 2021 15:44:45 GMT -5
So quickly you can find the points to measure without this HDMI board in front of you amazing.
I'll get in touch if I've found out something.
I thank you again for your quick help.
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Post by Deleted 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!
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Post by xXFREDBERTXx on Sept 17, 2021 16:19:16 GMT -5
I check it and the Voltage are:
IC9513 3,3V
IC9514 1,28V
IC9518 Not found but on L9002/C9004 are 0,98V
Is that ok or anything to low?
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Post by Deleted on Sept 17, 2021 16:28:25 GMT -5
That all looks good and it would seem one or both DSP chips have failed and the firmware got corrupted when the previous owner tried to do the update as a fix.
Replacing the DSPs would have got it going again but now it will need the DSP memory fixing too.
It's also worth checking clock signals to the DSP chips but you will need an oscilloscope for that. I've not looked to see if they use a crystal or clock generator chip.
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Post by xXFREDBERTXx on Sept 17, 2021 16:36:34 GMT -5
Ok so the tensions are ok so far, that's not bad, one less problem.
Yes, one or even both DSPs will be defective.
You can't tell in UE22 which one is affected, right?
I have an oscilloscope but only a mini part is the size of a cell phone.
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Post by Deleted on Sept 17, 2021 17:07:32 GMT -5
The voltage supplies do look good.
DSP2 has a 24MHz crystal connected directly to it and that is unlikely to have failed.
DSP1 gets it clock signal from a crystal oscillator module and this may be worth checking.
It is on page 8/12 of the digital main board schematic. X1501 is the oscillator that provides 24.576MHz to DSP1.
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Post by xXFREDBERTXx on Sept 17, 2021 17:13:10 GMT -5
Ok i can check it that is not a problem.
Can i find the X1501 or is that difficult to find?
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Post by Deleted on Sept 17, 2021 17:35:04 GMT -5
X1501 is on side B of the main digital board so difficult to access. The 24.576MHz clock signal from it should be on pin 80 of DSP1.
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