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Post by xXFREDBERTXx on Sept 13, 2021 6:43:10 GMT -5
Hallo,
I bought a defective SC-LX 89 on ebay yesterday.
According to the previous owner, it was the well-known UE22 bug. He tried a firmware update which supposedly went wrong.
This firmware is currently installed
A renewed attempt to update this with the correct firmware with USB stick fails every time at 60% with error code 1 in the display.
An attempt to do this update via LAN / WLan always aborts with error code 7
What I have already tried is to heat this DSP chip with flux in the hope that this will work.
I suspect that something in the software is corrupted by this faulty update attempt.
Is there somehow a possibility to bring this high-end amplifier back to life
Regards from Germany
xXFREDBERTXx
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Deleted
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Post by Deleted on Sept 15, 2021 8:20:58 GMT -5
This sounds like the DSP firmware has got corrupted in IC9004 and maybe IC9704 as well. This may have been caused by a failed or failing DSP chip or just a glitch when the update was taking place.
The only way I am aware of to fix this is to remove the two flash memory chips from a working model that uses the same chips, LX59/79/89 and copy them to the ones in yours.
The way I fixed my LX86 probably won't work as your 1st DSP is a Cirrus Logic and the 2nd is a Texas Instruments. The LX86 uses two identical TI devices so the first part of the code that gets corrupted is the same.
You have two problems... finding a working LX59/79/89 and then persuading the owner to let you remove the DSP memory chips to copy them.
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Post by Deleted on Sept 15, 2021 8:25:04 GMT -5
Heating the DSP chip in this model is unlikely to help. It is the later 'D' variant and shouldn't suffer premature failure. It's also unlikely to have solder joint problems as it's not a BGA device like the earlier models had. Reloading the firmware from USB won't fix this in my experience once the DSP memory is corrupted.
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Post by xXFREDBERTXx on Sept 15, 2021 11:50:20 GMT -5
Hallo andyb1712
Yes, according to the previous owner, the device also had this UE22 error / DSP problem.
I suspect the DSP chip is defective and unfortunately both memory chips were carried away during the update.
Yes, unfortunately, two different TIs are built into the SC-LX 89, which doesn't make it any easier to search for.
As far as I understand correctly, I only need 2x working flash memory chips, regardless of whether SC-LX 59/79/89.
Couldn't one simply rewrite my two corupten flash memory chips with a suitable programmer?
I only re-soldered the soldered connections on the DSP chip because they didn't look so nice anymore, I had nothing to lose anyway and could have worked afterwards.
Thank you for your efforts and all information
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Post by Deleted on Sept 15, 2021 12:45:42 GMT -5
You need to know if the UE22 happened before the failed firmware update or not.
If UE22 appeared first then the DSP processor is probably faulty. If not then it may just be the flash memory corrupt from a failed update.
Whatever the problem you need a copy of firmware from a good working 59/79/89 receiver.
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Post by xXFREDBERTXx on Sept 15, 2021 13:50:33 GMT -5
Yes UE22 is happened before this firmware update.
So ist is possible that i change the DSP an the Amp works again?
Or i need also the Firmware from a working one.
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Post by Deleted on Sept 15, 2021 14:10:59 GMT -5
This is difficult for me to answer because I've not worked on this model. It has DSP chips from two manufacturers.
Before changing the processors, power the receiver up for 5 minutes and see if both chips are warm to touch. If not, check the voltage regulators that supply power to them. It may just be a small regulator failed.
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Post by xXFREDBERTXx on Sept 15, 2021 14:31:12 GMT -5
I check it for 5min and both TIs are Stone cold. The only Chip That heats up is the Marvel Chip on the Board. The Coils on the Board have all Power around 1-3Volts.
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Post by Deleted on Sept 15, 2021 14:49:11 GMT -5
Do you have the service manual for the LX89? You can find it by Google under SC99.
The schematic for the main digital board shows all the voltage regulators on page 12/12 for that board.
I would check all the regulators are working before replacing either DSP chip. The manual shows DSP1 as a Cirrus Logic and DSP2 as TI.
Both were parts that came after the known premature failure that was common to Pioneer and Onkyo.
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Post by xXFREDBERTXx on Sept 15, 2021 15:06:52 GMT -5
No i dont have the service manual for the Amp.
Do you have a link to the page?
Otherwise I would just buy this DSP chip on Aliexpress for 12€ with shipping and see if it works again afterwards.
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Post by Deleted on Sept 15, 2021 15:19:40 GMT -5
You need to search for RRV4617 and ARP4004. They are both available for free download at Elektrotanya.
The DSP chips are not easy to replace because of the large ground pad under the chip. You need to be 100% sure they have failed before removing them because of risk to damage to the board.
I carefully cut all the pins along each side with a new scalpel blade and remove them before heating the chip with a heat gun to remove it.
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Post by xXFREDBERTXx on Sept 15, 2021 15:27:36 GMT -5
Thank you very much for all the help!
Tomorrow I'll take a quiet look to see if the board is still okay.
And thanks for this note when removing the DSP chip, the board should remain intact afterwards, that's true.
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Post by Deleted on Sept 15, 2021 16:08:30 GMT -5
If you decide to remove the DSP chips, use a new scalpel blade to gently score the chip legs close to the chip body. Only use light pressure until the blade breaks through each leg which will take 4 or 5 goes each side.
Take your time so not to break through to the circuit board tracks below. Once all four sides are cut, put liquid flux around all pins and run a fine tip iron along to take them all off.
All that leaves is the chip body held by the ground pad underneath. Use a heat gun and concentrate the heat in the middle of the chip for about 90 seconds to free it.
The new chip will need solder paste put under to connect the pad and I heat that after soldering all the outer legs.
Hopefully you won't need to do this process!
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Post by xXFREDBERTXx on Sept 15, 2021 16:24:07 GMT -5
Yes that shouldn't be a problem I'll probably take a dremel and carefully cut the pins off.
Flux and solder paste are also provided so it shouldn't fail.
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Post by Deleted on Sept 16, 2021 9:36:12 GMT -5
A dremel will do the job much quicker but I wouldn't want to slip with it as it will also do a lot of damage to the tiny components around the chip if you do.
I would make sure the power to both DSP chips is present and the correct voltage first. Then I would try to get a good copy of the DSP firmware from a working receiver. The small flash memory chips are easy to remove, erase and rewrite if you have access to a EEPROM programmer.
I found the UE22 error goes away once the flash memory gets corrupted from a failed USB update. Correcting the flash memory will either get it working or restore the flashing UE22. If that happens then it's time to change the DSP chips.
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