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Post by Deleted on Sept 20, 2021 12:48:42 GMT -5
  The chips I bought from China so far haven't looked like they have been sanded and relabeled or are salvaged parts. I may have damaged some of the BGAs fitting them as they take quite of lot of heat to solder down. |
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Post by xXFREDBERTXx on Sept 20, 2021 15:39:04 GMT -5
That would be really practical so you would never have to unsolder these flash memory chips again!
The soldering pads for it can also be found on my Pioneer, so soldering small cables or even a connector on it would not be an issue.
Your DSP chips look original as far as I can tell!
Had the problem with two D810K013D but at least got my money back ...
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Post by Deleted on Sept 20, 2021 16:19:01 GMT -5
It would be a good option but without some knowledge of how to interface with the DSP and have firmware in the correct format to load, it will be difficult to proceed.
The D variant chips in my photos were checked and compared to original B/C ones under a microscope and I couldn't see any signs they had been tampered with.
So far they are working fine in my 55/56/86 and my 86 is in daily use as my main audio system. It's still only at hundreds of hours use though, not thousands. If they last as long as the originals I'll be quite happy!
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Post by xXFREDBERTXx on Sept 20, 2021 17:00:31 GMT -5
Yes, that's true again without the right software / hardware you couldn't tackle anything on these DSP soldering pads anyway ...
Yes, your DSP chips looked original in your pictures.
Do you always exchange both BGA or QFC DSP chips with these Pio's?
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Post by Deleted on Sept 21, 2021 1:25:01 GMT -5
Luckily for me, my Pioneers with BGA chips (LX55, VSX2021) have only had one device fitted. The LX56/86 models have 2 x QFP chips and I changed both in all 3 units I've repaired. It's hard to tell if one or both has failed and they are quite cheap to buy. it also saves taking the board out twice. I don't think I would like to try a fix a dual BGA model like your LX85!
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Post by Deleted on Sept 21, 2021 1:39:03 GMT -5
 The QFPs can be difficult to remove too because of the big ground pad underneath. They need a lot of heat to remove and a lot to fit back. |
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Post by xXFREDBERTXx on Sept 21, 2021 17:42:41 GMT -5
You are really lucky that your BGA Pio's only had one DSP chip.
Your chance of success with these repairs is not bad at 100%.
Yes, that's right again, these DSP chips are really really cheap. Better to renew both at the same time than expanding the HDMI board again doesn't get any better.
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Post by xXFREDBERTXx on Sept 21, 2021 18:37:22 GMT -5
Soldering these DSP chips shouldn't be a problem. I have a hot air station and an infrared BGA rework station here at home.
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Post by Deleted on Sept 22, 2021 1:24:14 GMT -5
It's good you have the right equipment to rework the chips. That is half the problem solved.
To your LX89... do you have a programmer to read the two flash memory chips? I think this is the next thing to do before your replacement DSPs arrive.
You need to see if either have been partially or fully erased by the firmware update attempt. My LX56 1st DSP was blank at address 0-10000h. The 2nd DSP was intact.
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Post by xXFREDBERTXx on Sept 22, 2021 8:49:53 GMT -5
Yes, I bought the equipment for my company, otherwise I repair graphics cards professionally. I have a MiniPro TL866CS programmer for which I have an adapter for TSOP32/40/48 here. I guess it should go with that right?
Or what kind of programmer do you have to read out?
Yes, these two flash memory modules could unsolder and read out, perhaps one of them is with errors.
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Post by Deleted on Sept 22, 2021 9:04:18 GMT -5
I have a TL866II Plus which is slightly newer programmer but yours should do the job.
The DSP firmware is in two 8 pin SOIC devices, which in the LX86 are located on the B side of the main digital board.
Easy to remove and read, erase, reprogram and solder back once you have a known working file to load. I would be interested to see what has happened to them.
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Post by xXFREDBERTXx on Sept 22, 2021 9:56:03 GMT -5
Ok yes the TL866II Plus was a bit too expensive for me back then ...
But the TL866CS should be enough for that too.
These 8 pin SOIC devices are no problem to read out just have to find the right ones... I found three of them on the back which two are exactly for DSP1 and DSP2?
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Post by Deleted on Sept 22, 2021 10:16:48 GMT -5
The ones you want are IC9004 and IC9704.
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Post by xXFREDBERTXx on Sept 22, 2021 10:43:11 GMT -5
Thanks  Yes IC9704 looks corrupt to my mind. Without a suitable, functioning firmware, of course, only speculation. IC9004 looks good to me.
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Post by Deleted on Sept 22, 2021 10:48:04 GMT -5
If you send me a copy of the two files I can also take a look if you want. I can compare them to the ones from my working LX86.
IC9704 is for the TI DSP, which is an almost identical device to the ones in mine.
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