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Post by tjmotter on May 23, 2023 20:56:23 GMT -5
Thanks for your response, Todd. I've heard something about how D revision chips that are sold are really just B rev chips pulled from dead boards sanded off and reprinted. So my question now would be is anyone selling actual D rev chips pulled from dead boards? I'm finding a hard time coming across a dead board with a D rev chip and I wouldn't want to mess with putting unnecessary heat cycles on it which would increase my chance of ruining the chip. Especially since I don't even know whether it is the DSP chip or the FW inide of it that's gone bad. Onkyo had a repair program after this issue was first announced. While you will NEVER find a good new part on its own, you can pull the "D rev" chips off of other boards as has been suggested above. I have bought literally dozens of these chips and every single one was a scraped "B rev" so the only safe way to do this is to buy a bad HDMI board, pull the DSP off of it, reball it and then install it on your board. IIRC the solder balls are 0.60mm and are pretty easy to find on ebay. A reball is time consuming but I have done this over 50 times and it is the safest way to do this.
Things to look for on an Onkyo board from eBay: 1) if the DSP has a small white sticker on it that says "repaired", it is a good "D Rev" chip that was replaced by Onkyo - this applies to any HDMI board with this part on it including: NRx09 (eg. NR509/609/709/809), NRx1x (eg. NR515/616/717/818). These boards show up on eBay when the main amp blows and the user is stripping the unit.
2) if the board comes from a newer model like the NR525/626/727/828/RZ800 it will have a "D Rev" chip on it. Note that these boards do show up on eBay because they tend to have HDMI issues. Onkyo "overclocked" the HDMI chips in this generation and they are a weak point 3) if the board comes from the newer model like the NR636/737/838 it will have a faster "D Rev" chip but it will work. The original partnumber ends in a "4" which means it is running at 400Mhz. The chip on these newer models has a "5" at the end which means they are designed to run at 467Mhz but they will happily work at 400Mhz so you can use them as a direct replacement. Like the previous board, these suffer from HDMI chip failures so they do show up on eBay but they are highly desired because they can replace an 400Mhz chip as well as the older 300Mhz chip used in the NR708, NR3007 etc.
HTH Todd
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Post by user10298453 on May 25, 2023 8:04:45 GMT -5
Are these boards scarce on ebay or am I searching incorrectly? Are there any P/Ns that I should include for my search term? And something else that I'm concerned about removing the chip myself is whether or not I could damage them by putting too many heat cycles on it. I have a pretty good hot air station, microscope, and iron but I don't have a preheater and I'm not too experienced with BGA rework. And if I do find a broken board, could the D revision DSP have failed on it?
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Post by xXFREDBERTXx on May 25, 2023 9:17:06 GMT -5
First Todd great post again from you were these DSP’s are to find 😎
But with some thread reading’s on these Forum were these information also to find from you before ✌️
user10298453 you are not answered back we’re you are from and it seems also for me so you are not interested on my genuine already reballed B/D Revision DSP…
But no big deal than I fix other Onkyo Amps with these 🥳
And yes when you put to much heat on the DSP @ the removal/refit or even reball process for sure you can kill the Chip ☝️
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Post by mastertech on May 25, 2023 9:20:16 GMT -5
And something else that I'm concerned about removing the chip myself is whether or not I could damage them by putting too many heat cycles on it. I have a pretty good hot air station, microscope, and iron but I don't have a preheater and I'm not too experienced with BGA rework. Get a few junky boards with BGA's on them from something not worth fixing and experiment on removing the BGA's to learn and get use to the process. Maybe even try an install on a couple with new balls. I would never recommend attempting a first time removal and install on a hard to get part for a device you are wanting to repair. |
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