I have a Soundigital SD6500.1D amp that I’m working on that has some shorted output mosfets and I can’t identify them to order new ones. They are marked C1. Has anyone solved this riddle? All of the ICs on the board have had their markings removed as well. Can anyone supply a schematic for this or a similar amp. Thanks for your input.
David
By the way, the power supply mosfets are all marked H3.
David
By the way, the power supply mosfets are all marked H3.
Here are the photos of the board. I reached out to soundigital for some parts information and the they responded that they don’t sell parts and that they handle all repairs out of their Florida repair center. That’s nice.
Thanks for the offer of help Ultra.
Thanks for the offer of help Ultra.
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Just my 2 cents. Soundigital makes the AAB line of Deaf Bonce amps for Alphard Audio (the AAK line is a Korean design). I just happened to have a AAB amp brought to me to check out, and as luck would have it the authorized warranty repair guy for Alphard Audio is in one of my Facebook groups. He stated that even he cannot get support from Soundigital to repair the amps for Alphard and has to ship them to SD. The chips and Fets are all rubbed out in the Deaf Bonce amp too. I am sure someone will get leaked info or figure it out in the future, but until then my stance on companies that poo on repair guys is that I will go out of my way to NOT recommend their equipment.
Why isn't someone testing FETs to see what matches the original? There aren't that many possibilities.
Are the replacements for amps repaired by the authorized service centers also defaced?
Crazylogix:
Almost all of them refuse to support the repair community. With VERY few exceptions, a competent electronics engineer can reverse-engineer any amp in a day or less so the manufacturers are not protecting their designs. In a few years, there won't be anything to protect. Car audio is on it's way out. There will be a few collectors that will show interest but not many others.
Are the replacements for amps repaired by the authorized service centers also defaced?
Crazylogix:
Almost all of them refuse to support the repair community. With VERY few exceptions, a competent electronics engineer can reverse-engineer any amp in a day or less so the manufacturers are not protecting their designs. In a few years, there won't be anything to protect. Car audio is on it's way out. There will be a few collectors that will show interest but not many others.
When the Deaf Bonce gets repaired I will see if I can get a peek at it when it gets back.
Care to elaborate on why you think car audio is on its way out?
Thankfully I am not competent at anything, I can screw anything up with the best of them 🙂
Care to elaborate on why you think car audio is on its way out?
Thankfully I am not competent at anything, I can screw anything up with the best of them 🙂
A few years ago, I would spend 8 hours or more here a day answering questions. Now I can answer a weeks worth of questions in 10 minutes.
There used to be a LOT of people asking questions. Now, there are 4-5 regulars needing help with only a few others who drop in.
I know people with car audio shops locally and the ones still operating are just doing minor jobs (front'rear speakers and maybe a sub and small amp), for the most part.
My site (and others) used to have a lot of traffic. Now, it's a trickle (~1/10).
There used to be a LOT of people asking questions. Now, there are 4-5 regulars needing help with only a few others who drop in.
I know people with car audio shops locally and the ones still operating are just doing minor jobs (front'rear speakers and maybe a sub and small amp), for the most part.
My site (and others) used to have a lot of traffic. Now, it's a trickle (~1/10).
Crazylogix - I think i've seen You on the livestreams of barevids - NSV ?!
I've 11800AAB for a repair...with a burned hole in the mainboard, exactly where one of the output buffer driver/IC is located...I do have the schematics, but still have not managed to repair the amp due to some other issues with it which I still can not locate. Sound Digital have NOT responded to my e-mails.
I have the schematics from other source I cannot mention, but even in the schematics the are some components that are not being labeled at all like the output mosfets.
Back to the main question - the output mosfets are usually irfb4127, but marked as A3, C2 or something like this, a better one if you can fit are the IRFP90N20D.
The power mosfets are usually the IRF1404.
This is for the most part EVO series - Sound Digital, which is applicable to some of the Alphard AAB, Ground Zero SPL brazillian line amps and so on. They are actually Sound Digital amps just with different stickers and casing - that's all.
Hoped I helped and clarified a bit.
I've 11800AAB for a repair...with a burned hole in the mainboard, exactly where one of the output buffer driver/IC is located...I do have the schematics, but still have not managed to repair the amp due to some other issues with it which I still can not locate. Sound Digital have NOT responded to my e-mails.
I have the schematics from other source I cannot mention, but even in the schematics the are some components that are not being labeled at all like the output mosfets.
Back to the main question - the output mosfets are usually irfb4127, but marked as A3, C2 or something like this, a better one if you can fit are the IRFP90N20D.
The power mosfets are usually the IRF1404.
This is for the most part EVO series - Sound Digital, which is applicable to some of the Alphard AAB, Ground Zero SPL brazillian line amps and so on. They are actually Sound Digital amps just with different stickers and casing - that's all.
Hoped I helped and clarified a bit.
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