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Post by ponczomarinero on May 30, 2013 18:16:27 GMT
Hello, My last chance is to ask you guys I have got problem with my old DAC. This is a Mission Cirrus Dac5. Made on TDA 1547 Dac chip. Few years ago starts making weird noise, like frying on a pan. When switching on is quiet and then after 20-30 seconds noise is coming louder and louder and then starts working normally. Now starting fine but plays music with sound like cracking protecting foil with some air bubbles. First I tought it may be a problem with capacitors. Exchanged old capacitors for new ones. Nothing happened apart of better SQ made by nichicon audio capacitors :-). Some power supply capaciotors been exchanged too. Interesting thing is when I stop playing music dac i quiet, when pushing play and sound is coming that cracking popping noise is coming again. I am not a profesional, has some multimeter and basic idea of ohm laws.
Anyone have some ideas? Thinking to exchange dac chip for new one. How to find out when and where that popping cracking sound is coming to the signal path. This is very old dac but still sounds superb and don't want to throw it away. Matt
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Post by PinkFloyd on May 31, 2013 18:47:49 GMT
Hi Ponco,
Welcome to the forum. Can you please upload a photo of the top / bottom of the PCB so we can get a general idea of the topology?
Many thanks,
Mike.
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Post by PinkFloyd on May 31, 2013 20:58:21 GMT
Never overlook the obvious....... check the RCA sockets, fire in "reflow" some solder into all joints.... are you sure it's the DAC? Check your transport / source / interconnects...... sometimes it's hard to see the wood for the trees.
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Post by ponczomarinero on May 31, 2013 22:07:43 GMT
I am suffering this problem from months/years. Have been checked connection already, but I will check again. One thing may be the small spdif to coaxial converter which is between airport and the dac or even its chip power supply. Still thinking why it is happening randomly or from time to time. In example, today evening it plays without any faults like never from months.
I will do some photos tomorrow because evening light conditions.
Dac has two boards, one for power supply and one with dac. I tried everything like moving cables, changing optical cables, bending boards etc. I haven't had anything to bypass this spdif to coaxial converter. I am using macbook as a source which has build spdif connector. Have no source with coaxial output. Changed dac allready it means amplifier (creek 4140) is fine.
I haven't tried anything with soldering or resoldering, maybe that is good idea. I will upload photos tomorrow and try re solder connections then. We will see what will happen.
thanx a lot Mike
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Post by PinkFloyd on Jun 1, 2013 10:29:49 GMT
If it only happens sometimes then it's possibly an intermittent problem with a "mobile" solder joint.... have a look at all the joints that connect the input / output etc. and move the components with your fingers whilst looking at the solder pads.... as I say, it's possible that one (or more) of the joints have become mobile.
Mike.
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Post by PinkFloyd on Jun 5, 2013 19:17:25 GMT
How are you getting on with it Ponczo?
Mike.
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Post by ponczomarinero on Jun 10, 2013 10:52:54 GMT
Hello again,
I couldn't find time to post anything. Got problem with car and been on welsh wedding :-) Let's come back to reality.
Resoldered some joints on dac, from the time of my first post here, everything plays nice an quiet. I have had just one moment when the noise come up for few second and gone. I have been thinking about that spdif ->coaxial converter which is cheap. Year ago I bought some MUSE tda 1543x4 dac from ebay. I found it has some coaxial input. What I will do I will connect that cheap spdif->coax converter to this different 1543 dac and will see how it behave. If noise comes up again it means that converter is faulty, if not it means my suspected dac is faulty.
Next possible element in chain to check is my Apple airport which may cause some noise. To remind my system looks like that:
Apple Airport -> spdif to coax converter -> Mission Dac -> Creek 4140 Amplifier
I tried to post some images but it says - forum exceeded some attachement space or something :-)
I need to find some way to upload images on server
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Jun 11, 2013 4:28:25 GMT
Hi You will need to use a free service such as ImageShack to post a Forum link . You can then click on the thumbnail to get a larger picture. When diverted to ImageShack, you can then click on the new picture to get a full size picture.
Alex
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Post by ponczomarinero on Jun 11, 2013 18:59:09 GMT
Thanx a lot Alex This way is much simpler ok then: Power section 1
Power section 2
DAC section 1
DAC section 2
Together
At the moment using my spdif->coax converter with different DAC and plays without scratches and pops. In next test use different dac + spdif/coax converter and Apple airport. if noise appers it will be airport if not will be DAC. Matt
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Duncan
Been here a while!
Duncan_Disorderly
Muhahaha
Posts: 15
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Post by Duncan on Jun 13, 2013 19:44:53 GMT
Might be a stupid question, but the crackling isn't from the PCB, but through your headphones / speakers, yes?
My gut feeling if I've read your initial post correctly is a dodgy hand-off from the Airport Express - I am using a Sony DVP-NS930V which does something not too dissimilar over optical when ejecting discs / powering on etc. when running through its digital outs (both Co-ax and optical)...
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Post by ponczomarinero on Jun 13, 2013 21:41:07 GMT
Hello,
I have something similar even during changing songs - some delicate pop, cracking sound.
But my dac suffering for some nasty cracking noise which sometimes last for few seconds or even more. This is very loudly continuous cracking noise.
By the way I am using my "broken" dac with spdif/coax converter and project sunrise and everything is ok. I will keep that system for a while to check that noise appear. If not it will be magic.
Matt
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Post by ponczomarinero on Jun 16, 2013 22:25:09 GMT
Yes... noise comes after few days of listening. On headphone amplifier sounds like breaking bubble protecting foil every few seconds. Considering age of that DAC maybe I should exchange all of electrolytic capacitors - most of them been replaced. How big probability is that TDA 1547 makes that sound?
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Deleted
Deleted Member
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Post by Deleted on Jun 17, 2013 0:03:21 GMT
You probably haven't much to lose by replacing the rest of the electros. I doubt that the TDA1547 is faulty, but I wouldn't rule out the possibility. Years ago, we found in Telstra that expensive logic I.C.s in data stores started to fail after about 7 years due to impurities in the manufacturing process, and it was speculated that this wouldn't happen if they were assembled in Space. Clean rooms are obviously better these days though. Regards Alex
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Post by ponczomarinero on Oct 10, 2013 18:34:32 GMT
Hello again,
Had a nasty treatment which keeps me far from audio pleasure for more than 3 months. Today decide to switch stuff again. This time my dac connected to my sunrise project . Like usually, popping cracking sound appears. I start moving cables again and found interesting thing. That small box (toslink to coax converter), when close it in a hand popping sound disappear. My God - so many months looking for source of nasty cracking sound and solution come on its own. Now is time to put mentioned converter to metal box instead plastic one and connect it to the ground :-)
Thank you everyone for some helpful ideas.
Matt
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