Sony CDP-505esD just outputting a lot of noise - diyAudio
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Old 8th September 2014, 03:05 AM   #1
diyAudio Member
Join Date: Jun 2012
Default Sony CDP-505esD just outputting a lot of noise

I got my hands on a CDP-505esD which is great (TDA1541!) and it seems to play and track with any CD but the problem is that the output is just a lot of noise. The noise coincides with the music (ie. no sound when there are supposed to be pauses in the music) and it comes from both the analog and digital outputs. The lens is clean and all the capacitors appear intact. Any ideas?
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Old 9th September 2014, 05:44 AM   #2
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Join Date: Oct 2006
This is a potentially common symptom of tda1541 failure, except that, in my experience, they generally go bad like this only one channel at a time. The two other most common causes are 1)a bad error correction ram chip(the whopping 16k circ memory) and 2)way less frequently, a bad signal processor chip, e.g. CXD2500.
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Old 9th September 2014, 04:46 PM   #3
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Thanks! I've ruled out the TDA1541 because the sound is the same when using the SPDIF output, which does not originate from the TDA1541. I will try replacing the RAM chip, though. If only it wasn't surface mount!
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Old 10th September 2014, 06:51 PM   #4
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Join Date: Oct 2006
Exactly right diagnosis. It's remotely possible it could be power supply caps for the dsp/ram, so you might get very lucky and find a bulging/leaking cap or significant ac voltage on the +5V dc line to indicate that. Really remote chance, but possible. Otherwise, this sort of fault requires trial & error of chip replacements, which means smd work in this case.
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