Audio Systems/IC replacement

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Expert: - 1/8/2009


Question
In reading/research my sony ste-de605 "protector" fix is to replace the IC's associated with the amp board. There are 2 IC's attached to the heat sink and the board, are these the ones to I need to replace( LM3875)? Or what  test can I do to verify id these are bad?
thanks
Ray

Answer
That is a high power (56 w) audio chip and could certainly be the one that has brought the rails down in the power supply causing the protect to activate.  There are two of them.

If you pull them out - or disconnect the B+ voltage to them the protect should not happen.  Connecting them back up will bring it down if bad.  Replacing them should correct the problem.  There are other potential causes, so I would check them carefully as outlined above.

C  

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Cleggsan

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Audio Design Engineer; systems, loudspeakers, cd/dvd players, etc. I am knowledgeable in all high end audio equipment and installations. MAKE SURE YOU GIVE A MAKE AND MODEL NUMBER AND CAR IF IT IS AN AUTO QUESTION. Note: I am getting some who ask good questions that take a lot of time to research but then the questioner fails to read the answer. Please don't ask questions unless you are seriously looking for an answer. If you find an answer to your question otherwise then let me know with your reply. Thank you.

Experience

Have been associated with audio design, standards, testing and component systems for over 40 years.

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Life Fellow Member of Audio Engineering Society Life Senior Member of Institute of Electronic and Electrical Engineers

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Review technical manuscripts for IEEE Spectrum Write occasionally for high-end audio publications

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BSEE/MSCS/MBA

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Past Employee/advisor to several well known audio products manufacturers

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