Question about Sony MHC-NX3AV Shelf System
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Posted on Jan 02, 2017
SOURCE: sony Mhc GS100 want power up
The unit is in protect mode because a problem was deteected in the final output stage of the amplifier. The pop in the speakers is a god indication that there is DC current in the output stage. This is not a good thing. This is a relatively common failure of all receivers and can easily be fixed by any shop that does audio repair. Expect a parts cost in teh $30-$40 range.
Posted on Aug 19, 2009
Sonys built-in protection against shorts in the speaker system - of course, like it was by my CMT - CPX1 - there's no problem at the speakers at all - this have to be insured! If everything with the speakers and the speaker cabling is ok it might be the soldering at the S-Master IC's. The S-Master Unit is Sonys Digital Sound System, you'll find inside two identical S-Master IC's srewed togehter on a heat sink.
I recognized that if I opened the system, it was running, touching sometimes the S-Master PCB, it shut down.
Solution: there's a bad / poor soldering at the S-Masters pins (probably because of the heat sinks!). I resoldered all S-Masters IC Pins - that's it - my system is running now.
Posted on Apr 21, 2010
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