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Calling electronics gurus: help me fix this speaker/subwoofer set

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ChadTower:

Hrm... the speaker output circuit is probably analog, so I'm thinking there are some bigger caps and inductors in there.  I'd start with those since they are things that can degrade but not take the whole circuit with it.  Compare readings on them with the same circuit for the other speaker.  Clean up/inspect all of the removable connections, too, like molexes and header pin connections.  It's worth reflowing them all on principle.

EDIT:  BTW, how did you eliminate the op amp?  I don't know how to test those directly yet.  It sounds useful.


SirPeale:


--- Quote from: ChadTower on April 25, 2007, 10:52:37 am ---EDIT:  BTW, how did you eliminate the op amp?  I don't know how to test those directly yet.  It sounds useful.
--- End quote ---

It's not the most expensive speaker set in the world.  I figured the op amp might be the culprit, so I went looking for a replacement.

I found a pair of powered speakers in the attic I thought *might* have a compatible chip.  It didn't - it had the EXACT chip.  Since those speakers work just fine, I swapped it out.  The problem persisted.

Not the most technical way to do it, but it worked.  ;)

I've already done the usual reflowing of joints on the PCB.  Likely I could shotgun the entire board without much issue (other than actually tracking down the parts).

ChadTower:


Ah, so you pretty much know everything I could help you with, I think.  I was hoping you had learned some nice method for testing op amps.   ;D  I'm sure there is one out there somewhere.

BobA:

If your speaker set has a headphone or earphone jack try jacking a connecter in and out a few times to dislodge any dirt that might be on the contacts.   I have found that these jacks corrode over a period of time and mess up the speaker output since the signal goes thru them and they are really cheaply made.

Just to cover all bases try this will all the jacks and plugs in the system.

Chris G:

You're not testing with a white noise CD, are you?   ;D

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