My beloved overture 3's are now making some strange high
pitched noises when I first start using them. When they
have been playing for a little while, the noises disappear
and they sound beautiful again. When I pulled the amp out
of them, I can see the black soot is on one side of the
circuir board and appears to flow in a direction on it.
Though there is no visibily damaged components. I am very
good with soldering and desoldering, but absolutely suck
at figuring out what component(s) to change out. I would
greatly appreciate any help.
Thank you,
pitched noises when I first start using them. When they
have been playing for a little while, the noises disappear
and they sound beautiful again. When I pulled the amp out
of them, I can see the black soot is on one side of the
circuir board and appears to flow in a direction on it.
Though there is no visibily damaged components. I am very
good with soldering and desoldering, but absolutely suck
at figuring out what component(s) to change out. I would
greatly appreciate any help.
Thank you,
Attachments
It may be dust, but it is a black charcoal when you touch it. It is in the front of the speaker at the bottom. It drives the subs in the speaker
With that much soot there would be obvious damage to something and you would definitely smell something burnt. It looks like a possible cracked solder joint on that big 5.1k resistor though.
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Looks like the MOV where your AC comes in. Saw this on old CRT's all the time.
for "economy" some OEM's will soft start with just a NTC MOV (metal oxide varistor) - no relay to finish.
AC current always runs direct though the mov.
I does have a relay - possible relay failure with all the current just going through the mov ??.
OS
for "economy" some OEM's will soft start with just a NTC MOV (metal oxide varistor) - no relay to finish.
AC current always runs direct though the mov.
I does have a relay - possible relay failure with all the current just going through the mov ??.
OS
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Process of elimination ... Either the outputs or the mov usually emit black sooty smoke.
He said it still worked . OP's did not blow.
But it works "funny" with high pitched noises. Hmmmm ? Rails sagging with a faulty
high Z mov is most likely.
OS
I can usually smell something when there's that much of a mess. Must not be stinky internals in an MOV.
I should probably replace those, or is there a way to test those? Also, went to the store and bought some puretronics freeze spray to help me diagnose, well, it manage to cause a massive spark and now the amp in the one I was testing will not provide power output to the subs. Any further ideas on this?
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