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Issue Placid BP, one power rail went out
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noviygera  
#1 Posted : Monday, January 19, 2015 5:18:59 AM(UTC)
noviygera

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Hi,

As I was listening to music, one of my Placid BP power rails went out. There was a slight burning smell, although nothing blew up or looks fried. So I have my +17v but -17v is now at -2.4v. Now, as I power it up, only one side of heat sinks is warm.

Where should I start to troubleshoot?

thanks for any help.

Herman
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miero  
#2 Posted : Monday, January 19, 2015 12:39:05 PM(UTC)
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Which Placid version?

If it is Placid HD BP 2.1, then check this
http://twistedpearaudio....ge--2-8V-at-startup.aspx
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noviygera  
#3 Posted : Monday, January 19, 2015 5:50:53 PM(UTC)
noviygera

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It is version 2.1

I think something actually burned out because this happened shortly after I switched over to a bigger transformer (same output voltage).

I was listening to music, the Placid was getting pretty warm, not super hot. Then one rail went out. Maybe I was shunting too much current...

Which parts burn out in this case, how to I check them?

thanks,
Herman
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Russ White  
#4 Posted : Tuesday, January 20, 2015 1:10:45 AM(UTC)
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Parts I would suspect first:

QP2/QN4

QP1/QN3

If you replace things make sure to change R8(A and B) to 200-221R
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noviygera  
#5 Posted : Thursday, January 22, 2015 5:36:42 AM(UTC)
noviygera

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Thank you. Will do that and let you know if it solves the problem.
Herman
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