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Old 29th September 2012, 06:37 AM   #31
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Its strange right now I have no DC on the output but if I touch a dummy load the DC increases and I still have no output. If I touch my scope lead to the + terminal its really hazy like there is dc.
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Old 29th September 2012, 06:50 AM   #32
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Ok wierd when I switch the l+r or l mono switch the amp shows output but slightly distorted. As I increase the volume R329 starts sparking on the board???
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Old 29th September 2012, 07:01 AM   #33
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I have found a broken trace from the positive speaker terminal then to the pad of C122 and from there to R191. Could this be the whole issue?
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Old 29th September 2012, 07:02 AM   #34
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Does it have a bad solder connection?
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Old 29th September 2012, 07:04 AM   #35
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post #33 please read
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Old 29th September 2012, 07:06 AM   #36
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I don't see R191.

You posted while I was typing. I left it. I didn't see any point in deleting it.
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Old 29th September 2012, 07:09 AM   #37
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Here is a pic of the broken trace I think thats what was sparking under the other components, you can see now that I removed the components.
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File Type: jpg 250M broken trace 001.jpg (981.1 KB, 30 views)
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Old 29th September 2012, 07:23 AM   #38
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did you look at the pic I posted?
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Old 29th September 2012, 07:24 AM   #39
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I don't see R191 on the diagram. It may have been omitted.

If the Zobel network R329 and C122 are out of the circuit (broken trace), that could cause some noise issues.

Does the noise subside when you repair the trace and connect a speaker?
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Old 29th September 2012, 07:27 AM   #40
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I will repair it and let you know, R191 is in the pic and it had a 1000 ohm resistor in place before I removed it. All of the bare pads in the pic had resistors in place except for C122 of course which had a ceramic capacitor. R191 was marked 103 which should be a 1000 ohm correct?
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