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Old 13th January 2009, 03:14 AM   #1
s800 is offline s800  United States
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Join Date: Jan 2009
Default Repairing Cinema Grand - half waveform

Hi all,

Trying to repair a bad channel on a Sunfire Cinema Grand. Before I start desoldering the boards to really get at them, I thought I'd ask the gurus here if they've seen something like this before.

Basically all but one of the channels are fine, but the bad channel is only showing a half waveform; anything above ground is dead. I've posted some pics here:

Link

As much tracing as I can do shows the full waveform through the opamps and on filter caps, so it must be near the output. Any thoughts?

Thanks!
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Old 13th January 2009, 12:13 PM   #2
acid_k2 is offline acid_k2  Italy
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Join Date: Oct 2006
s800,
probably you have posted a thread in the wrong section of the forum.

About your problem: try to check output transistors and relative driver transistors.
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