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Old 2nd November 2007, 11:14 PM   #11
AKN is offline AKN  Sweden
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Hi Dougie085,

How’s your speaker terminals isolated from the chassie?
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Old 2nd November 2007, 11:17 PM   #12
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That was my first thought so Pulled them off the chassis but still have the same problem. The amp board thats barely working is getting the same signal as the other and the voltages are the same.
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Old 2nd November 2007, 11:25 PM   #13
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When I don't play anything it sounds like it's picking up a radio station. When nothing is connected to the inputs its silent not even a hum.
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Old 3rd November 2007, 12:44 AM   #14
defect9 is offline defect9  Ireland
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have you tried a different source or preamp, or even a different output from the same source (I ask because I use my DVD player as my CD transport and have several different outs, all which have varying levels of noise).

also switching left and right rca channels should tell you if it's the amp boards or the source

-Jared
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Old 3rd November 2007, 12:46 AM   #15
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Well thats my second concern right now. First on the list is to get both channels working correctly. Which one of them is not its very low. I'm really not sure whats going on? I checked the wiring everything seems to be connected correctly. I switched the RCA's and same thing. I believe its the amp board and I'm suspecting its a component. Maybe the chip it self?
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Old 3rd November 2007, 12:54 AM   #16
defect9 is offline defect9  Ireland
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when you switch left and right channel RCAs connected to the amp, does the quieter channel switch as well, or is the same one quieter no matter what?

-Jared
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Old 3rd November 2007, 12:55 AM   #17
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Same one is quieter. I think it may be a problem with that baord. I'm suspecting its a component. Maybe the chip it self?
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Old 3rd November 2007, 01:00 AM   #18
defect9 is offline defect9  Ireland
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okay, at least we can rule out the source for that.

Perhaps removing the board and touching hot iron to each of the joints to make sure they're solid. This will give you a chance to closely inspect each of the components for any signs of fault, like browned resistors or something. I know I'm pretty much saying everything that you're probably already going to do, but I cant think of much else with my limited knowledge at this point.

its probably just a fluke bad part, based on what I'm reading. I'd hate to think it's the chip, though if it is, at least they're not $50 each.

-Jared
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Old 3rd November 2007, 01:04 AM   #19
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Been there done that I just pulled the bottom plate off the chassis and flipped it over and then went and resoldered every part on the board. Still didn't help. I'm guessing part of the noise feed back could be the amp board feeding something back into the PSU setup There aren't many parts maybe my friend has extra. I'm sure he doesn't have an extra LM3875 though. How much do those cost? I could probably just order all the parts for one board and that should fix it no matter what lol.
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Old 3rd November 2007, 01:08 AM   #20
defect9 is offline defect9  Ireland
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short of discovering something with the power supply not outputting enough power to the board, I think getting all the parts for the channel and starting over might be a good idea.

the chips arent that expensive. I can't quote exact numbers, but I think i've seen them on ebay for something like $5-$6, and you can get them through better sources, if i recall, for probably cheaper.

-Jared
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