Help: Boss CE-3800D "Static and whining noise" - diyAudio
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Old 24th February 2014, 11:28 PM   #1
Itsme is offline Itsme  United States
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Question Help: Boss CE-3800D "Static and whining noise"

I purchased this amp non working and was told it was sent in for warranty repair's a month before it quit again. So I took it apart and found capacitor gut's all over the inside. They replaced all 6 of the 63v 1000uf's filters cap's and 3 input's and output transistors and didnt bother to clean up the mess left from the damage. Now I found most of the inputs and outputs fried so I have replaced them all, but now I am getting an high frequency pitch and static when amp kicks on. Would this be a bad inductor or possibly the driver board?
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Old 25th February 2014, 04:28 AM   #2
tiomilo is offline tiomilo  Costa Rica
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high frequency pitch sound comes from toroid or inductor coil ?? if comes from toroid is not big deal, just add some silicone glue to firm the cooper wire loose, if it comes from inductor could be shorted or have an issue in the bridge driver board, another symptom of static noise or may be toroid's copper wire lost its insulating layer and making short circuit between them, have to inspect visually inductor and toroid.
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Old 25th February 2014, 04:37 AM   #3
Itsme is offline Itsme  United States
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Thanks for responding. I inspected the toroid and inductor coil's but can not see any shorts or arcing. Is there any way to test them with multimeter or oscilloscope?
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Old 25th February 2014, 04:46 AM   #4
tiomilo is offline tiomilo  Costa Rica
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specific inductor coil tester, btw where the noise come from ??
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Old 25th February 2014, 04:56 AM   #5
laplace is offline laplace  Australia
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Is the noise coming through the speakers or directly from the amp?
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Old 25th February 2014, 04:59 AM   #6
Itsme is offline Itsme  United States
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Amp comes on and works but just have static noise and high pitch whine from speaker.
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Old 25th February 2014, 05:20 AM   #7
tiomilo is offline tiomilo  Costa Rica
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mmm so weird , low pass filter have to limit the high frequency to speakers, those four brown caps near speaker output after inductor coil. and could come from preamp sector
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Old 25th February 2014, 05:30 AM   #8
Itsme is offline Itsme  United States
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That is what I thought, being a mono sub amp with low pass x-over, should not have high frequencies. Should I rewind inductor coil then?
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Old 25th February 2014, 06:03 AM   #9
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Quote:
Originally Posted by Itsme View Post
That is what I thought, being a mono sub amp with low pass x-over, should not have high frequencies. Should I rewind inductor coil then?

maybe you should play the amp and try to touch the coil of the output inductor or move it a little, check if whinning reduces or increases. You will have an idea if this inductor has something to do in whinning.

Or if you have scope locate the frequency of the whinning sound compare it with the frequency of the power supply or of the driver board.

Last edited by nonprof; 25th February 2014 at 06:06 AM.
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Old 25th February 2014, 08:44 AM   #10
Itsme is offline Itsme  United States
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Ok, I tried moving and tapping on the coil and it does cause the static or Hum to fade in and out, but it kinda does this all over the board. It seems like it gets quiet the closer i get my hand to the inductor and some other areas of the board. I think I will go ahead and re-wrap the inductor since I have everything anyway and I will report back what happens.
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