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Old 10th December 2011, 03:28 PM   #1
m4ick is offline m4ick  United States
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Default Power Acoustik PS1-5500D

This had a shorted output in each bank and a blown power supply.

I replaced the power supply fets and the output fets and it powers up and is oscillating and the oscillation at the inductors looks nice. The strange thing is that the high side gets considerably warmer than the low side.

I looked at the gates on the high side and all looks well but when I look at the gates on the low side the drive signal doesn't have a flat top, it's more of a saw tooth, shouldn't the drive be flat?

If so wouldn't that be a PNP driver not pulling it up quickly enough?
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Old 10th December 2011, 04:10 PM   #2
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Find the point where the two inductors connect (they're in series). Look at the square wave signal level there. Is it precisely 1/2 of the amplitude of the square wave on the output transistors (drain or source, depending on the output transistor probed)?
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Old 10th December 2011, 04:23 PM   #3
m4ick is offline m4ick  United States
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Yes but with much heavier ringing on the top of the waveform than on the bottom.
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Old 10th December 2011, 05:37 PM   #4
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If you twist the inductors, does that reduce the ringing?
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Old 10th December 2011, 06:05 PM   #5
m4ick is offline m4ick  United States
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With all the twisting and turning I can muster it doesn't seem to make a difference. I tried prying with the back end of a pen and that didn't make a difference either.
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Old 10th December 2011, 06:06 PM   #6
m4ick is offline m4ick  United States
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Although, these inductors are glued to the board pretty well.
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Old 10th December 2011, 06:15 PM   #7
m4ick is offline m4ick  United States
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The outputs don't get too hot to touch or anything but on any successful amp repair I have ever done all of the heat sink mounted components (except voltage regs) stay nice and cold for at least a minute or two before you can notice ANY kind of warmth.

Not to mention the low side bank right next to the high side stays cold to the touch while the high side begins to warm up considerably.
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Old 10th December 2011, 08:33 PM   #8
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Where did you buy the outputs from?
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Old 10th December 2011, 08:42 PM   #9
m4ick is offline m4ick  United States
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Newark
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Old 10th December 2011, 09:03 PM   #10
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The high side drivers rarely fail.

This sounds like the type of problem that you have when you're using counterfeit outputs. Newark is a reputable distributor but I've received components that were not good from their sister company MCM.

Have you insulated the windings where they tend to short on the inductors to ensure that that was not causing any problems?
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