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Old 12th May 2011, 02:54 AM   #1
timwebb is offline timwebb  United States
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Default audio pipe 1500

ok i got this amp the neg side of the out put keeps shorting out. i checked the resistors they are good
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Old 12th May 2011, 03:42 AM   #2
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Can you post a photo showing a larger area of the board?

Do you mean that the output transistors connected to the negative rail fail repeatedly?
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Old 12th May 2011, 03:54 AM   #3
timwebb is offline timwebb  United States
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yes.they keep failing.
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Old 12th May 2011, 04:18 AM   #4
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That looks like a version of the massive/SinusLive amps.

Remove all of the outputs and short the positive and negative speaker terminals together.

What is the DC voltage for the high and low side FETs when you place the black probe on leg 3 and the red probe on leg 1?
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Old 12th May 2011, 05:48 AM   #5
timwebb is offline timwebb  United States
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5volts
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Old 12th May 2011, 06:49 AM   #6
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That's about what I'd expect.

Are all of the gate resistors within tolerance?

Are there any traces that could open intermittently?

Does the same FET on the low side blow every time or do they fail randomly?

Do ALL of the low side FETs fail (checked out of the board) EVERY time they fail?
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Old 12th May 2011, 05:20 PM   #7
timwebb is offline timwebb  United States
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Are all of the gate resistors within tolerance? yes.
Are there any traces that could open intermittently? no

Does the same FET on the low side blow every time or do they fail randomly? theyblow everytime.

Do ALL of the low side FETs fail (checked out of the board) EVERY time they fail? yes.
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Old 12th May 2011, 09:09 PM   #8
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It's odd that ALL 4 of the FETs fail at once. This would tend to indicate that the drive voltage is spiking.

Is the center leg of these 4 FETs directly connected (~0 ohms) to the output filter inductor?
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Old 12th May 2011, 09:16 PM   #9
timwebb is offline timwebb  United States
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no im getting a very high ohm reading
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Old 12th May 2011, 09:21 PM   #10
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Check the other 4 FETs (center leg to inductor).
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