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Old 18th February 2019, 01:00 PM   #21
Perry Babin is offline Perry Babin  United States
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Is the jumper soldered in the locations I described?
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Old 18th February 2019, 01:07 PM   #22
chrisg4 is offline chrisg4  South Africa
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no, i was afraid i might fry the hip4080 again...
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Old 18th February 2019, 01:10 PM   #23
Perry Babin is offline Perry Babin  United States
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The high side is floating. That's why you can't see a good signal. Measure it with a meter, gate to source and compare to the two banks with good signals.

What sort of scope do you have?
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Old 18th February 2019, 01:15 PM   #24
chrisg4 is offline chrisg4  South Africa
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on the good sides i get 6v and the other banks 0.06v

beckman industrial analog 9020
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Old 18th February 2019, 01:27 PM   #25
Perry Babin is offline Perry Babin  United States
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Black probe on pad 3 and red probe on pad 1?

I didn't know if you had a battery operated scope.
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Old 19th February 2019, 05:33 AM   #26
chrisg4 is offline chrisg4  South Africa
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get below wave forms

Click the image to open in full size.

Click the image to open in full size.
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Old 19th February 2019, 06:15 AM   #27
Perry Babin is offline Perry Babin  United States
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Were you driving a signal into the amp when the photos were taken.

Are you still only getting a signal on the low-side FETs?

What is the DC voltage across pins:

1 and 19 (black)

10 and 12 (black)
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Old 19th February 2019, 06:24 AM   #28
chrisg4 is offline chrisg4  South Africa
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yes i drove a 100hz sine wave

those waves appear on both high and low side

1 and 19 : from 2.1v fluctuates to 9.8v and then drops back to 2.1v

10 and 12 : same as above
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Old 19th February 2019, 06:37 AM   #29
Perry Babin is offline Perry Babin  United States
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How did you finally get to see the high side?
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Old 19th February 2019, 07:18 AM   #30
chrisg4 is offline chrisg4  South Africa
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using the scope ground on source legs gave the above wave forms
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