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Old 2nd August 2020, 04:50 PM   #41
goviboo is online now goviboo  Trinidad and Tobago
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Arite, I removed the board from the heatsink and powered up without audio.
The amplifier pulled the power supply down again to 7v and the amps went up to 13a.
All PS FETs and output FETs are getting warm. I didn’t keep it powered for long though.
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Old 2nd August 2020, 04:52 PM   #42
Perry Babin is offline Perry Babin  United States
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Post the waveforms at the gate legs of the PS FETs. Only one is needed is all are identical.
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Old 2nd August 2020, 05:01 PM   #43
goviboo is online now goviboo  Trinidad and Tobago
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Waveform across PS fet...
Attached Images
File Type: jpg 675519B4-FBC6-4F7E-BDBB-A9F3A332C1DB.jpg (1,014.0 KB, 13 views)
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Old 2nd August 2020, 05:06 PM   #44
Perry Babin is offline Perry Babin  United States
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Have you checked all of the rectifiers and output FETs?

You may have to pull the rectifiers to determine if the problem is in the audio or in the power supply section.
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Old 2nd August 2020, 05:42 PM   #45
goviboo is online now goviboo  Trinidad and Tobago
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All FETs tested ok, I already tested the rectifiers, but didnít think to power up with them out the circuit, I read somewhere in the manual, class D may not like this.
Anyways I removed the Rectifiers and powered up. Attached is a pic of the gate drive. ( I still have the transistor removed)
I have 40v ac on either side of the board where the two sets of rectifiers were.
Attached Images
File Type: jpg 74054585-8EF8-46D5-867B-4B60BD009C18.jpg (1,023.8 KB, 14 views)
File Type: jpg 71633A63-1A8B-4C07-A7FD-85A3DFBAB968.jpg (1,006.1 KB, 14 views)
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Old 2nd August 2020, 06:07 PM   #46
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
You can't fully troubleshoot with no rail voltage for some class D amps. Unless I'm forgetting something, I can't remember it being harmful in any way.

If the problem is in the audio circuit and no semiconductors are heating up, you may have a defective rail cap.
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Old 2nd August 2020, 08:31 PM   #47
goviboo is online now goviboo  Trinidad and Tobago
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The first waveform is the gate drive on the PS.

The second on the p-FETs,

The third on the n-FETs.

All 18 caps removed and checked, several were just over half their capacity.

Amp returned to heatsink and tested with a 45hz sine wave.

Tested ok, onto ordering parts....

Thanks a mil perry!
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