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Old 27th November 2017, 04:38 PM   #1
megael9 is offline megael9
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This amp came to me with 4 shortened output mosfets, and a damaged driver board.
I replaced the 4 mosfets and driver board with brand new board. I also
pulled out all the rectifiers to power the amp On, and it powered without any problems, how ever, when I test the signals at the gate of the output mosfets nothing shows. Do I need to have the rectifiers solder back In to get a signal at the output gates?
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Last edited by megael9; 27th November 2017 at 05:59 PM.
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Old 27th November 2017, 08:15 PM   #2
Bertje is offline Bertje  Netherlands
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Only 4 mosfets replaced? I replace each group, when they are in parallel. And use MOSFETS from the same factory badge.
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Old 27th November 2017, 09:41 PM   #3
Perry Babin is offline Perry Babin  United States
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Do you see the test signal at the input to the driver board?

If so, have you connected a 10k resistor from pin 1 to pin 2 of the TL072 to see if the TL072 produces clean audio?
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Old 27th November 2017, 10:52 PM   #4
megael9 is offline megael9
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No, no signa present at driver board input.
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Old 27th November 2017, 11:08 PM   #5
Perry Babin is offline Perry Babin  United States
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You'll have to find the reason that you don't have audio reaching the driver board.
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Old 28th November 2017, 01:36 AM   #6
megael9 is offline megael9
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No reason why I had no signal was because R167 had one leg lifted of the board. Now I have signal at the driver board input pin, but no signal coming out of the driver board output pins.
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Old 28th November 2017, 02:09 AM   #7
seankane is offline seankane  United States
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Maybe something on the new driver board is defective?
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Old 28th November 2017, 02:31 AM   #8
megael9 is offline megael9
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Quote:
Originally Posted by megael9 View Post
The reason why I had no signal was because R167 had one leg lifted of the board. Now I have signal at the driver board input pin, but no signal coming out of the driver board output pins.
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Old 28th November 2017, 03:20 AM   #9
megael9 is offline megael9
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I replaced the driver board with a good tested board, and no charges.
Signal goes in, but don't come out.
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Old 28th November 2017, 03:27 AM   #10
seankane is offline seankane  United States
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Could there be a damaged via on the main board where the driver board solders on?
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