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Old 24th March 2013, 03:53 AM   #21
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I don't think that those are drivers.

Follow the traces on the main board leading up to E1 and E2 on the driver board and confirm that you read 0 ohms between those traces and the terminals on the driver board.
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Old 25th March 2013, 09:22 PM   #22
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I followed the driver board E1 and E2, but missed the connect.
I think have a faultly junction, and connect directly driver board terminals to resistors.
Now, very hot the fets.
Probably came out of the original problem which makes it burned...
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Old 25th March 2013, 09:38 PM   #23
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Click the image to open in full size.

Click the image to open in full size.Click the image to open in full size.
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Old 26th March 2013, 02:08 AM   #24
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At the driver board, for pins E1 and E2, what is the resistance from the top solder pad to the bottom solder pad for both E1 and E2?

From the top side of the board for E1 and E2, what is the resistance to the gate resistors on both sides of the amp?

One of the resistors near the FETs appears to have a cracked solder joint. Check all in the area carefully.
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Old 26th March 2013, 10:02 PM   #25
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1. 0.8 - 0.8 ohms
2. break
I was solder two wire directly from E1 and E2 to gate resistors, but 6 fet heating (E1 circuit)
Fets immediately heating. I think a short circuit.
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Old 26th March 2013, 10:12 PM   #26
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And now, the six fet are burn that my E1 and E2 driving wire not in it.
(sorry for my english)
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Old 26th March 2013, 10:27 PM   #27
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If you read the same resistance from E1 to all of the gate resistors that it drives as you do for E2 and all of the gate resistors that it drives, the problem is likely on the driver board.

I'm assuming that you've confirmed that there are no solder bridges on the FETs.

If you have a current limiter or if the FETs heat up slowly enough, check the drive signal at the gate legs of the FETs to confirm that all FETs have the same drive signal.
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Old 26th March 2013, 11:20 PM   #28
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I thought the six fet's short circuit between gates and drains, because 80ohms the resistance the legs. Another six fet is 0.
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Old 26th March 2013, 11:22 PM   #29
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Excuse me! Not 0! It's break.
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Old 3rd February 2014, 06:42 AM   #30
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Now, I replace this components.
Power supply:
IRF1010E all
driver board transistors and lm293
Amplifier:
IRFP250N all
driver board 1D and 2Ds and all ICs.
Two suppressor diode and 1ohm 2w resistor.
The amp is working and hear the music, but faint low-frequency signal beeps sits and reviews about the speaker crackle quarter volume. The low frequency signal strength does not change.
Is this op-amp problem?
http://www.youtube.com/watch?v=sWmw9deZyx8

Last edited by KriszXJR; 3rd February 2014 at 06:59 AM.
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