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Old 1st December 2012, 11:22 PM   #21
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Also the one that was beeping at me is where the board sustained some burning on the board maybe just the one transistor is shot? What would you suggest pull that one and see if the amp will power up?
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Old 1st December 2012, 11:33 PM   #22
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Yes. Before applying power, clamp all transistors tightly to the sink and insert either a current limiter or a 15 amp fuse in the B+ line.
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Old 2nd December 2012, 01:42 AM   #23
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heres what i got removed the smw20p10 chip i powered up the amp i didnt have a 15 amp fuse available so i used a 10 amp fuse connected it to the amp and of course better to be safe i remounted the heatsinks back down and i have no blinking power on the led just a bright led with power i felt the chips while under power none of them were hot what would you suggest?
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Old 2nd December 2012, 04:20 AM   #24
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I also went ahead and hooked up the right channel and i had it pushing a 12inch he2 fosgate and it was sounding good so im assuming the one SMW20P10 is shot would you suggest swapping the chip from the other side and see if i could get it to work or would you just order all new replacement SMW20P10'S all 4 of them?
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Old 2nd December 2012, 04:39 AM   #25
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Since you can't get the original transistors, I'd suggest replacing the two P-channel outputs in the blown channel (I'm assuming that this is a 2-channel amp). Try the 9140s that I recommended. If it works with those, I'd suggest using it like that. There's no reason to replace the other transistors.
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Old 2nd December 2012, 07:52 AM   #26
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I always thought the lots had to match up to keep the boards values balanced throughout the whole board but ill try the 2 first like you said what do i have to lose? Will the INFP9410's work then for me?
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Old 2nd December 2012, 07:58 AM   #27
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You wouldnt happen to know what the difference between the INFP9410 and the INFP9410N are would you? Is one suppose to be negative are something?
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Old 2nd December 2012, 08:25 AM   #28
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9140, not 9410

I'd use the non-N version. The N-version of at least one transistor caused problems that were not seen with the non-N version.

You only need matching between the parallel transistors. There is only one transistor that's in parallel with the one that failed. That means that you replace the failed one and the one in parallel with it.
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Old 2nd December 2012, 08:38 AM   #29
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Ok got you Only the INFP9410 NOT The N When your saying in parallel with the blown on your referring to the one right next to it replace as well not the other channel set on the other side of the board correct?
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Old 2nd December 2012, 08:41 AM   #30
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I don't know how this amp is laid out. Are all of the 20P10s on one side and all of the 45N10s on the other side?
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