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Old 10th October 2008, 11:33 PM   #11
hakentt is offline hakentt  United States
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Took it appart today, pulled all of the output transistors IRF640N there is 8 of them, two of them are shorted between all 3 legs, the Q214 and Q210, meaning on those two the DVOM meter shows continuity.

Perry, what do I do next?
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Old 11th October 2008, 12:11 AM   #12
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You need to remove the power supply FETs (all of them) and check for 5v on the gate resistors. If you have ~5v on all of the gate resistors for the power supply FETs, the drive circuit is probably OK. If you don't have ~5v (0v or near 12v), there may be problems with the drive circuit.

When you order parts, order 10 of the IRF640N. You need to order 10 because you're more likely to get matched date codes from distributors with pre-packaged parts (mouser, digikey...).
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Old 11th October 2008, 12:34 AM   #13
hakentt is offline hakentt  United States
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can I power the amp without putting it back in the aluminum case and without tightening the other FETs to the heat sink to test it for 5v there?
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Old 11th October 2008, 12:35 AM   #14
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Yes.
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Old 11th October 2008, 02:24 AM   #15
hakentt is offline hakentt  United States
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I did just that, pulled the power FETs and tested the voltage at resistors, and am getting 7 mV direct current on all of them,
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Old 11th October 2008, 02:30 AM   #16
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Was the black meter lead on the ground terminal of the amp? If not, where was it?
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Old 11th October 2008, 02:41 AM   #17
hakentt is offline hakentt  United States
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My misstake, I had the battery and I connected the charger to battery, that made the amp to go to PROTECT mode, after I charged a battery a bit, I tested it again with battery alone and am getting rock solid 3.7V on all of them. Is that success? And I tested the 47 ohm resistors and they are all still good, reading 47 ohms
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Old 11th October 2008, 02:45 AM   #18
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The driver circuit is probably OK.

If you're going to order the parts online, wait until Monday in case you find that you need something else.
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Old 11th October 2008, 02:52 AM   #19
hakentt is offline hakentt  United States
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So the gamble is to replace all 8 output FETs and all 8 power FETs?
I can go buy this in local electronic shop, they ussualy got more generic items like NTE, I don't care about the quality all I want is to fix this and sell it, am done with these made in china hifonics

so 8 IRF640N and 8 SFP50N06, what would be the most common replacement for these?
Change those resistors too, they are cheap
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Old 11th October 2008, 03:02 AM   #20
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There's virtually NO chance of getting this amp working (reliably or otherwise) with NTE parts in the outputs. Order the correct parts.

Mouser doesn't have the outputs. Order from Digi-key. Order 10 of each of the FETs.

IRF640NPBF-ND
IRFZ44VPBF-ND
47QBK-ND
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