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Old 22nd January 2012, 03:43 AM   #11
timwebb is offline timwebb  United States
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turn the amp on and find the voltage on the solder tabs for both. one should be positive and negative.
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Old 22nd January 2012, 04:29 AM   #12
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Generally, the PNP has the filled outline.
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Old 22nd January 2012, 04:38 AM   #13
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Using battery terminal for reference gnd? Wouldnt i have to have the power sup ply transistors in to check the output side of the board? Thanks for the quick responses guys its greatly appreciated!
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Old 17th February 2012, 04:12 AM   #14
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Altight i replaced all the transistors and powered the amp and it immediately blew one of the large caps.... im lost. It was pulling .14 amps idling with just power on the +- terminals then blew when i switched power on to remote. It was flashing the protect led as soon as i hooked up the + and -... i have no solder bridges and im pretty sure all the transistors are in their correct positions. Any ideas?
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Old 17th February 2012, 04:46 AM   #15
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the caps could possibly be the reason for failure. i would remove them first, and the 2 rectifier diodes, then check over your new fets for shorting, as well as the drivers before powering it up again. you say 1.14a with just power and ground? (replying from page1) that should not be. it should take some power, but just a little at first, and then no longer draw until powered up. if the rail caps were damaged from freezing, then the power supply caps may be damaged as well. or, the power fet driver(s) can be shorted, keeping a couple fets powered constant. either way, find that draw, and you will find a problem keeping you from powering up the power supply.
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Old 17th February 2012, 06:24 AM   #16
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Post a photo of the blown cap on the board.
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