Question about Legacy LA838 Car Audio Amplifier

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Smoking amp will my amp still work if it smoked when i hooked up the battery why did it do that???? The battery was pretty dead so could it be from not having enough power in the battery or what is the problem or do i have 2 buy a whole new amp???

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Letting the smoke out of your amps is clearly not good. If you got the polarity wrong and there was no reverse current protection, it could smoke. You must consider that there was some kind of short or serious component failure involved because circuit breaker and fuse design usually prevents this. I can only speculate that if you plug it in the same way you did before, it may need some nicotine gum. Just do it outside on cement or asphalt (fire hazard) not installed in your car.

Posted on Jun 16, 2009

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The only way you'll know is by hooking it up and testing it. Amps should not smoke, so there's a pretty good chance you fried it.

Posted on Jun 16, 2009

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2 Answers

Smoking


Gee I would think that it is kind of obvious; your amp is blown. Just because it doesn't blow fuses doesn't mean much. If you hook the power up to the ground input and the ground to the power and then turn it on you pretty much toasted the amplifier. If you don't know why the amp is smoking, but you're trying to fix it yourself, you are basically telling me that you have no business doing so. I have been an installer for 15 years and even I am not dumb enough to try to fix a bad amplifier. Do everyone a REALLY big favor; stop messing around with something that you don't understand of have knowledge about before you hurt yourself.

Mar 16, 2008 | Legacy LA838 Car Audio Amplifier

2 Answers

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Sounds like you may have a shorted switching Transistor in the switch mode power supply causing a short to ground. If you are technical enough. Remove power remove cover and do a continuity test on the transistors on the heatsink. non of them should read zero resistance between the three legs. in all connection configuration you use to hook up your meter. If one or Two or even all of them do you must replace with proper part.

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