Plugged wrong power supply into tuner, started smoking. Continues to work fine. Should I still use it? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 3 Old 10-20-2013, 10:33 AM - Thread Starter
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So today I was attempting to re-organize behind my entertainment center because, ironically, I thought the jungle of wires and peripherals back there was looking like a bit of a fire hazard. I had straightened everything out and was plugging the peripherals back in. When I connected the Hauppauge cable card tuner (which uses 5V@2A) I accidentally connected my cable company's switch-digital AC adapter, which runs over twice the voltage. The tuner almost immediately started smoking and crackling and I immediately pulled the plug. It was powered this way for maybe 2-3 seconds. As I sat there breathing in the smell of burned electronics I assumed it was toast. After letting it sit for about 5 minutes I plugged it in, and it is functioning completely fine.

My question is, am I stupid to continue to use this? It appears to be working fine, but obviously this has to be powered on at all times in order to function correctly, and I would hate to have the house burn down because it overheated trying to record a TV show. At the same time, it's going to sting shelling out over $115 for something that may work perfectly fine. I tested it for about an hour running both tuners at the same time, and it was warm to the touch, but I'm assuming no warmer than it's ever been in the past. What do you guys think?
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post #2 of 3 Old 10-21-2013, 09:46 AM
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Crack it open and look for charred parts? I would...

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post #3 of 3 Old 10-21-2013, 10:03 PM
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The tuner chips in these things like this usually run on 3.3V. So there is either a linear regulator or a switching down converter in the box. A switching converter shouldn't have a problem with a higher voltage within reason. So I am guessing the box has a linear regulator. A linear regulatory typically can handle a higher voltage within reason as long as the problem of removing the extra heat has been addressed. Sounds to me like you removed power before the regulator was damaged. If you open up the box, my guess is you seel be a scorch mark on the board, or maybe scorched paint on a part.

IMHO you should be fine continuing to use the box. If it fails, it should be no worse than a normal part failure.
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