fried amp channel?

[mxracer591 10+ year member]

ok, seriously don't make fun of me cause this was totally on accident. my power wire came out of my amp that i'm using for my door speakers. it's a small, older alpine 2 channel...i think like 2X50 rms or something. anyway, the power wire accidentally touched one of the speaker channels, and the speakers made a noise, and it sparked, and smoked a bit. now only one channel works. so obviously i fried something, but my question is...what most likely happened? is it fixable with some soldering/new components from radio shack? if it's too hard to fix, it's no big deal cause i really didn't pay anything for the amp, just would like to not have to buy another one.

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[Einzee 10+ year member]

There is a huge possibility that you burnt the output transistors and that would render the amp useless due to its age and the availabiliy of parts.

Personally, I'd open it up and take a look. There is a possible chance that the 12 volts from the power wire fried the circuit board and nothing else. Upon opening the amp and exposing the side of the circuit board that has the fine lines (copper), simply locate the ones that lead to the speaker connections and inspect for burns and open connections in those fine copper lines. If you find one, and I'm sure you will, you will need to scrape the coating (usually green colored) off of both sides of the burn area. The copper that is exposed from your scraping MUST be CLEAN. Use a solid 22/24 AWG wire and solder it across the gap.

Im not sure of the way that particular amp is constructed so I cannot help you with disassembly. I will point out that there will be transistors that are attached to large heatsinks either clipped on or screwed to the heatsink. Also, be careful not to wipe off the "grease" that is on the transistors because it is needed to conduct the heat that is produced by the transistors.

Now if you take your time and pay attention to what you are doing and also possess decent soldering skills, you may just luck out and have an amp that works.

ps. for anyone reading this and saying that im fu(king nuts..... hehehehe youd be amazed about some of the things I have brought back to life.

 

[Millertime1028 10+ year member]

^^ x2 all the way .. Ive done this with 2 amps in the past with good results . Like you said you just have to have a little soldering skill .

 

[mxracer591 10+ year member]

hmm. looks promising, i'll have to take it apart after work and see what i can come up with.