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Thread: Help, amp trouble

  1. #1
    Variable Bitrate
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    Help, amp trouble

    Ive been running my carputer for a few mths now, and in the past week my sound has been a hit or miss when turning on my car. I have been without sound for a few days and finally had time to dig around to see what was causing it. I first hooked up headphones to my pc, and that is outputting sound fine. I then took the minijack-> RCA cable and hooked up my ipod to my stereo using it, it played great. So, it must be the amp. The amp is getting power, the red LED is on, when i remove the remote start plug it goes off. I used a multimeter and saw that it had power going to it, but it still stays cold to the touch when it is on, and no sound is outputting. I checked the fuse and it looks fine to me. Any ideas what else to look for? I dont play my music too loud, and its only bee installed for 5 or 6 mths.

    Figures, I just got the GPS parts, and audio breaks.

    any help would be appreciated.

    pictures are on my website here if it helps, they are old, but still the same parts/locations for the amp. http://www.mulcahy.org/gallery/carputer

  2. #2
    Variable Bitrate
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    my guess.... something went out on the amp.... just a guess... doesn't look like anything is hooked up wrong, maybe try some different RCA cables.... other than that see if you have warranty on it!!
    New CarPC on the way again I think. I miss my old one!!!

  3. #3
    Constant Bitrate
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    Quote Originally Posted by naevity
    Ive been running my carputer for a few mths now, and in the past week my sound has been a hit or miss when turning on my car. I have been without sound for a few days and finally had time to dig around to see what was causing it. I first hooked up headphones to my pc, and that is outputting sound fine. I then took the minijack-> RCA cable and hooked up my ipod to my stereo using it, it played great. So, it must be the amp. The amp is getting power, the red LED is on, when i remove the remote start plug it goes off. I used a multimeter and saw that it had power going to it, but it still stays cold to the touch when it is on, and no sound is outputting. I checked the fuse and it looks fine to me. Any ideas what else to look for? I dont play my music too loud, and its only bee installed for 5 or 6 mths.

    Figures, I just got the GPS parts, and audio breaks.

    any help would be appreciated.

    pictures are on my website here if it helps, they are old, but still the same parts/locations for the amp. http://www.mulcahy.org/gallery/carputer

    To test the amp... try connecting the output of your ipod directly to the input of your poweramp.... if there still is no audio from the speakers, then I would check the speaker output connections and wiring from the amp. After that, I would suspect there is something wrong with the power amp.

    Pls post and let us know what was wrong, when you troubleshoot the problem!

  4. #4
    FLAC robiewp's Avatar
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    with the remote start relay, the indicator light likely doesn't mean anything other than the relay still works. Check all of the fuses? if it's under warrenty I'd take it somewhere. If not, pop it open. Sometimes there are fuses on board. How many speakers is it powering? how many speakers is it designed to power?
    car computer rev 5: 8" lilliput and usual suspects

  5. #5
    Variable Bitrate
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    Tomorrow I am gonna check the fuses, i did check the wireharness for the speakers, and that seemed fine.

    Thinking back, it sounds like it is a problem with the amp...In the past week, once or twice when the computer was booting up, i heard slight hissing, it was fast sudden...a kind of sssssfft. And today i noticed iwas getting socked when touching my car, so i THINK that my power cable is bare somewhere and is not supplying correct power to the amp, and is charging my car. Tomorrow I am going to disconnect it from the battery, i think i know where the short could be (if that is the problem)

    thank you for the ideas!!! i will post an update when what i fine. Hopefully it is something I can fix, there should be a warrenty, i just bought it in july. So i still have that to fall back on.

    its a 4 channel amp powering 4 speakers (2 of which are componants). its a pretty hefty wattage amp, and i havnt even come close to its threshhold, so i think its a bad wiring issue and hopefully it isnt a bad amp.

  6. #6
    FLAC robiewp's Avatar
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    I was just curious if you were powering 4 speakers off of a 2 channel amp.... that gets 'em every time
    car computer rev 5: 8" lilliput and usual suspects

  7. #7
    Maximum Bitrate fantomas's Avatar
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    Quote Originally Posted by naevity
    Thinking back, it sounds like it is a problem with the amp...In the past week, once or twice when the computer was booting up, i heard slight hissing, it was fast sudden...a kind of sssssfft. And today i noticed iwas getting socked when touching my car, so i THINK that my power cable is bare somewhere and is not supplying correct power to the amp, and is charging my car. Tomorrow I am going to disconnect it from the battery, i think i know where the short could be (if that is the problem)
    It does sound like a problem with the power wire.. even with just the remote and ground wires hooked up, the red light will turn on (usually). If there was a short, a fuse somewhere should have blown. if not, theres probably a bad connection somewhere.
    good luck.

  8. #8
    FLAC robiewp's Avatar
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    Quote Originally Posted by fantomas
    even with just the remote and ground wires hooked up, the red light will turn on (usually). If there was a short, a fuse somewhere should have blown.
    with the remote start relay, the indicator light likely doesn't mean anything other than the relay still works. Check all of the fuses?
    great minds think alike
    car computer rev 5: 8" lilliput and usual suspects

  9. #9
    Variable Bitrate
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    Well, im back up and running. I first just disconnected the power to both my amp and computer (that stopped working as well). After rechecking the wires, and making sure they were not touching on the amp, i went back to try an figure out the opus. I disconnected and reconnected it about 50 times, it would blink once and then stop. I saw some breakings in the wire cables(the red and black covering had worn away), so I taped them up, I also tried shorting the ground to about 2 feet away, and still no dice. Yesterday I went out and bought a new multimeter to test it out, checked it today and everything seemed fine. I plugged it all back in and it works! So, it looks like I had wiring problems. When it gets warmer out im going to go and make sure all the wires are nice and neat and secure so this doesnt happen again.

    thanks for your suggestions and help
    Jon

  10. #10
    FLA gospeed.racer's Avatar
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    Bad power and grounds KILL amps....just dont let it go too far.
    2005 Ford Focus ST

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