Question about JVC KW-AVX800 CD Player

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No sound comes out of the left pre outs

I connect the unit to my amplifiers (1 monoblock + 1 Two Ch.), sub sounds great, but the pre outs the left one no sound comes out of it both of them, left front and left rear, the right ones work fine, all of this happened all of a sudden 2 weeks ago....had my unit installed six months ago and was working fine, untill now.

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  • HeadHoncho Mar 13, 2008

    i did swap the red one and the white one, but then the sound comes out from the left speaker, but the right one dont. i checked with the same cable into my home stereo and it works, so what do you think?? is it the HU??, is there any way to repair it any fuse or something??

    thanks a lot

  • HeadHoncho Mar 16, 2008

    Thankyou bery mucho, you were right there was a lot of dirt behind my HU, thanks a lot again.

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It sounds like the preamp wire that carries the left channel signal between the HU and the 2ch amp has an issue. Here's two quick things to check.

  1. Check that both ends of the left preamp cable between the deck and 2ch amp is not loose or disconnected.
  2. Swap the left and right preamp connections at the amp. If the issue stays with the left channel, the issue is with the amp. If the issue moves to the right channel, the issue is with the preamp cable or the HU's preamp output.
Let me know what you find out!

Posted on Mar 13, 2008

  • Tygh Duval
    Tygh Duval Mar 13, 2008

    Definitely sounds like the issue is on the HU side of things. There's no fuse to change on the preamp outputs. The best you can hope for is that the left preamp output on the HU is dirty, loose, or has a broken solder joint inside, where the jack meets the PCB. Clean the jack as best you can, make sure it's not loose, and if you have to, open the HU and touch up the solder joint (which may not be easy to get to) with a soldering iron.

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