Question about JVC AV-36150 36" TV

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I have a JVC av36150 36" when you first turn TV on..there is no sound.. You have to tap the front of it..or go around back and tap the audio input board. what could be the problem..TV works fine once its warmed up and been on for a little bit..Picture is crisp and clear

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  • mwracing Dec 14, 2009

    ok..that sounds good.. I got to thinking..and I dont know that I explained it correctly..there are time when I have the TV on and turn the volume up...and it stays the same..You can turn it up all the way to as high as it will go..and volume dont change..both speakers work fine..you can hear sound coming from both..is there a AMP or something that might cause the volume to sometimes go up and down..and other times not..could the solder joints cause that as well

  • mwracing Dec 15, 2009

    Thanks.. will try to work on it this weekend and see what happens..will post my results when i know more..

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Hi
You seem to have bad solder joints.
If you are handy with a soldering iron you can take off the back cover and knock around the circuit(using something non conductive , i.e a wooden salad spoon) to locate the area of the problem.
Start by following the speakers wires to the connector(s) on the circuit board and the audio output i.c should be near by and mounted on a heathsink, thats the general area where you might find bad solders, you may have to do a bunch of them before you get to it as they are not allways apparent.
Hope this will help good luck

Posted on Dec 13, 2009

  • Jacques Marin
    Jacques Marin Dec 14, 2009

    Hi again


    To answer your question ; yes and it does sounds like the problem is around the audio output i.c.


    The volume is controlled by varying the voltage at one of the terminal of the audio out, so a bad connection would cause that voltage to vary.

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