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TV keeps blowing audio IC

Discussion in 'Electronic Repair' started by Chris F., Jun 10, 2005.

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  1. Chris F.

    Chris F. Guest

    Thought I had this little 9" TV working, but another even tougher problem
    has popped up. After I originally fixed the set, I ran it for several hours
    without any problems. Unplugged it and closed up for the night. When I
    plugged it in and turned it on the next day, the volume was stuck on full
    blast. I replaced the an IC which serves as the audio OP, volume control,
    and mute; I also checked for bad caps and cold solder, and measured the
    voltages on the IC to make sure they were correct. Set works great for a few
    more hours, again I unplug it and close up. Once again, the next time I
    power it, the sound is full blast. I only have one more IC left, and I'm not
    installing it until I know what the underlying problem is!
    A note about this set; when switched to radio, it uses the same audio IC.
    The IC is powered by a separate power supply, not from the TV flyback.
    What am I missing??
    BTW please see my previous post "Yoke Replacment" for info about the
    previous repair.
     
  2. Doug

    Doug Guest

    maybe static charge of crt to speaker or chassis.
    Check crt grounding if ok and speaker is close to crt run a ground to
    the speaker frame useing a resistor maybe 1 k.
     
  3. James Sweet

    James Sweet Guest

    Did you check the voltage of the power supply at the IC?
     
  4. Chris F.

    Chris F. Guest

    Yup, 12V dead on just as the specs dictate.
     
  5. Chris F.

    Chris F. Guest

    That's what I'm wondering too, since it only seems to fail on powerup. I
    will check that out.
     
  6. James Sweet

    James Sweet Guest

    Did you check the voltage at powerup too to make sure it doesn't spike?
    Unlikely but possible.
     
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