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Magnavox Ch # 27z101-00aa

Discussion in 'Electronic Repair' started by Charlie East, Jun 24, 2004.

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  1. Charlie East

    Charlie East Guest

    Cust stated no audio and only a line across the screen.. Found R445 burned,
    so the vert chip is probably fried to.Dont have a schematic, Could the
    sound chip(la4270) be using the same B+ as the vert chip? Anyone have the
    value for R445?
    Charlie
     
  2. Ol' Duffer

    Ol' Duffer Guest

    Overheating vertical IC is usually caused by failure of bootstrap
    capacitor. Look for 100uF 35V near vertical IC. Resistor is
    1 Ohm, functions mainly as a fuse. Haven't looked at the
    schematic, but sound usually has its own supply.
     
  3. David

    David Guest

    R445 and R420 supply the + and - voltage to the vertical ic. 1 ohm
    1/3 watt metal film flameproof. The diodes are also known to go
    leaky, plus make sure the connections to the vertical ic are clean and
    soldered well to the board. If the vertical ic is on the big metal
    strap on the back of the chassis make sure it is not loose, otherwise
    the connections will crack again.

    David
     
  4. Charlie East

    Charlie East Guest

    Fixed, Vert chip, Audio Chip, and the resistors feeding them, plus a couple
    of caps in the vert section, one was a [email protected]
    Thanks guys
    Charlie
     
  5. RonKZ650

    RonKZ650 Guest

    Make sure also the anode lead coming out of the high voltage transformer is not
    bad. I had a similar set a few weeks ago that burned up a vertical output IC
    every day at the customers home, but would play endlessly in the shop. Even
    running a wire hooked to chassis ground near the flyback would not make it arc,
    but finally it did arc, about 2" to my hand. Ouch!
    Ron
     
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