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Toshiba Model # CF2765K Chassis #: 9010 Vertical Problem

Discussion in 'Electronic Repair' started by Robert McPherson, Sep 24, 2003.

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  1. Set originally had bad linearity at top & side bowing (pincusion)
    problems.
    I have fixed both of those problems, but still have about 1" of black
    space at bottom of raster. There is no available Howard Sams
    Photofact on this model or chassis that was produced. I have changed
    all of the usual capacitors, and replaced the AN5521 vertical IC. All
    of the waveforms going into and out of the IC appear normal. All of
    the DC voltages on the 7 pins of the IC are normal, EXCEPT possibly
    for pin 2 (Vertical output) The DC voltage is almost 8 volts, but the
    DC voltage called for on a similar? Toshiba TV (Model # CF2665K)for
    which I do have a Photofact calls for 15 volts on Pin 2. The diagram
    I have seems to be very closely related, but it does not show a
    pincusion board which my set has. I am wondering if the DC voltage on
    pin2 of my customers TV should also be 15 volts, and if so, why is it
    lower About 8 volts) than normal. I can not tell from my diagram
    where the DC voltage on pin 2 should be coming from. Any ideas?
    Anyone have a scanned section of the exact schematic which you are
    willing to Email me as an attachment? Thanks for your help. Robert
    McPherson.
     
  2. john

    john Guest

    You missed one cap....Near the jungle IC.
    kip
     
  3. john

    john Guest

    Check that diode close to the heat sink for leakage.

    kip
     
  4. Make sure you changed these caps....

    C301 And C305 Both 1 Uf @ 50v 105 Degree C. and C308 220uf 35v

    If problem still exists , check the fusible resistor value that feeds B+ to
    the IC...if it increases it will cause the circuit to choke.


    --
    ==========================
    Jeff Stielau
    Shoreline Electronics Repair
    344 East Main Street
    Clinton,CT 06413
    860-399-1861
    860-664-3535 (fax)

    ==========================
    "If you push something hard enough it will fall over."
    Fudd's First Law of Opposition - Sir Sidney Fudd
     
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