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Samsung TXJ2754 bottom half of vertical missing

Discussion in 'Electronic Repair' started by carneyke, Sep 21, 2006.

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  1. carneyke

    carneyke Guest

    This set has some (1/2 inch) retrace lines at the top of the CRT. From
    the center down there is no vertical deflection. I've changed some
    capacitors in the vertical along with the vertical output IC (LA7845)
    and have the same problem. All low value resistors in Vertical look
    good, no obvious signs. Ther are several zener diode that look ok in
    circuit along with other diodes / transistors. Does anyone have any
    information on this set ? I've Googled and found no vertical problems
    with this model. Take Care !
  2. James Sweet

    James Sweet Guest

    Grab a datasheet for the vertical out IC, check and make sure both
    positive and negative supply rails are present if used, aside from that
    check any remaining capacitors and solder joints.
  3. carneyke

    carneyke Guest

    I think it may be an EPROM problem as searching the WEB pointed to
    EPROM problems with this set (although the problems weren't vertical).
    I called the owner of the set for the remote (needed to adjust Vertical
    heighth / linearity). I'll write the numbers down then adjust them.
    I'll also take your advice on the datasheet. Thanks.
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