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Hitachi TV

Discussion in 'Electronic Repair' started by Frederic B., Nov 16, 2004.

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  1. Frederic B.

    Frederic B. Guest

    Hi Group

    I got a Hitachi tv model 26AX10BC in for repair (Chassis M1CLUX-H) which
    suffers from vertical jitter and foldover at startup

    when warming up the problem becomes less severe but still present...

    I`ve changed so far all the electrolytics around the vertical IC and also
    changed the IC to no avail...

    ESR`ed (word?) most if not all of the caps in the tv and replaced doubtful
    ones, also checked D752 D753 as per other tech`s instructions...

    I am lost!!!
     
  2. Art

    Art Guest

    Have you checked the "quality" of the power supply voltages to the
    deflection circuits and of the sync signals. Obviously it is thermally
    related so a bit of diligence with "Freeze Spray" may help. If the supplies
    are noisy, with evidence of poor filtering, or if the sync - drive signals
    are distorted when cold may affect the symptom. Strange but we have even
    encountered regulators that change a bit during the first few minutes after
    power up.
     
  3. That model & chassis does not even come up on the Hitachi service site.

    Is it an overseas model?

    --
    ==========================
    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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