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BEKO TV ( chassis 12.7 ) HELP

Discussion in 'Electronic Repair' started by b, Feb 27, 2007.

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  1. b

    b Guest

    Have this set: 21t44txm, with Beko 12.7 chassis.
    Replaced line transformer as it was smoking. Set now works, but the
    remaining problem now is that the picture (raster) is shifted down
    about quarter of an inch or more.Annoyingly just enough to be

    Have tried entering service mode (menu + 9301) but the adjustments
    thre are for things like IF and tuner type and hotel mode rather than
    picture adjustments. Is there a separate menu I need? There are no
    pots on the main pcb, so there must be a menu somewhere.....
  2. Franc Zabkar

    Franc Zabkar Guest

    The circuit diagram for the 12.7 chassis is available here:

    A DC bias voltage appears to be injected into the vertical yoke via
    R503. It originates from pin 10 of the FBT. Maybe the replacement FBT
    is slightly different in construction, or maybe C564 is dry? Or maybe
    you could play with the value of R503? I'd check all the caps around
    the vertical IC before changing anything, though.

    - Franc Zabkar
  3. b

    b Guest

    Thanks Franc. Will check that out. Also suspect r506 , 150k off pin 4
    of the vertical chip, seems to be repsonsible for similar symptoms on
    other models.
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