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Prima 27 inch tv.

Discussion in 'Electronic Repair' started by [email protected], Sep 18, 2007.

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  1. Guest

    model number Q 2770 lack of red on the screen, replaced the crt board,
    with one from a working tv, but after finding r 936 open (220 ohms),
    picture is still lacking red, & I ca't find any resistors open, or
    leaky, or shorted diodes, or drive transistor. What could it be?
    Thanks for your time, Robin.
     
  2. AJ

    AJ Guest

    Take a 68k resistor and ground the red cathode, screen should go red with
    retrace. If not you have a bad crt. Then trace the signal back from the red
    output devcie to the video processor is to determine if indeed you are
    getting red video bias and drive from that area. Good schematic and scope
    will assist greatly.
     
  3. Guest

    thanks for the help but the CRT board IS bad, the unit works fine with
    a test one from a working set and the pix tube is fine.
    I can't find what's bad on the crt board, except the 220 ohm risistor.
    Robin.
     
  4. JANA

    JANA Guest

    If the 220 ohm resistor is bad, did you change it yet? Check the driver
    transistors on the board. If it is an IC that does the drive, change that
    also.

    --

    JANA
    _____


    thanks for the help but the CRT board IS bad, the unit works fine with
    a test one from a working set and the pix tube is fine.
    I can't find what's bad on the crt board, except the 220 ohm risistor.
    Robin.
     
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