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RCA Color missing

Discussion in 'Electronic Repair' started by Tonto, Sep 17, 2007.

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  1. Tonto

    Tonto Guest

    Hi Group, I am working on a RCA TV #F32645, CTC203CH3 it was a dead
    set, I replaced the flyback, hot, and the vert. output u14501, the set
    came alive, ok, now the color is missing, it is in basicly black &
    white, there is some color, but it is very very very very faint, i
    checked all the resistors, they seem to be fine, when I use the menu
    controls they don't do anything, the screens are in color, but other
    than that, I'm clueless @ this point, any help in this matter will be
    taken seriously, and you will be rewarded with my sincere gratitude,
    Thanx, Stan...
     
  2. JANA

    JANA Guest

    This is in general:
    You will need the service manual, and a scope. Check to see if you have the
    burst oscillator working in the colour demodulator section.

    The most simple check you can do is determine if there is proper voltages to
    the colour demodulator section.

    One thing that may have also happened is that there may be a missing voltage
    from the secondary supply side of the flyback output side. If you look in
    the schematic of most TV sets, the flyback output goes to some high speed
    diods and then to some filter caps. This is to supply secondary power to
    specific sections of the TV set.

    --

    JANA
    _____


    Hi Group, I am working on a RCA TV #F32645, CTC203CH3 it was a dead
    set, I replaced the flyback, hot, and the vert. output u14501, the set
    came alive, ok, now the color is missing, it is in basicly black &
    white, there is some color, but it is very very very very faint, i
    checked all the resistors, they seem to be fine, when I use the menu
    controls they don't do anything, the screens are in color, but other
    than that, I'm clueless @ this point, any help in this matter will be
    taken seriously, and you will be rewarded with my sincere gratitude,
    Thanx, Stan...
     
  3. Art

    Art Guest

    Another possibility is the colour crystal may have become dislodged while
    doing the other servicing or the solder connections in that area may be
    flakey.
     
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