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Again with the CTC169...

Discussion in 'Electronic Repair' started by Retro Depot, Apr 9, 2006.

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  1. Retro Depot

    Retro Depot Guest

    Hello again folks. Well, all suggestions made on the previous post were
    tried and the end result is I'm back to square one! Just to remind you, this
    36" RCA has what looks like distorted video, both RF and composite inputs
    garner the same results. Image is shifted to the left approx. two inches,
    color is intermittent, there are severe hue shifts intermittently, colors
    sometimes bleed a little, sometimes when channel is changed vertical roll
    momentarily, when bringing up menu in video mode, OSD is perfectly centered,
    go figure. The jungle has been replaced so have countless other
    components...aaaarrrggghhh. Please help.
    Cheers, Steve
     
  2. Dani

    Dani Guest

    If you had a pix of the symptom, it would be a great help. Did the unit
    arc...I mean the CRT? If the ground that plugs into the CRT board, it
    can arc, & kill the jungle IC. Or, you
    may have a bad Q2906 the luminance buffer shorted on the main board
    toward the back of the chassis, (not sure of the location # ), look
    for the three R,G,B video buffer
    transistors in a row near the crt bias and drive controls and then look
    for a single transistor near there that is the luminance buffer. Hope
    this helps, Dani.


    Look here: http://wa6ati.com/Ctc169.htm
     
  3. Retro Depot

    Retro Depot Guest

    Thanks for the info Dani, and yes I do have a screen shot I can send you.
    Video buffer usually has symptoms like bright raster w/retrace, no video.
    The problem I have has got me beat. I'll keep you posted as to what has been
    done later, for now I'll send the pictures.
    Cheers, Steve
     
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