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Toshiba convergence problem

Discussion in 'Electronic Repair' started by RonV, Dec 2, 2003.

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  1. RonV

    RonV Guest

    I have a 4 year old Toshiba X81 series RPTV that has always had a
    small problem with convergence in the upper right corner of the
    screen. The red horiz lines on the grid curve up while the red vert
    lines curve out, almost as if the upper right corner of the red gun is
    being "pulled out" an inch or two. Is this caused by a problem in the
    deflection yoke. The red gun was recently replaced for another
    reason, but the problem was the same before and after the gun itself
    was replaced. The red is just fine in the other 3 corners, and the
    green and blue don't have the problem at all. Focus is fine in all
    parts of the screen.

    Ron
     
  2. JURB6006

    JURB6006 Guest

    Either it needs one of the output ICs, likely because this is the natural
    stretch, or the DC offset is too much.

    You change the ICs first, they are most common, or you can check them with a
    scope with differential inputs. I think your odds are 70% or better that it is
    the output ICs.

    Do it right, clean the sink completely and put a BEAD of compound right between
    the screw holes, DO NOT spread the compound ! This assures less air pockets.
    These things are stereo power amplifiers turned ALL THE WAY UP ALL THE TIME !,
    they NEED to get rid of heat and thus the installation needs to be done
    correctly.

    JURB
     
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