Question about Mitsubishi WS-65809 65" Rear Projection Television
Have bent lines, all three color not aligned, 3d effect.
Just changed the two STK convergence IC. Is there a convergence amp or convergence generator that needs changing? if so where do I purchase one? I'm told the problem could be a pico fuse and not the ICs.
Is it possible the two new ICs were blown immediately because some other issue was not first resolved such as the pico fuses or resistors?
What do you suggest?
projection television and a convergence control method thereof are
provided. The projection television, which magnifies images displayed
on cathode ray tubes (CRTs) for the colors red, green, and blue using
lenses and projects the magnified images onto a screen, includes a
convergence control apparatus capable of adjusting the convergence
while an input image signal is displayed, the convergence control
apparatus including: an image signal decoder which processes the input
image signal to generate a data signal, horizontal and vertical
synchronous signals, and a start signal indicating the start of either
the horizontal or vertical synchronous signal; a convergence control
unit which normally projects an image signal output from the image
signal decoder onto the screen and performs convergence control using a
predetermined region of the screen displaced from a visible region of
the screen according to a convergence control command; and a main
microcomputer which inputs the convergence control command to the
convergence control unit when the start signal is input from the image
signal decoder, stops the convergence control when a completion signal
is input from the convergence control unit, and performs a control
operation to continuously display the image signal during the
the pro in convergence control circuit only..so better change tat..
Posted on Sep 21, 2008
It's a convergence problem, as mentioned go into Settings in the TV
menu and select Convergence if Auto it will do it when you select this.
If not it will ask you to do "Multi-Point Convergence" which will bring
up a huge grid on your screen. You must use the TV remote and using
your up and down and left and right buttons to place the "curser" on
each grid and adjust the Red and Blue on each point till you get a pure
white "grid point" Think of the picture as split up into say 72
different puzzle pieces and when you adjust each piece it fixes that
one piece of the puzzle or screen. You want all lines to be pure white
and by looking at the grid if you see either blue or red on the side of
the white line, you want to move the right, left, up or down button so
that the blue or red line gets back on track with it's corresponding
white line grid.
It sounds complicated but you will get it after a few seconds of playing around with it. Convergence should be done after the TV has been on for at least 30 minutes and should be done at least once a year (twice would be better at minimum) You see the problem with RPTV is they use three color lenses and as you watch TV, the lenses over time get out of alignemnt and need to be readjusted to get a clear sharp picture.
I adjusted a TV once that had never been converged in ten years and it took me over two hours to get all 72 points back on track, once done you will notice a way sharper picture and the colors won't be off kilter.
It takes time, but once you get it, you'll get it. I converge mine once a month and it takes me about 2-3 minutes to do the whole screen because I keep up to date on my 58" Pioneer RPTV.
Posted on Sep 21, 2008
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