I have a mitsubishi vs-4503 tv with three different tubes in the back of the tv that projects the picture onto the screen. The green coloration problem exists because I am not able to overlap the red, blue, and green lines via the TV alignment option in the menu screen. The directions state that you should overlap the green, blue, and red lines to have a crosshair that is white. I can only move the blue and red lines while the green line stays stationary. It will allow me to move the red and blue lines but not far enough to where they can all overlap. For instance the horizontal line allows the red and green lines to overlap but not the blue line. While the vertical allows the blue and green line to overlap but not the red. Is there any way to move the green line so that I am able to overlap all the lines. Any help would be greatly appreciated!!

Brad, July 2006

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Shayne, August 2006

R7F1 open circuit has also been listed as a known problem of poor convergence.

Cobweb, July 2006

The green is the reference gun to which the others are aligned. In the factory the green will have been precisely set to the centre of the screen with a crosshatch template. Unless the green gun has been physically disturbed or it's centering magnets adjusted, then assume it's correctly aligned and the fault is not with the mechanical alignment of the green gun.

Should you adjust the green without a reference template, you will have extreme difficulty in realigning the other colours to it. Even if you got the static convergence aligned, the dynamic (edge) convergence will be totally messed up, especially, if there is an (uncorrected) underlying fault on the circuit board prior to adjustment. Well..then you'd really be in a mess.

If it's an old rear projection set, then often the electrolytic smoothing capacitors on the d.c. supplies to the convergence board will be favorites to be faulty. They can dry out, leak and go low in capacitance. Sometimes the really bad ones can be spotted visibly, by brown, fishy smelling deposits at the base of the capacitors. In my experience Mitsubishi are particulary prone to leaky electrolytics, (although I still do like their products.)

Another problem for the end user is that the basic alignment controls available to the user are very limited. An engineer with the correct service access codes or (service remote control), will have far more convergence adjustments at his disposal.
So probably best left to an engineer experienced to this type of product, as full alignment can be tricky even for an engineer.

It will probably turn out to be those leaky electrolytic capacitors.

Cobweb, July 2006