Question about Mitsubishi WS-65869 65" Rear Projection Television

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WS-65903 HD1080 view on screen is wider on the edges than in the middle. edges are slightly out of focus.

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  • ksw1958 Jul 04, 2008

    Even on standard format I have a full screen except in the middle. Kind of a reverse fisheye effect. The effect follows all formats, the middle is has a black curve on top and on bottom that dissapears at the edges.

  • ksw1958 Jul 04, 2008

    That fixes it when you turn it off and then turn it back on,--- uppps spoke to soon --- it just went back. It was ok for about 2 minutes.. Is there any particular manuel or parts list needed to correct this thing. (I dont have any cable box nor anything else, it plugs directly into the coax from the cable company.) (in answer to your first question)

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When horizontal amplitude is too small ,generally the right part of the picture shrinks more than the left part .It is presumed that the horizontal sawtooth wave current passing through the deflection coil is too small in amplitude . In order to change the horizontal amplitude ,you have to change the magnitude of the saw-tooth wave current that passes the deflection coil. The amplitude is adjusted by the variable inductance connected in parallel with part of the winding of the flyback transformer .If this inductance is made smaller the local current passing here will grow larger and as a result the deflection current going to the deflection coil will become so much smaller and the amplitude of the deflection will be reduced.The most logical cause of narrow picture that cannot be corrected by adjustment of the width control is insufficient horizontal drive .If the problem is in the horizontal oscillator circuits it will show up as a low output waveform from the horizontal oscillator.The most likely defects are open emitter capacitor in the horizontal oscillator transformer ,possibly off-value resistors.However,any number of defects could produced a low output.
The first step is to isolate the problem to the horizontal driver or the horizontal oscillator by waveform measurement .If the problem is in the horizontal oscillator keep in mind that the trouble can be in the AFC section.
Find a technician to do works for you , in order to avoid high voltage shock...

Posted on Jul 04, 2008

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I think the settings of the tv had been changed .try to reset it to the older level by adjusting the settings or by using the reset key.thankyou

Posted on Jul 04, 2008

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Press format key on mitsubishi remote control and try to get full screen.let meknow if it works if not do you have a cable or satellite box and what type?

Posted on Jul 04, 2008

  • DOUGLAS HERNANDEZ Jul 04, 2008

    turn tv off and wait 5 minutes and see if picture comes back to normal .This sets are know for having convergence problems giving you the fisheye effect, the solution to that is resoldering the convergence ics 2 of them, or replaced them STK392570

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the language for the menus and on-screen displays.
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