Question about Samsung HCL4715W 47" Rear Projection Television

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Convergence After 5 years of excellent peformance, the convergence problem began to show up, first as an intermitent loss of convergence over a period of about six months. Finally, yesterday the blue and green curved into a horizontal arc (pin cushion?)ie top and bottom half curved in towards the center of the screen. Blue convergence adjustment now has no effect. Red seems ok as it is still linear and still adjustable. Video and sound is OK. Need advice on possible areas of concern particularly on a most likely chip that governs the green and blue crt convergence controls. The symptoms of intermitent failure to total failure of the convergence adjustment seems to indicate a possible gradual degradation of a certain chip rather than an intermitent connection or a bad solder joint. Any advice from anyone with a similar experience?

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  • Fredlee Aug 28, 2007

    Replace both IC's STK392-040 made absolutely no difference to convergence problem ie the blue is offset to the right (unable to adjust) and the green curved towrads the center of the screen (pin cushion). SOmething else the STKs like that drives it?

  • Fredlee Aug 28, 2007

    Resistances on board associated with the STKs looks OK and checked OK by comparison in-circuit ohms check. Resistances were checked while the STKs were off the circuit board.

  • Leluron Nov 29, 2007

    I believe I have a convergence problem too. No pictures occur. shadowy lines (red, green and blue) bow towards the center of the screen.

    Please HELP.

    Samsung HCL4715W 47 in. Rear Projection Television.

  • mmont0 Jun 04, 2008

    I have the same convergence problem where the red seems ok and the blue and green bow down towards the center. Will replacing the entire board solve the problem?

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Replace both convergence IC's part# STK392-040. Also check for burnt/discolored resistors nearby.

Posted on Aug 24, 2007

  • David Makowski
    David Makowski Aug 28, 2007

    If the convergence IC's heatsink is cold to the touch,you need to check the two 5A micro fuses which supply the +30 and -30 volts to the convergence IC's (they are soldered in small fuses hard to find but look for them right under the heatsinks of the STK's) When the IC's shorted out they opened the fuses protecting the resistors.

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