Question about Samsung HCL4715W 47" Rear Projection Television

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Convergence problem 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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Re: Convergence problem

The convergence board is bad in this set. Samsung no longer has this board in stock. You will have to take the board out and rebuild it by replacing both of the STK convergence amp IC's These IC's are soldered to the printed circuit board. They will be standing up against a metal plate, called a heat sink. They are black in color and are about 2" by 3" . They have white lettering on them that start with STK and the some numbers. You get those numbers and go to, enter the exact number of the IC and order two of them. Before you install the new IC's you will need to apply some heat sink compound onm the back of the new IC's. This heat sink compound is avaialable thruogh radio shack. Good Luck

Posted on Aug 23, 2007

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