Question about Hitachi 46UX24B/25K 46" Rear Projection Television

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Convergence circut I have a 46" hitachi rear projection screen tv. I know that it is the conergence that is out but I need schematics or part number to figure which one it is before I start taking it apart ant thoughts?

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STK4274 IS the correct part number. 3 18 pin chips mounted to the right (looking in from the back) on heat sinks. Cross reference is NTE7187 available from www.mouser.com

Posted on Feb 20, 2010

  • raptorperf Feb 20, 2010

    sorry, 3 ea, 15 pin not 18

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Usually there are 2 convergence IC's, labeled STK392-110. Each IC has 3 channes. Each color needs to be corrected 2 ways, vertically and horizontally, so 6 channels are needed. usually one IC does red, red and haf of green while the other IC does the other half of green, blue and blue. If the red colors are off, change the IC closest to the red jack. If the blue is off, change the IC closest to the blue jack. If the green is out, you have a 50/50 shot at replacing the correct IC. It is recommended to use the STK392-150 when replacing the IC's so it might not be a bad idea to go ahead and replace both with the newer numbers.

Posted on Jun 26, 2007

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1 Answer

Hitachi 46f500 46 in problem double picture end two collor


This is symptom of convergence output chips failure in rear projection tv, replacement of convergence output chips will fix the problem.
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