Question about Sony KP-51HW40 51" Rear Projection Television

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Image completely distorted

I have had a KP-51HW40 TV for about 5 years. Couple weeks ago, the image shown on the screen suddenly becomes out of shape. All three colors are out of alignment and the image is bended like a picture been squeeze from top to bottom in the middle. According to some articles on the net, it is possible due to the broken convergence ICs (STK392-560) which I replaced. However, the problem is still there. It would be greatly appreciated if you could offer some help.

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  • haoye shen Jul 29, 2007

    Thanks Techman. My email address is haoyeshen@nokia.com

  • haoye shen Jul 30, 2007

    Very sorry Techman. The correct eamil is haoye.shen@nokia.com

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In that set there is a fuse for each of the 6 channels in the convergence circuits and there are also 2 fuses on the power supply board which feed the * and - supplies to the convergence IC's. If one of the fuses opens on the power supply board then the new convergence IC's will not work and your colors will not line up and the edges will bow in. The fuses are labeled on the board with "F---" and look like small yellow resistors. If you properly replaced both convergence IC's, examine all 8 fuses and replace the open ones and your convergence will return to normal.

Posted on Jul 30, 2007

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You will need the service manual to locate the blown resistors and or the circuit protectors in this TV set. If you know how to read the service manual, the schematic, and trace the circuit, know how to use and ohm meter and a volt meter, I am sure we can fix this set together. Let me know with an e-mail address so I can save you 30 bucks for the service manual. Good Luck

Posted on Jul 29, 2007

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  • Larry  Dillon
    Larry Dillon Jul 29, 2007

    Oh , also make sure you double check, no triple check your soldering work on the IC's you replaced, as I have seen many times small solder bridges across the connections cause many problems too.

  • Larry  Dillon
    Larry Dillon Jul 30, 2007

    Manuals on its way. Good Luck

  • Larry  Dillon
    Larry Dillon Jul 30, 2007

    Are you sure of the e-mail address, as the mail came back as undeliverable

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1 Answer

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Yes, this problem can be fixed if you are handy with electronics stuff repair and can solder parts in circuit board easily with proper tools.
Replace convergence out ICs to get converge picture.
Let me know exact model number and brand of your TV for further info as question shows its Sony KP-51HW40 tv.

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