Question about HP Projection Televisions

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Sony model 51-ws510, Picture is drawn in from top to bottom in the middle of the screen (keystone) all images are on the screen but distorted. I think it might be the high voltage block assy, but before ordering it I need a pro's view on the problem. The sound is ok. Thanks, gary johnson

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  • garydj10 Dec 08, 2008

    Here is an image of the screen, hope this helps diagonse the problem.


  • garydj10 Dec 10, 2008

    Tbanks, the serial number is 8733955. Should I order the service manual for the set before replacing the ic's? I have looked at the boards from the back but couldn't identify the ic's visually. As I look at the set from the back I see 3 boards, the vertical one where the power comes in, and two large boards laying flat. I do appreciate the assistance. Thanks again, Gary


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No this is a convergence issue. Try auto convergence if this doesnt work. Try manual convergence. If that doesnt work then its your IC chips.

Posted on Feb 27, 2012

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It doesn't look high voltage block problem.
Can you post here snap of TV showing problem ?

Posted on Dec 05, 2008

  • Shahid Electronics
    Shahid Electronics Dec 09, 2008

    Thanks for posting picture and it really helped to understand the tv problem.
    It is failure of convergence out ICs and if you have little experience of Tv repair and solder work, you can replace these ICs.

    8-749-019-08 IC STK392-560 Quantity 02

    Available in Part Store and price is approx $33.42 each

    And if you don't wish to do it yourself, you can replace complete board.

    A-1302-708-A D BOARD, COMPLETE

    available in Part Store and price is approx $288.42

    !! IMPORTANT !! Before order D Board, let me know serial number of tv to check exact D Board part number.

  • Shahid Electronics
    Shahid Electronics Dec 10, 2008

    I think it would be nice if you get related service manual from any online part store.
    service manual would help you to find part location, board location ect.


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Picture curveing down in the middle from the top and curveing up in the middle from the bottom. It also has double and triple colors/images.

your covergence curcitshave failed . there is a high chance that the stk- chips will need to be replaced. at our shop such a repair averages about 150. there may also be some micro fuses that will blow when these chips blow

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Convergence ICs have failed. The Sony type 1 convergence repair kit available from is the correct kit for your model. The kit contains the parts and the CD with instructions.

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Convergence, picture is warped on the sides, double images or ghosts, clear in middle

Projection TV sets have several common problems listed below.

Problem #1) Convergence


  • Screen Looks 3-D
  • Colors wont align
  • Screen may look distorted
  • No Audio/Video - makes a chirping sound.
Example Photo:
Problem #2 CRT Fluid has clouded over.


  • Dull Video, Washed out
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You can see more examples and find a fix here...


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This is a common problem. Its called a convergence failure.

Problem #1) Convergence


  • Screen Looks 3D
  • Colors wont align
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You can see some examples and find a fix here...

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That symptoms are due to failure of convergence out ICs in your TV that will be replaced to get correct converge picture on front screen.

There are 2 big black IC mounted on big aluminum heat sink and number would be written on as STKxxx, these 2 ICs will be replaced.

If you want to repair TV by yourself then confirm model number of TV to provide you more info or call local tech to replace said ICs.

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Text/images overlap each other in 3 colors, 3D distorted picture

Here are some of the most common symptoms and example photos of a convergence problem

  • Screen looks 3D
  • Colors don't line up
  • One or more colors can't be adjusted when using the convergence menu.
  • Screen is bowed or warped.

Here is a quick test....

Using your original remote go-to the tv settings then goto the convergence section.

Try to adjust the red and then the blue convergence.

You should be able to move them up, down, left, and right.

If you can't move them in all directions your convergence chips are bad and should be replaced. This is a common problem.


You need to replace the convergence chips and convergence resistors. Check the site They have put together a kits for most models. If you don't see a kit for your set send them a quick email and they will put one together for you. Their kits includes photo instruction guides, original Sanyo STK chips, convergence resistors, pico fuses, etc.

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Image Distorted

This is a classic convergence problem. Please confirm that your model is 51H84 and whether or not you intend to repair this yourself. You will need to know how to solder. If you wish to attempt the repair, confirm the model and update this and I'll provide you with details and instructions.


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Sounds like some kinda convergence problem. Can you post an image please?

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Did you also replace the bias resistors required when you converted from STK392-110 to the higher STK392-xxx modules? If I wer you I would go back to the orginal modules only new ones. Then I would also get a schematic to test the voltage levels on the chips to make sure they are the same as on the schematic.

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