Question about Projection Televisions

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Same convergence problem

Hi,

I saw your post here:
http://www.fixya.com/support/t504398-double_vision

I believe I have the exact same problem. I have a Sony KP 51HW40 and it won't converge using the automated "flash focus". I have a "3D" image, that is, I see red, green and blue misaligned.

The one confusing factor for me is that it happens intermittently, and physically bumping the TV seems to cause it and fix it! In the past, I've been able to fix the problem with a gentle slap to the TV. This time, no amount of bumping fixes it.

If you are convinced it's the convergence IC, I would really appreciate the model number and instructions.

Thanks in advance!
John

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  • 4 more comments 
  • winniewils Aug 02, 2008

    Help!



    I have the same model TV, Sony KP 51HW40 with the same image problem "3D" image (red, green and blue misaligned), BUT my screen is also CONCAVE/BOW on the left & right side and the only clear view with no distortions is a small area in the center of the screen.



    Do I need to replace my D board? If so, please tell me how to access and retrieve the board from the television, so I could send it in for repair. I don't know anything about soldering or the like, so your assistance would be appreciated. Thanks!



    winniewils@yahoo.com

  • jgvergo Aug 10, 2008

    Well, I replace the ICs but I am still having problems. The "3D" r/g/b misalignment is still there. However, now it is aligned in the center of the screen and misaligned at the edges! When I do a Flash Focus, it takes very little time. The center "plus" sign looks perfectly aligned.



    The new symptom, which showed up after I installed the ICs, is that the image is curved.



    BTW, I could not find any 3.5 Pico Amp fuses on my board.



    Here are pictures of my current problem:






    Thanks in advance!!!

    John

  • jgvergo Aug 11, 2008

    The good news: I found two bad fuses and replaced them. The bad news, my picture now looks like this:




    Also, my TV now turns itself off after a minute or two.



    -John

  • jgvergo Aug 11, 2008

    I tested the resistance on each of the 4.7 ohm resistors. There are 6 groups of 5. Each group appears to be in parallel and each resistor measured 1.5-1.6 Ohms. When I did the calculation for 5 4.7 Ohm resistors in parallel, I got 0.9 Ohms.



    So, I de-soldered one lead of each resistor and measured them individually. They measure 5.5 Ohms (I assume this is due to some resistance in y multimeter leads, etc.)



    HOWEVER, I rechecked the fuses, and one of the new ones os blown! What could cause that?



    -John

  • jgvergo Aug 11, 2008

    It is PS8004.

  • jgvergo Aug 11, 2008

    R8100 and R8101 checked out fine. There was no continuity etweem pins 9, 10 and 11 on 8002. As a precaution, I checked for solder bridging on all neighboring pins of the convergence ICs and the checked out fine. I think it's time to call in a professional... :(

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John. I would try to resolder th ics first. Although it may be just as easy to replace them as you have to remove the D board to do either. Your model uses two STK392-560 ICs you will also need about four of the 3.5 amp Pico fuses as Sonys will usuallt take out 1 or 2 of the pico fuses when the ICs go. You can get replacement ICs and picos at the following link and they include free instalation instructions and free on line tech support in case you require more assistance. heres the link.
http://servicemanuals.vstore.ca/

Posted on Aug 02, 2008

  • 2 more comments 
  • Sonny Berry
    Sonny Berry Aug 10, 2008

    Its definately the 3.5 amp picos which need to still be replaced. There are six of them in line with the resistors they are located under the fins of the convergence Ics heat sink. They are solid yellow without any color bands. If you unsolder one end of the picos then lift that side out of circuit to test. Dont operate the set with the picos open for very long or you will destroy the new Ics. Heres what picos look like except yours are yellow instead of green

  • Sonny Berry
    Sonny Berry Aug 11, 2008

    If the picos you found were in line with the 4.7 ohm 1/2 watt resistors and your picture is still messed up, chances are one of the 4.7 ohm 1/2 watt resistors are open

  • Sonny Berry
    Sonny Berry Aug 11, 2008

    Which one of the new fuses was blown, can you tell me the fuse number?

  • Sonny Berry
    Sonny Berry Aug 11, 2008

    Fuse PS8004 is off pin 11 of IC8002, so check Resistor R8100 and R8101 those are the huge 120 ohm 3watt resistors. If those are okay check the solder on pins 9, 10 and 11 of IC 8002 for solder bridging

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