Question about Sony KP-57HW40 57" Rear Projection Television

1 Answer

All 3 lamps are still projecting, but the picture is skewed. The 3 colors are not in sync

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  • 5 more comments 
  • randall1620 Feb 06, 2010

    I am handy enough to do circuit board repairs, soldering, etc. If you could provide more details about the part(s) that need to be replaced, that would be most helpful.

  • randall1620 Feb 06, 2010

    Thanks for recommending the convergence out chips.
    They appear to attached via phillips head screws.
    Do you know if a phillips head screwdriver is all that's needed?
    And are there any electronic recalibrations that have to be performed after I install the new chips?


  • randall1620 Feb 11, 2010

    It appears as though I will need to take the whole circuit board out in order to be able to get to manipulate the chips. The reason why is because the chips are on the opposite side of the heat sinks. Do you agree that I should take the whole circuit board out?
    If so, are there any "gotchas" or precautions I should take?

    Also, what do you recommend using to clean dust off of the 3 projection lenses?


  • randall1620 Feb 12, 2010

    I have removed the circuit board.
    What I have found is each chip is not only solder into the board, but also glued to one of the heat sinks.
    How would you recommend removing the chips?
    Should I unsolder the heat sink and chip at the same time then work on removing the chip from the heat sink?

    Would it be useful to send you a picture of what I am describing?
    If so, is there a way to attached a picture or send it to you somehow?


  • randall1620 Mar 10, 2010

    I replaced the two convergence chips, but the original problem still remains.
    The good news is that I successfully desoldered and removed the old chips, solder the new ones in place and successfully connected all of the cables.
    The reason why I know I was successful at the above is because the picture is the same as before.
    Can you think of another reason why the picture is distorted and out of focus?
    Here are a couple of photos that I took.






  • randall1620 Mar 14, 2010

    I have found PS5001 and PS5002 on the power supply board.
    I am looking for PS8001 to PS8006, but I don't know what the D board is or what it looks like. Can you tell me where to find D board?


  • randall1620 Mar 15, 2010

    Are you recommending that I replace PS5001, PS5002 and PS8001 - PS8006? Or should I look for components that are damaged/burned?

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  • 10,594 Answers

Hi,
If your tv is Sony KP-57HW40 then its problem of convergence out chips failure and will be replaced. If tv is any other model, please mention it.
Let me know if you are handy with electronics stuff repair and can replace parts in circuit board with proper tools to provide you more technical details.
Thanks.

Posted on Feb 06, 2010

  • 5 more comments 
  • Shahid Electronics
    Shahid Electronics Feb 06, 2010

    I am handy enough to do circuit board repairs, soldering, etc. If you
    could provide more details about the part(s) that need to be replaced,
    that would be most helpful.
    =============================================================

    Great, it is solution for Sony KP-57WH40 tv that has skewed picture.
    There are two big black ICs mounted with aluminum heat sink on D Board and number is STK392-560, these are convergence out chips that gone bad and requires replacement.
    STK392-560 are available in Part Store for $38 each and tv needs 2 ICs.




  • Shahid Electronics
    Shahid Electronics Feb 06, 2010

    Thanks for recommending the convergence out chips.
    They appear to attached via phillips head screws.
    Do you know if a phillips head screwdriver is all that's needed?
    And are there any electronic recalibrations that have to be performed after I install the new chips?
    ======================================================================
    There are 2 screws just to mount with aluminum heat sink to keep chips cool but..
    Each chip has 18 pins that are soldered in circuit board, need to unsolder these pins to take out bad chips, put new chips and solder its pins in circuit board.
    Good soldering expertise are required to fix tv problem.



  • Shahid Electronics
    Shahid Electronics Feb 11, 2010

    It appears as though I will need to take the whole circuit board out in
    order to be able to get to manipulate the chips. The reason why is
    because the chips are on the opposite side of the heat sinks. Do you
    agree that I should take the whole circuit board out?
    If so, are there any "gotchas" or precautions I should take?

    Also, what do you recommend using to clean dust off of the 3 projection lenses?
    ==========================================================================

    Yes, if you take out circuit board from chassis, this would be easy to replace chips. Pull connectors that are required in that process and put them back after chips replacement.
    Cleaning of dust is good, use cotton cloth to clean lenses.



  • Shahid Electronics
    Shahid Electronics Feb 12, 2010

    Chip pins are soldered to board, that is correct and need to unsolder pins but chip is not glued to aluminum heat sink, there would be 2 screws on sides of each chip, remove them, chip pins must be unsolder from circuit board, take chip out easily and if you feel its glued, use some thing like flat screw driver at side of chip to pull it from aluminum heat sink surface.
    That white glue is silicon compound that used to transfer heat from chip to heat sink quickly and smoothly.
    You can post JPG picture under 150k file size here by clicking icon right side of you-tube icon on writing comments area on this page.

  • Shahid Electronics
    Shahid Electronics Mar 10, 2010

    OK, it sounds old chips blew off pico fuse in power supply board as well.
    Pico fuse is small resistor look part that has 2 pins either side, check PS8001 to PS8006 on D board and PS5001 and PS5002 on power supply board that provide +/-22 volts to convergence chips.
    Thanks.



  • Shahid Electronics
    Shahid Electronics Mar 14, 2010

    I have found PS5001 and PS5002 on the power supply board.
    I am
    looking for PS8001 to PS8006, but I don't know what the D board is or
    what it looks like. Can you tell me where to find D board?
    =================================================

    D Board is the same board where you replaced convergence out chips (STKs) and PS8001 to PS8006 are located near these chips.



  • Shahid Electronics
    Shahid Electronics Mar 15, 2010

    all PS are safety pico fuses and replace only that in case any of them found blew off/ open.
    Do not replace all of them unnecessary. Check above said pico fuses and if any one found open/ blown, replace only that one.



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