Question about Panasonic PT-53WX53 53" Rear Projection HDTV-Ready Television

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My power turns on then the light will blink three times and I have no picture

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  • Panasonic Master
  • 14,553 Answers

My power turns on then the light will blink three - 807f83d.jpg
Here is what is causing your problem.

Three blinks is short protection and 98% of the time in this set it means one of the two STK-392-110 CHIPS used for convergence is shorted.

With the set UNPLUGGED, remove the back cover and locate the two chips mounted side by side on metal heat sinks with fins--they will have the full number printed on the front of them in white letters.

Take a good look at all the light blue resistors in front and around them--all the ones marked 2.2 need to be looked at to see if even one is white in the middle (discolored). They can all be tested just like checking a fuse.

Most shops are going to charge 300 or more for this kind of repair---BUT you can buy a pair of the chips on Ebay for less than 13 dollars plus shipping--I would upgrade them by using STK-392-150--same part but longer lasting.

Total parts cost should be under 30 dollars total. If you or someone you know can do it I HAVE STEP BY STEP, START TO FINISH INSTRUCTIONS FOR THIS REPAIR IN THIS SET.

They tell you everything you will need and how to do it--usually takes about a hour--longer if you are doing it the first time.

Let me know if you want the instructions and I can post them here for free.

If this has helped you rate this solution as I do this here for free.


Posted on Dec 10, 2009

Testimonial: "Thank you so much for your help. I would also like the step by step please. My TV has been out for over two months. Once again thanks for the advice."

  • SD Tech
    SD Tech Dec 15, 2009




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    What you will need;

    Two new STK-392-110 convergence Ic’s


    Liquid solder flux

    Desoldering braid or wick

    A good soldering Iron

    Some denatured alcohol

    A small toothbrush

    A Philips screwdriver or screw gun to REMOVE SCREWS


    1. UNPLUG
      TV SET.

    2. Remove
      back cover of TV set.

    3. Remove
      entire front speaker grill on set(it pulls off and may resist being

    4. Locate
      and unplug speaker wires (they are plugged into the main circuit board).

    5. Locate
      three cables with wires that come from the Front keyboard—two of them have
      to be unplugged from the main board(all plugs are different sizes but note
      where they go)

    6. Remove
      2 long philips silver machine bolts from the front of the set (behind the

    7. Remove
      4 more in the back of the set; two
      are located at the extreme back edge of the plastic frame and hold the
      chassis down; two more are located on either side and also go straight
      down; note which are which and set them aside.

    8. Using
      gloves pull the entire metal box (it is called a light box) out of the
      set; there are hand holds on either side—careful as the metal has sharp

    9. Remove
      the box from the set and locate the two Convergence IC chips; they are
      located on identical metal heat sinks with fins and they should have the
      STK-392-110 number clearly printed on them in white (they are black)

    10. Turn
      the light box over on its side and UNSOLDER ALL 18 PINS ON EACH IC. It is
      a good idea to apply liquid solder flux to the pins on both chips now. I recommend using a de-soldering braid
      for this—get all the pins completely de-soldered.

    11. Inspect
      the dozen or so light blue resistors in front of them; most are marked 2.2
      ohms—if any are white in the middle you will need to replace them at the
      same time; best way is to check all of them like checking a fuse----they
      protect the set if one of the STK’s shorts in any way.

    12. With
      the STK’s completely unsoldered turn the box upright and remove the two
      screws on each IC. If the chips
      have never been replaced you will need to tap them loose with a putty
      knife or flat bladed screwdriver.

    13. Remove
      both IC’s.

    14. Apply
      heat sink grease to the two new IC’s and install them one at a time; this
      part can take some time and it is important the pins on the new IC’s are
      perfectly straight---once you get them in, Hand tighten both the screws on
      each IC---do not use a screw gun—you can strip the screw holes out. Clean the bottom of the circuit board
      where the chips were soldered with some denatured alcohol and apply liquid
      solder flux to all the pins.

    15. Presuming
      you have already found/replaced any bad resistors turn the box back over
      and solder carefully both of the two new IC’s in, --do not short any of
      the pins to each other when you do this and when you are done it is a good
      idea to take a close look at both to make sure all pins are soldered and
      not touching each other with soldering you have just done. I suggest you
      do clean the pins on the bottom of the circuit board again with denatured alcohol.

    16. Slide
      entire light box back into the cabinet.

    17. Reconnect
      the plugs you removed when you removed the box. At this point take a lens
      cloth or a paper towel with glass cleaner sprayed on it and clean the
      three large black lens-if they are dusty the picture will be darker and
      not as clear as is should.

    18. Position
      the box so it is all the way in place and none of the wires or plugs are

    19. I
      usually at this point turn the set on before I replace the Six bolts that
      hold it in—2 from the front and the four in back----this way if you have a
      problem you can remove the box faster.

    20. If the
      set comes on and now has normal Convergence go into the customer menu and
      adjust the convergence in the multi-point mode----CAREFUL! THE FIRST
      OPTION this set usually offers is a
      green cross in the middle of the screen—do not adjust Green!

    21. Once
      you have the Red and Blue in the center adjusted find the second
      convergence mode---it will give you 8 or nine points on the screen with
      instructions on how to change from blue to red---use the original remote
      with the thumb wheel or cursor buttons to adjust.

    22. NOTE:
      SOME of these sets need to have the Convergence adjusted in first:
      full/4:3 and second in the other two zoom/wide zoom and third on the HD
      input with a HD signal coming in.
      There is also an option at this point to go into the Technical menu
      and fine adjust the convergence all over the screen—if you need this I can
      give you instructions based on the model you have—most of the time
      adjusting the set in the customer mode will produce a good result.

    23. I know
      all this may seem complicated to you, but this repair should take about an
      hour or so and just take your time when you get to adjusting the set.

    24. If all
      looks good turn the set off and Unplug it; install all 6 of the chassis
      bolts back; replace the back cover and the Speaker grill and plug the set
      back in.

    25. You
      may find it useful to go over the convergence Adjust again—to get all the
      points as good as you can. There is
      a hidden Tech menu that will allow a finer adjustment of the entire
      screen----it is somewhat difficult to access and there are a lot of
      buttons on the remote that then do different things.

    Most of the time adjusting in the customer menu will
    give you a very acceptable picture.



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