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Problem with Panasonic PT-47WX49 47 in. Rear Projection Television

my panasonic pt-53wx42f has blue lines what can i do?

Posted by avatar on Nov 01, 2009

    • By avataronthe101 May 11, 2010

    • To SD Tech and asnowman - The same thing described in this thread has happened to my TV, which is also a Panasonic PT-53WX42F, Chassis EP824. SD Tech, you mentioned something about the OP letting you know if he or she isn't able to solder it so you could give some options. Well, that describes me. Do you know of any options that won't cost more than the TV is worth? Thank you both for the great posts.

Solutions (3)

Best Solution

If you cannot move a certain color, red or blue then you may have more going on than just an adjustment.

What you might be experiencing based on your symptom sounds like a damaged convergence IC.

With any Projection Television that has a damaged convergence IC, you do not want to continue the use of the set. If the IC’s continue to fail they will cause a short in the power supply and cause your television to not power up, and possibly damage the CRT’s in the set.

With that aside I have some support suggestions that I have put together that may help you make an informed decision.

You should be able to get a local service center to repair this at your house for between $350.00 - $450.00, If you want to repair this set yourself, I have some instructions below that will be a help to you.
While it is not a very hard repair, this repair can be a bit tricky. If you have a 45W soldering iron, solder, solder wick, and heat sink compound you can repair it yourself.

When you remove the old IC's, please be sure to remove all of the old heat sink compound, as it can act as an insulation for the new IC's and cause them to overheat. I usually clean the heat sinks with alcohol and a small rag.

There are two and large IC’s that control the convergence in a big screen set. Some of the newer sets only have one. If you only have one, it is right in the middle of the set on the center circuit board. They are secured to a very large aluminum heat sink. They will have a part number stamped on them that will start with an STKXXX-XXX, like STK392-110.

Along with the convergence IC’s there will also be some associated components that will need to be replaced as well. There are some resistors that are part of the convergence circuit that will be open and need to be replaced. Most likely these will appear charred in the center. If you have an Ohm Meter or a DVM, check all the resistors that are close to the IC’s and you should be looking for either ones that have opened or have changed values.

If one of the convergence IC’s are found to be bad, I would replace them both, if one has gone bad the other may go soon. I usually order my parts from Andrews Electronics in California, they will have the OEM components that you will need.
Their site is http://www.andrewselectronics.com/welcome.aspx
And their phone number is a 24-Hour Order Desk: (800) 274-4666
I recommend the phone order so you can talk to the person about the different types of IC’s that are available.

I would also advise that the convergence IC’s be OEM or better, just because they are cheap does not mean that they are a good deal. I have seen the cheap IC’s fail after a short time, even though they look exactly like the OEM IC’s. I think that the bottom line is that you will get what you pay for when it comes to the parts.

You can also try http://www.tvrepairkits.com/ , I have not tried them yet, but they do carry OEM or better parts.


I hope this information allows you to resolve this issue.
If you need further assistance please comment to this post and I will try to help you further.
Thanks for using FixYa
asnowman

I have attached some photos of really bad convergence problems; your picture may not be exactly as bad as these.



Go INTO the customer menu and select CONVERGENCE--what you are looking for is will blue or red not move in some direction?

If you find in your case blue is wacked and will not adjust let me know--I can post here start to finish instructions for this repair on this set.....

You only need to be able to know how to solder and get at the chips--you can buy a pair of the chips on Ebay for less than 14 dollars plus shipping.

If you cannot do it yourself--let me know and I will give you options.

I am here to help people--if this information helps you rate this solution--I do this here for free.

SD TECH

    • By avatarSD Tech Nov 02, 2009

    • The other tech's solution is too vague--mine is the best way to fix this--ignore the first part--get these instructions and decide for yourself:


      What you will need;


      Two new STK-392-110 convergence Ic’s


      Solder


      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


      A PAIR OF GLOVES






      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
        removed)

      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
        grill).

      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
        edges.

      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
        pinched.

      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.

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

Ok i have tried this and it is not easy evidently i had solder to close to the other pins and when i turned on something inside smoked is there away to just get another board for it? i dont even know what kind of board to ask for.

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