Question about Panasonic PT-47WX42 47" Rear Projection Television

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PT-47wx42 color problems

The only problem I am having is a transparent blue and green below the blue curving across the top and bottom of screen. Kind of looks like a someone took a spray can of blue and sprayed it across the top and bottom of screen except it looks like a wave on both bottom and top of screen. The strip of blue is about 5 inches wide and the green following just below the blue is about the same size.

I tried the convergence 1 (lined it up to hash marks on TV and went thru the other colors and lined them up) and 2 and it is most evident on convergence # 2 that the blue will not line up with cross marks. I tried the #2 convergence but no matter what the blue will not line up with the hash marks. The blue is high on the upper left hand corner (the hash mark is yellow). The blue is also hign on the upper right hand corner. The lower left hand corner is high and the center bottom is slightly high. It is as close I as can get them by convergence.
Help, how do I align these colors that just went bad one day? Thanks
My email is donla@adelphia.net

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  • donla Feb 09, 2008

    The TV is about 5 years old and the blue and green problem is transparent. The rest of the picture is fine, just these stationary waves of blue mainly and the green below it. Thank you

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Hi
 Resolder the Thermal Deguassing Cube. It is usually Black, about 3/4 inch cube and will be located close to the deguassing coil plug coming from around the Picture Tube

Good Luck
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Posted on Feb 09, 2008

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  • PRIYABRAT  PATTANAIK
    PRIYABRAT PATTANAIK Feb 09, 2008

    There are so many possibilities. It could be a dead projector tube, leaking cooler fluids, bad power supply connection, broken connector pin and so on. You really need someone who can get inside and find out the cause of failure; it requires one who knows how to observe, take measurements
    and track down the various possibilities. It is not an easy job on this one and it is not a home remedy solution, sorry to say.
    For the beginner, here are two things you can do - and they don't cost anything.

    ONE: Do a hard reset. Unplug the power cord for 4 full hours, then power it up again.

    TWO: Give it the banging test. Smack the set vigorously with your hand or fist in various places. Doing so will often reactivate a loose connection or cold solder joint. This may bring the red gun back to life - let's give it a 35% chance of doing so.

    If these two procedures don't help you are going to have to bring in the big guns.

    Just a comment: There are over 3,000 parts in a set of this kind not counting themillions of transistors buried inside the several integrated circuits. There are about 12 totally independent sections that function on their own as well as interface
    with all the other circuits. It is not something easy to do. Even a trained and experienced PHD in Electrical Engineering does not have the foggiest idea about what goes on inside a tv without extensive training in television receiver theory and practice.
    So, don't feel overcome with it all; there are few who really know this business.IT is truly esoteric in nature.

    Good Luck
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  • PRIYABRAT  PATTANAIK
    PRIYABRAT PATTANAIK Feb 09, 2008

    You may want to try purchasing a video test tape with color bars and this tape will also have a test pattern for all red screen, all green and all blue. With this you should be able to determine if the picture tube is weak or a fault with the color drive circuits is at hand. You will need the color bars on the screen to adjust the tint control from left to right fully to see if the three colors will show up.

    Good Luck
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  • PRIYABRAT  PATTANAIK
    PRIYABRAT PATTANAIK Feb 09, 2008

    The solution and comennnt will solve your problems

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  • 3,422 Answers

Hi,

This could be a heater-cathode (H-K) short in the CRT, a failure of a component in the chroma circuits or video output (driver board), or bad connections there or elsewhere. Don't panic - heater-cathode shorts in CRTs can often be worked around.
Note: before proceeding, it is a good idea to make sure that the screen is degaussed - else you could be attempting to track down problems with the wrong color!
Some simple tests can confirm or rule out other possibilities.

  • Compare the voltages for the video drive signals to the CRT on the little board on the neck of the CRT with the CRT both connected and unplugged. A schematic will help greatly in locating these signals.
    • If there is a significant difference especially on the bad color, then the CRT is a likely candidate. Try tapping the neck of the CRT GENTLY (with it plugged in and while viewing a picture) to see if it is an intermittent problem.
    • If there is no significant difference, you may have a bad driver or a problem in the chroma circuits.

  • Look for bad connection/cold solder joints, probably on the little board on the neck of the CRT. Use an insulated stick to gently prod the board and its components in an effort to induce/cure the problem. Look carefully for hairline cracks around the component leads.
  • You can swap components between two colors and/or test with an ohmmeter on that driver board to determine what is bad. The nice thing about color monitors and TVs is that there three copies of each of these components. Swapping and/or comparisons between these is an excellent diagnostic technique.
  • Another simple test: Disconnect the cathode for the full-on color from its drive. If it is still full-on, there is probably an H-K short in the CRT since the only way to get each color on the screen is via the cathode connection to the CRT neck board. If it is removed and there is still that color, the current must be taking another path inside the CRT.
  • Alternatively, interchange the outputs of the bad color with a good one by jumpering on the video driver board (on the CRT neck). If the bad color changes, then the problem is in the circuitry and not the CRT.
So you have to get a tech if the above method doesn't solve your problem and get it fixed..

Goodluck,
Please don't forget tor ate me as fixya..

Posted on Feb 09, 2008

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