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White wavey lines with dots or speckles.

At turn-on the screen is blue and good. Apply video and there is white wavey lines with dots. Picture color is fair to good. Checked all the caps on the RF board and Power Supply . They look good, no bulging.

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  • Bob Browning Oct 21, 2008

    Sorry, That is not my problem. The wavey lines are over the whole screen and the video that I am using is from a DVD and the lines are also when I am on satellite.

  • Bob Browning Oct 21, 2008

    The model number is AKAI LCT42Z6TM. Yes I am a technician (retired ??)

  • Bob Browning Oct 21, 2008

    AKAI LCT42Z6TM , 2 years old.

  • Bob Browning Oct 22, 2008

    Problem solved !!! Replaced C-320 capacitor (100ufd/35v) located on the upper left corner of the video board.

  • Bob Browning Oct 22, 2008

    Problem solved ! Replaced C-320 (100ufd/35v) cap. on video board

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3 Answers

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  • Master
  • 6,966 Answers

Hi,

To my understanding, a wavy line/component on video indicates possible AC hum in the signal line. On the other hand, dots or speckles would indicate noise/interference injected into the video signal. Course of diagnostic action may then involve:

  • checking/replace video cables/ connectors, plugs. jacks;
  • check/remove electrical noise/intereference sources such as lamps with electronic ballasts, electronic lamp dimmers, wireless phones;
  • check/replace filter capacitors.
Hope that this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Oct 21, 2008

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  • Master
  • 899 Answers

What kind of flat panel /make/model # ?
it could be alot of things , but if I don't know what tv you have I can't help you to find the problem.
it seems that you may be able to do some unsoldering and or soldering chips in and out, can you?
if so I can help

Posted on Oct 21, 2008

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  • jason Oct 21, 2008

    then the problem will be in the video processing circut

    let me do little look and i'll be back with some suggestions for the video processing failures that occur in your piticular set

    but I can tell you that alot of high watt resistors lose value quick , also diskcaps have a tendency to fail lately in alot of video probs and no video , and electrolitic capacitors are drying up and becomming an open on the DMM



    Electech

  • jason Oct 21, 2008

    ok the only thing I can find on that is some bad discaps and resistors

    but the lines created vari with no exact location as to each symptom
    even though there are both vertical and horizontal lines but said one culprit could be a 120nf discap

    so check that out and make sure all that solder looks good , check for any brown on the board that might indicate a threat , and the problem will be before the blue screen circut so check solder joints at the tuner also

    let me know if you catch a disk cap , it will heat up when failing



    electech

  • jason Oct 21, 2008

    one of those is off frequency sending it into the screen

  • jason Oct 21, 2008

    also possibly the crystal at the EEPROM

  • jason Oct 22, 2008

    thought it was a cap, was it dried up or bulgging?

  • jason Oct 22, 2008

    your going to want to check C280, C302,, C323, and C336 100uf 35v caps also because they are doing the same, I think it's thier manufacturing date, because those all seem to be failing not just in this tv

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The "white line" at the top of the screen is usually associated with "VBI Information" - the stuff that carries closed captioning, etc. This is usually only visible on upconverted SD material on HD channels and is usually the fault of the affiliate not doing the upconversion properly.

Posted on Oct 20, 2008

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