Question about LG 62SX4D 62" Television

1 Answer

The picture flashed green to black several times and the image went askew. Then everything went black and stayed that way. Sound remained on. After a few minutes, I tried to turn the unit back on and it did the white up and down lights ending with the two top lights on (now red). I have changed bulbs twice before when this happened and that fixed it. This time it didn't. One new thing that happens now (I know this is weird) is that when I turn it on the set chirps in the vicinity of the bulb and then it once again the TV turns off. I have tried unplugging the set for an hour as a read somewhere else. No help.

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  • Lauren Carhartt Mar 24, 2011

    A "factory trained" tech replaced the ballast 6 months ago. Your answer makes perfect sense. Thank you

  • Lauren Carhartt Mar 24, 2011

    Thank you again.

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  • LG Master
  • 2,098 Answers

Hi lc99527,
This is an indication of faulty ballast board and or its power supply(gone to out-of-regulation) and once sense by the feedback circuitry it will automatically shuts off the power supply. First check for bad solder joints (crack/cold/dry joints) in that section. This is hard to spot, I would advice you use table/portable lamp or work in the brightest area to locate it. Once found, resolder it. Also check for leaky/dried electrolytic capacitor. Sometimes it has a bulged at the top but not all, you must have a capacitor checker to determine its condition. Shorted driver transistor in the ballast board will do the same symptom as well as faulty ballast transformer.
Isolating the symptom is technical and if you don't have necessary tools and test instrument and can't do the job yourself, I would advice you to look for a qualified technician to troubleshoot the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Posted on Mar 24, 2011

  • Jdvillanueva
    Jdvillanueva Mar 24, 2011

    Welcome, thanks for using Fixya and again have a nice day!

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