Question about LG 50PX4DR 50 in. Plasma TV

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Screen just suddenly went dark!

Screen just suddenly went dark although you can make some images out in the darkness! We have had this LG 42 inch plasma for approximately 2 years. Is it worth getting fixed or just scrapping it? Cost approx £800 new. Thanks

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  • tarheel0123 Feb 23, 2009

    The same thing happened to me.  I turned the TV on that I have had for about 3 years.  I made a soft bang sound and lost the resolution.  I can see a faint picture with dark streaks that appear and disappear all over the screen.  Do I need to junk this or were you able to solve the problem.

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If you can see a faint picture with streaking you most likley have a defective Zsus module Part Number 6871QZH036B Description PWB(PCB) ASSEMBLY,DI List $226.14 Please rate my info

Posted on Feb 20, 2009

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Lg42pc1r suddenly click while playing (same click as you turn it on/off), and image went dark. Sound still works, but no image.


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hi, usually you can correct this issue with only a few system checks, dark streaks can be caused by damaged pixels on the screen, in which case you need to replace the TV.
  • Inspect where the dark streaks are on the television. If the streaks occur at the same place on the top and bottom of the screen, they are due to the formatting of a movie or television show you are watching. This is normal. Also, if the streaks appear on the left and right of the screen, they are due to the show being filmed in full-screen instead of wide-screen. This also is normal.

  • Change the input setting so you are viewing the contents of a different device. If the dark streaks are gone, you know they are due to the device connected to it. However, if the dark streaks remains no matter what input the TV is connected to, the problem lies with the television.

  • Inspect the cable connection. Oftentimes when connecting a computer to an LCD TV, you can have strange dark streaks across the screen. Use a DVI-to-HDMI cable connection when plugging in your computer, then press the "Menu" button on your TV remote, select "Picture" and chose "Square Pixel." See whether the image adjusts and the dark streak goes away.
  • Contact the manufacturer of your LCD television if the dark streak remains. This streak can be caused by a defect in the television; if the TV is still under warranty, you can have it replaced.
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    Tv has died


    When the TV is on, if you look at the screen and can see dark images, then you will need to replace both the inverters. The inverters drive/power the back light inside the LCD to show the images. You may have to try and different channels and or inputs to truly see if you can see dark images while the TV is on. If you are hearing audio from a channel or an input then you should be able to see the dark images if just the inverters are bad.
    If the screen is dead black without any dark images, then typically your LCD screen/module is bad.
    If the TV powers up (power supply is good), you have audio and the remote will work with the TV (the main board is good), the only parts left is the inverters or the LCD screen/module.
    I can get you LG part numbers if you need them.

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    Have 42 inch LG flat screen...for about 3 years...


    Take the back off with no power connected..You should have 2 invertor pcbs..one on the left and one on the right..well the side of the picture you cant see is the same side of the faulty invertor..replace this and this should solve the problem.it is the cheapest option..if not..im afraid is is a new LCD screen unless you are prepared to take it appart and replace backlight bulbs :)

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    Most likely what happened is one of the capacitors went bad. When a capacitors goes bad it produces a popping sound. This could be an easy and cheap fix if you find the bad capacitor or capacitors. The bad capacitor will have a bulging top most likely on the power board but could be anywhere.

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    maybe the inverter board for the screen issue- the power issue seems to be LG has power board design flaw- basically last time I looked the power board is manufactured NOT by LG but by H&E ...who designs this stuff??

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