Question about LG L4200A 42 in. HD-Ready LCD Television

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LG L4200A WHEN PUSH THE PWR BUTTON THE BACKLIGHT COMES ON BUT THERE IS NO OSD OR ANY TRACE OF DISPLAY . THE SCREEN IS BLANK WITH LIGHT GRAY COLOR SHOWING THAT THE BACKLIGHT IS ON

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  • Anonymous Mar 02, 2008

    I have the same problem

  • Mats Gustavsson Aug 24, 2008

    Yeah, same problem here, backlight on but no picture, no OSD, nothing. One red LED is lit on the powersupply circuit. Have measured up the cables that goes from powersupply to the signalboard and everything looks ok. Please help !!

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Hi again !
After a few (6) hours of troubleshooting i finally fixed it !!
Underneath both powersupply and signalboard, there is a third circuitboard that sends the signal to the monitor it self (i guess). On that board there was a small, small fuse, it said F1 and 1,5A, 63V.
Soldered two cables and put a regular glass-fuse instead. Voila, it works !! Hope this helps for someone else.

Posted on Aug 24, 2008

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My 42" LG did that exact same thing all it was was a 71 cent capacitior that controls the input functions. It is located on the main power supply board on the left side of the tv (with the back off looking at the back) if this is your problem you will be able to see the end of the capacitior buldging out a little bit (if you dont know for sure ASK someone) If you can't find the capacitior you need anywhere local go to jameco.com they will have anything you'll need just make sure you get the same microfarad rating. Hope this helps someone.

Posted on Oct 15, 2008

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Lg tv power light comes on but screen stays blank


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Troubleshooting Flat Panel Monitor issues. Screen is blank and power indicator...


Troubleshooting Flat Panel Monitor issues.

Screen is blank and power indicator is off

The monitor is possibly not receiving power. Perform the following steps to fix the problem:
  1. Ensure that the electrical outlet and the monitor are both switched on.
  2. Check that the power cord is firmly plugged into the electrical outlet and the power supply unit.
  3. If the power cord has a removable fuse, replace it.
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  5. Try another electrical outlet.
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Brightness and Contrast may be too low. Adjust the brightness and contrast using the On-screen display controls (OSD) by selecting the button
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The monitor is in the Power Management Standby state. The power management feature is invoked when the computer recognizes that you have not used your mouse or keyboard for a user-definable period. Perform the following steps to bring monitor out of the power management state:
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  2. Check the Power Management software on your computer.
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Screen is blank and power indicator is flashing green
Display mode of the computer is outside the range of the monitor. The display mode the monitor uses is controlled by your computer. Therefore, you should refer to your computer's documentation for details on how to change display modes.

The image size, position and shape may change when the display mode changes. This is normal and the image can be readjusted using the IMAGE SETUP and the monitor controls.

Note: Unlike CRT monitors, which requires a high refresh rate to minimize flicker, TFT technology is inherently flicker-free. If possible, configure your computer for 1600 x 1200 addressability at 60Hz vertical refresh rate.

Use the following table as a guideline and reconfigure your computer to use a supported display mode. The highest resolution (for example, 1600 x 1200) produces the optimal output, but limitations of your monitor may prohibit this setting. Adjust the addressability mode until an image appears.

CHECK SIGNAL CABLE" message is shown and power indicator is steady amber.

The monitor is not receiving a video signal. Perform the following steps to fix the problem:
  1. Check that the signal cable is firmly connected to your computer
  2. Check that no pins are bent in the signal cable connector.
There are noises in the video signal. The IMAGE SETUP function is used to adjust the level of noise in the video signal which causes horizontal lines or areas where the image appears to be unstable and jitters or shimmers. This can be done automatically or manually.
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Image appears to be discolored

The color setting may be incorrect. Perform the following steps to adjust the color settings:
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A few dots are missing, discolored, or inappropriately lighted

A small number missing, discolored, or lighted dots may be present on the screen, which is an intrinsic characteristic of the TFT LCD technology and is not an LCD defect.
Using On-Screen display (OSD) controls
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OSD main menu:

Note: The LCD monitor needs time to become thermally stable the first time you turn it on each day. Thus, to achieve more accurate adjustments for parameters, allow the LCD monitor to warm up (be on) for 15 minutes before making any screen adjustments

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