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

2 Answers

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

Posted by on

  • 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 !!

×

2 Answers

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

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

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

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

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Lg 50ln5600 backlight issue


Check whether the back-light start voltage [control voltage] comes to the backlight inverter section of the power board; from the main board. It sounds that that voltage does not come from the main board, after the firmware has been loaded up. If so the main board will have the fault. Contact any service technician.

Aug 03, 2015 | LG Televison & Video

2 Answers

Black screen for HDTV channels -- but TV menu and DVDs display normally


Try hard reset, Please unplug the tv cables and power cables for 30 min and redo the cable and check its working ....




Good luck...

Aug 01, 2008 | Hitachi 42HDS69 42 in. Plasma Television

Tip

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.
  4. Try another power cord.
  5. Try another electrical outlet.
  6. Check the power connection at the back of the panel.
Screen is blank and power indicator is steady green

Brightness and Contrast may be too low. Adjust the brightness and contrast using the On-screen display controls (OSD) by selecting the button
Screen is blank and power indicator is steady amber

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:
  1. Press any key on the keyboard or move the mouse to restore operation.
  2. Check the Power Management software on your computer.
  3. flatpnlmont12.jpgPress the (OK) key to switch between analog and digital mode. If the panel is the wrong mode for the signal being provided, the monitor appears to go into sleep mode.
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.
Note: It is not applicable to digital input.
Use the image setup fix the problem:
  1. flatpnlmont6.jpgSelect (Image Setup) menu in the OSD.

  2. Select Manual to adjust CLOCK/PHASE settings.
Image appears to be discolored

The color setting may be incorrect. Perform the following steps to adjust the color settings:
  1. flatpnlmont8.jpgSelect (Image Properties) from the OSD menu.
  2. flatpnlmont9.jpgSelect (Color Properties) to adjust the color mode you find most comfortable or fine tune the colors using the Custom menu.
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
flatpnlmont12.jpgThe settings adjustable with the user controls are viewed through the OSD. Press the (OK) button to display the main OSD menu.
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

on Aug 08, 2010 | Televison & Video

1 Answer

Hi, I have a Westinghouse 42"


The only other thing that I would think to replace on this is the power board. You may have bad power going to the main board. Other than that you may be at the point of no return on that TV.

Mar 01, 2011 | Televison & Video

1 Answer

LG 37LC7D HDTV just went blank. Screen blacked out and green light is on but no response to input change, remote, volume, or channel change. I've unplugged it for several minutes in an effort to reboot...


My lg 37lc7d is having the same problem. My backlight is on but no display. Also the standby light blinks several times then the screen goes on but it's just all black. No a/v

Feb 08, 2011 | LG 37LC7D 37 in. LCD HDTV

1 Answer

LOOKING FOR PICTURE SETTING SAMSUNG MO.NO.LN-T5265F


This may help you...you can also get an owners manual free on line.


English - 23
Using Automatic Picture Settings
Your TV has Three automatic picture settings ("Dynamic", "Standard", "Movie") that are preset at the factory.
You can activate either Dynamic, Standard, Movie by making a selection from the menu.
1. Press the MENU button to display the menu.
Press the ENTER button, to select "Picture".
2. Press the ENTER button to select "Mode".
Press the ??² or ??¼ buttons to select the "Dynamic", "Standard", "Movie" picture
setting. Press the ENTER button.
?³ Choose Dynamic to increase the clarity and sharpness of the picture.
?³ Choose Standard for the standard factory settings.
?³ Choose Movie for a natural Image without picture enhancements.
3. Press the ??² or ??¼ buttons to select "Contrast", "Brightness", "Sharpness",
"Color", or "Tint(G/R)", then press the ENTER button.
4. Press the ??? or ??? buttons to decrease or increase the value of a particular item.
For example, if you select "Contrast", pressing the ??? button increases it.
Press the ENTER button.
Press the EXIT button to exit.
• When you make changes to Contrast, Brightness, Sharpness, Color, Tint(G/R)
the OSD will be adjusted accordingly.
• When in PC mode, Tint, Sharpness, and Color are not available.
Press the P.MODE button on the remote control repeatedly to select the desired
picture mode.
Picture Control
Move Enter Return
Mode : Dynamic ???
Contrast 1 00
Brightness 50
Sharpness 85
Color 55
Tint G 50 R 50
Balck light 1 00
??¼More
TV Picture
Move Enter Return
Mode : Dynamic
Contrast 1 00
Brightness 50
Sharpness 85
Color 55
Tint G 50 R 50
Balck light 1 0
??¼More
TV Picture
Dynamic
Standard
Movie
Move Enter Return
Mode : Dynamic ???
Contrast 1 00
Brightness 50
Sharpness 85
Color 55
Tint G 50 R 50
Balck light 1 0
??¼More
TV Picture
50
??² Con trast ??¼
Move Adjust Return
English - 24
Adjusting the Color Tone
You can change the color of the entire screen according to your preference.
1. Press the MENU button to display the menu.
Press the ENTER button to select "Picture".
2. Press the ??² or ??¼ button to select "Color Tone", then press the ENT ER button.
3. Press the ??² or ??¼ button to select "Cool2", "Cool1", "Normal", "Warm1",
or "Warm2".
Press the ENTER button.
When the picture mode is set to Dynamic or Standard, Warm1 and Warm2
cannot be selected. Movie mode is only available.
Move Enter Return
??²More
Color Tone : Cool2 ???
Detailed settings ???
Size : 16 : 9 ???
Digital NR : Low ???
Active Color : On ???
DNle : On ???
Reset : OK ???
TV Picture
Move Enter Return
??²More
Color Tone : Cool2
Detailed settings
Size : 16 : 9
Digital NR : Low
Active Color : On
DNle : On
Reset : OK
TV Picture
Cool2
Cool1
Normal
Warm1
Warm2
Activating Backlight
You can adjust the screen brightness by adjusting the LCD backlight brightness. (0~10)
1. Press the MENU button to display the menu.
Press the ENTER button to select "Picture".
2. Press the ??² or ??¼ button to select "Backlight", then press the ENTER button.
3. Press the ??? or ??? button to decrease or increase the valueof the backlight
brightness.
Press the ENTER button.
Press the EXIT button to exit.
Move Enter Return
Mode : Dynamic ???
Contrast 1 00
Brightness 50
Sharpness 85
Color 55
Tint G 50 R 50
Balcklight 1 0
??¼More
TV Picture
5
??² Balcklight
??¼
Move Adjust Return
Move Enter Return
??²More
Color Tone : Cool2
Detailed settings
Size : 16 : 9
Digital NR : Low
Active Color : On
DNle : Off
Reset : OK
TV Picture
OK
Cancel
Resetting the Picture Settings to the Factory Defaults
1. Press the ??² or ??¼ button to select "Reset", then press the ENTER button.
Press the ??² or ??¼ button to select "Cancel" or "OK" then press the ENTER button.
Press the EXIT button to exit.
Each mode can be reset.

Feb 04, 2011 | Televison & Video

3 Answers

I was watching the tv, when the screen went blank but the voice was still on, then smelled something awful, like something plastic melting, then noticed a lot of smoke coming up from the back of the...


Hi,
Most probably, Electrolytic condenser in the Power supply to display circuit may have punctured resulting in smoke coming out. Take tv to service centre. There is no other option.
Good luck.
Rating the solution is highly appreciated.

Mar 15, 2010 | Polaroid TDA-03211C 32 in. LCD HDTV

3 Answers

I have 140 LG 32LC7DC LCD TV's. 14 out of 140 failed. They would not power up. Have you heard of this problem with this model of LG?


Power Supply board is dead.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

Mar 02, 2010 | LG 32LC7DC 32 in. LCD HDTV

1 Answer

3 year old 42in LG LCD TV scrren went blank


You will either have a fault with the inverter board which drives the backlights or a faulty backlight in the screen. If the problem is a backlight then a replacement screen is the only cure. One or the other is breaking down after it has been opn for a certain period of time, have an engineer call out & check with a tester if it is a screen problem.

Dec 19, 2009 | LG 42LC2D 42 in. LCD HDTV

1 Answer

LG LCD TV 32LC4R BLACK SCREEN


same here How do you change the Power regulator?

Oct 28, 2007 | LG L4200A 42 in. HD-Ready LCD Television

Not finding what you are looking for?
LG L4200A 42 in. HD-Ready LCD Television Logo

413 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Televison & Video Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

The Knight
The Knight

Level 3 Expert

69654 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18330 Answers

Are you a LG Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...