Why does my TV have no picture? LG TV repair

TV is one of the most common appliances in every home. T.V is the source of fun, entertainment, and communication. One can get time to time information around the world by watching TV. Best LG TV Repair Service center provided by Doorstep Hub.

Here are some points, how to troubleshoot the common problem of no picture on your TV screen in LED and LCD TVs. We will be using the flashlight test to help with the troubleshooting while determining the problem.

The flashlight test will show how to recognize if you have any video appearing on the screen and whether or not you have backlights. Within this test, we will show how to determine if the problem is a bad T-Con board, the bad main board or bad backlight inverters for LCD TVs or LED drivers for LED TVs.

Most of the LCD TVs are made up of

• Main Board
• T-Con Board
• Power Supply Board
• Backlight Inverters

The number of backlight inverter may differ from one TV to another TV. Some TVs have one backlight inverter or two backlight inverters or the backlight inverter is built into the power supply board.

Most LED TVs will have

• T-Con Board
• Power Supply Board
• Main Board and 
• LED Driver Board

Some LED TVs will have the LED driver board is built into the power supply board.

Problems:

If you have no picture on your screen, the first thing we want to look at is to see if we have backlights or not. You can do this in a few different ways.

First is by looking through the back of your TV and seeing if you can see white lights shining through holes on the panel.

You can do this in a few different ways

    1.  If you can see white lights shining through the holes on the panel.  Now you can see the backlight is on through the top vent of the TV. If it is too difficult to notice if your backlights are on or not, with the backlight still on, you may need to remove the back cover of your TV and see for the light shining through the panel.

• Once you have determined if you have backlights that are not working, you can then move on to the next steps.
• If the backlights are working, but you have no image on the screen, that indicates the problem is either the T-Con board or the Main Board.

2. You want to see if you can hear audio. If you cannot hear audio, once try and remember if you had audio immediately after the TV image went away on the screen. Or you can also cycle through the inputs to see if you can hear any audio on any of the inputs.

For Example, you can connect your cable box to your TV and try to find the input that cable box identifying that it be sending audio to the TV.

• If you do have audio and you do have backlights, it is recommended to start by replacing the T-Con board as that will be the fix, the majority of the time.
• If you definitely have no audio and you have backlights, then the problem could either be the T-Con board or the main board. You need to replace each board individually to see which one fixes the problem.
• If you do not have backlights, you want to turn all the lights off in the room and get a flashlight. Apply power to your TV and press the menu button on your remote to pull up the menu on the screen. You will not able to see the menu until you shine a flashlight on the screen.

Flashlight Test:

You may require twisting the flashlight and trying different angles to be able to see the menu. You can see the menu on the screen and even read the AV1 on the screen. This shows your TV has no backlights, but the image is showing up on the screen, thus our inverter and LED driver is bad and our T-Con and main board are good.

You can turn the menu on and off on your screen to notice that the image appears and then disappears. At this point, you want to replace the inverter or LED driver or the power supply, if it has the inverter or LED driver on it.

Solutions:

So as a concise overview

• If your TV does have backlights and has audio, it is recommended to replace the T-Con board first.
• If your TV does have backlights but does not have audio, then it is either a bad T-Con board or main board and each board will need to be replaced individually to see which one fixes the problem. 
• But you don’t have backlights, but you see an image on the screen with the flashlight, that means that your main board and T-Con board are good and that you will need to replace the backlight inverter or backlight inverter on your LCD TV and the LED driver on your LED TV.

This information will just guide how to diagnose the problem but will not guarantee to fix the issue. If you need to fix the issue consult LG TV Repair Service center.