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Stanton Naill Posted on Apr 01, 2017
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Have an LG 55uf6450-ua tv. I have backlights but no picture, just a blue screen. Replaced power and t-con boards but no change. Main board? Thanks

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richie46

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  • LG Master 12,962 Answers
  • Posted on Apr 01, 2017
richie46
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Main board is only board left. go go it.

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Had colored vertical lines on my Samsung LED TV. Have replaced the main board as well as power supply board. I now get a uniform blue screen with no other images. Any idea what the problem might be?

If you have replaced the main board and power supply board and are still getting a uniform blue screen on your Samsung LED TV, it could indicate one of the following issues:
  1. T-Con Board: The T-Con board, or Timing Control Board, is responsible for managing the flow of video data from the main board to the LCD panel. If the T-Con board is damaged or not functioning properly, it can result in a blue screen.
  2. Backlight Inverter: The backlight inverter is responsible for powering the backlight of the TV. If the backlight inverter is not working properly, it can result in a uniform blue screen.
  3. LCD Panel: The LCD panel could be damaged or have developed a problem, causing the uniform blue screen.
  4. Signal Cable: The cable connecting the main board to the T-Con board or the LCD panel could be damaged, causing a lack of signal and a blue screen.
It's best to consult with a professional repair technician or the manufacturer for further diagnosis and repair. They will be able to determine the exact cause of the issue and recommend the best course of action.
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1answer

I have a E60 Vizio TV that has vertical black and white lines on 1/2 the tv. I replaced the T-con board but that did not fix the problem.

The T-con board is for the led backlights!

Are the backlights working? Sounds like yes even before changing the T-con board!

Did you do the flashlight test into the screen to see if there is a faint picture? I guess if you did you didn't see a picture!

This would point to the main board or the cable from the main board to the screen!
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LG TV Model 55LE5500-UA. no sound no picture has power.

This problem is related to the mainboard and should be replaced. You can try to heat up the microprocessor with a heat gun though best solution is to replace mainboard. Part number is EBU60864321.

Hope this helps!
1helpful
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My TV is a LG 47LN5700-UH I had a lightning strike near the house. Afterward TV would start but not boot completely. Now it won't start at all. Cable box also got fried at the same time.

The led driver AND the T-con board are bad. If you could see a picture with the flashlight then the T-con board would be good. It is not. The led driver can be on the main board or the power supply board. You can get these parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy
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Lg tv blink codes

Take the screen off connect power and watch LEDs if any don't flash its LEDs only needed to change faulty strip if they all flash its probably t con boards.
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LED screen is black, but my tv still gets sound. LG told me this would be $331 for them to fix since the TV isn't under warranty. Could it be as simple a fix as the T-Con board?

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
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Lg 42" tv not displaying screen image

The t-con board controls the picture. To test it shine a flash light on the screen abd see if you can see an image when the TV is on. If you do then the T-con board is OK. Look at the back light ballast board (sometimes is part of the power supply board) If you see no movement or a dim picture with the flash light, then the T-con board is gone. You can get parts here: TV Parts Universal TV Stands DLP Chips ShopJimmy
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How to repair LG LCD TV 47LG70-UA no picture or sound

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
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TV powers on and and there is a backlight but no picture. The power supply board has been replaced but I haver no LG power up and drop down menus... Bad Control Board? My house was hit by lighteni

Hi, checking user manual there's no soft reset option so maybe the main board is faulty too, usually when there's a damage by lighting in power supply this also reaches the main board since they aren't electrically isolated.
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