Repairing TV,sound works, see screen w/flashlight. However no backlights show,unsure what board I need to replace I have a LG 50LN5100. What is the actual board that needs replacement picture below.

The Knight

• 76851 Answers
• Posted on Feb 05, 2015

SOURCE: lg led tv backlight

Fault with its main 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://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Phillip Hicks

• 917 Answers
• Posted on Mar 14, 2015

SOURCE: How can I get my backlights to work on Samsung LCD tv

If your not a TV Engineer , get one to look at it , as you may keep changing the incorrect part.

The Knight

• 76851 Answers
• Posted on May 20, 2015

SOURCE: LG 50LN5700 TV. Why does it have a picture but no backlight?

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/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

The Knight

• 76851 Answers
• Posted on May 30, 2015

SOURCE: 47' (sic) LED TV, model number m470vse. Why doesn't the backlight work?

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/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions.

The Knight

• 76851 Answers
• Posted on Feb 29, 2016

SOURCE: why is my T.V. loosing backlight but not sound?

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://electro-medical.blogspot.com/
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.

Testimonial: "thanks for your response but as I stated in my description I have replaced the power supply board and the inverter board with no success. so basically you are confirming my question that the main board is the issue? the tv does not shut down the backlights when I use the VGA input only through the HDMI inputs. seems like for some reason when a program/movie changes to a different screen, a blackout frame, the backlights turn off and don't recover."