I replaced the main board, power supply board & T-Con board with no results. Performed the flashlight screen test & I can see some letters when hitting the settings button on the remote. Any help diagnosing the issue would be appreciated. try changing input or source
1. Disconnect the cable between the main power supply & main board, supply AC to the TV, if the LED strips are OK, it should light UP, if not replaced all of the LED strips.
2. If the back lights light up, but no display or sound, replaced the main board.(after you re-connect cable).
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.
SOURCE: How do I fix my Samsung 40 LED TV that has sound but no picture?
Samsung 60-Inch 1080p 120Hz Slim Smart LED HDTV ...
? 10:42
www.youtube.com/watch?v=hcVhHU322Gk
May 18, 2015 - Uploaded by Thomas M. Landry
samsung un60h6350 60-inch 1080p 120hz smart led tv,samsung... 120hz smart hdtv,slim led tv,65 inch smart tv deals,samsung 40 led 1080p 120hz ... LCD & LED TV Repair - No Image & Blank Black Screen Flashlight Test ...
SOURCE: On my Hisense 50K23DG LED TV, I have sound but no picture.
Hi,
Hisense TV's usually use PCB Boards by Vestel and not Hisense themselves, have a look at: Vestel Help If the Boards in your Hisense match this Board/Part Number format at least you'll know what to search for, replacing the power supply will not help unless the process has been incorporated into the power supply and that is not known for certain yet
Good Hunting
SOURCE: vizio 55 inch led sound but no picture
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://electro-medical.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.
You have wasted enough money guessing bite the bullet and replace the TV. I have done this same thing and regret it to this day, should have just junked it.
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