Which suddenly lost the picture (black screen) from all sources, but had the sound. I do not see led lights working, but I can see the picture with direct flashlight. Multi-tester beeps on each of the leds. What seems to be the problem?
Sounds like 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.
Testimonial: "Dear Knight, many thanks for your time and help, I truly appreciate it. Just to add some details... When I used multi-tester, I could only get one of the first leds from each chain (5 in total) to light. When I switched the tester mode to beeping sound, I had it beeped on each leds (45 in total). Is there something that preventing the rest of the leds to light on or this beeping does not confirm that the leds are working? (Changing polarity did not affect the results.) Thank you in advance."
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