ONCE WE TURN TV ON, GOES DARK (DOING FLASHLIGHT TEST, WE CAN SEE IMAGE), AND THERE'S NO BACKLIGHTS. I BELIEVE THAT COULD BE A BACK LIGHT INVERTER PROBLEM. PLEASE CONFIRM.
Check LED Back light Driver circuit first. If LED Back light Driver circuit is not producing drive voltage, try to repair and if you haven't any experience of electronics repair, replace PSU board because LED Back light Driver circuit is built-in with PSU. If LED Back light Driver circuit is working, check LED Back light strips, one of the LED is faulty in the LED Back light strip. Replace LED Back light strip to solve your problem.
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/
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.
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