TV Repair Questions? Ask a TV Technician for Answers ASAP
I am sorry you are having trouble here, could you let me know the approx age of the set please?
Problem is the back-lights ,these are the LED strips just behind the display unfortunately we are in an epidemic of failure of these devices across makes and models, thing is its a very laborious and costly job to replace these, so we only do sets that are under 3 years old and over $1200 because it could cost $300_$400 to replace them, its a complete strip down of the set 4 hours labor.
Sorry its nothing easier here, you have done the correct thing by replacing back-light supply
You are welcome