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In this video we deal with a malfunction that occurred after replacing faulty lighting with new LED strips, and the symptom is dark zones. The main suspect is the BD9397EFV, which in many TVs when replacing LED strips with new ones is known to cause problems or is simply damaged when the LED diodes on the sticks fail and very often leads to trouble in repairs. This is a specific malfunction and a situation that borders on the possible, which can drive a person crazy, but with persistence and a lot of effort we solved this mystery. The TV model is Samsung UE32j5000AW.