Pin #2 pulled out and moved to slot #4 ground. The YT video provides the explanation. This was our setup not exactly as the video. From this YT solution as a reference https://youtu.be/T3VRvQUB_DQ?si=jXIjIRpj... we temporarily fix the 4 flashing red light for sony KDL-70W840B. We'll just wait until the TV gives out. For now it works. followed the BL_ERR as per yt video, our tv is a different model. Thought to share this temporary fix for this particular sony model. Hope this helps.