DVLED Display with an unlit LED Module.
Answer: Ensure the affected LED Module is in the correct orientation.
Solution
The LED Module will need to be removed with the Vacuum Suction Tool in order to be flipped to the correct orientation
Related links
"Why is an LED Module showing a colored straight line on my DVLED?"
"Why is an entire column of LED Modules not on even though my DVLED Display is powered on?"