I have tested LED strips and all light up. I test them with led tested an both line test out at 100v and all come on. When plugged into the power board I am getting 180 to the 1st + and 90 to the 2nd but still will not light up. I have changed out both the power board and the main board. I get flashing standby light and see image with flashlight test, yet still mo backlights

here you