Hi,

Just verifying that you had the battery disconnected when replacing the LCD screen and also when disconnecting and reconnecting the replacement LCD screen multiple times?

If you have a DMM (digital multimeter) use its Ohmmeter function to check that the display’s backlight fuse is still OK and not open circuit (blown). It should measure 0.00 (Zero) Ohms when the meter leads are connected, one to each end of the fuse. Do this with the battery disconnected from the device.

Here’s an image that shows the audio fuse (red arrow - F2001 - 1.0 Amp) and the backlight fuse (green arrow - F4101 - 0.5 Amp) The image was used before for another answer so the red box was only to show the value of the audio fuse.

(click on image to enlarge for better viewing)