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Most likely you broke one or both wire from the backlight to the circuit board. Open the unit up and look for a black and red wire. Both should be soldered to the circuit board. LED's are used for the backlight and so it does make a different that the back and red wire are soldered to the circuit board correctly.
You need to solder the wire or wires back on the board. There is a red wire and a black wire used to power the backlight. They go to two solder pads on the board that are near each other. You should be able to see where the wire has broken off. If you don't have the equipment or haven't done this before ask a friend.
When you opened up the unit, you probably loosened one of the wires. Look to see if there is a small, short black wire and a small short red wire attached to the screen and soldered onto the circut board. They control the back light and one of them may be loose or disconnected. It can be repaired if you have a fine enough soldering tool.
dont send your ique 3600 to raytech electr.i leaving at 5 min. from there and last week they tell me they dont repair the ique anymore they send back all there part to garmin they had to much problem with them good lock