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It sounds like something has shorted on the board. Did you disconnect and remove the battery? Not doing so means there is still power going through the board (even if the phone is powered off)
Only other thing I can think of is a static discharge has damaged the screen connectors
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the phone display but the screen light is on and off
back light fuse is gone . It`s more common than you would think when you preform repair on the phone without disconnecting battery. Solution is to find some one who could replace that fuse.
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Did you turn off the phone and unplug the battery before plugging in the screen? I really don't know why some people in repair shops don't do that.
由 Ben 完成的