Backlight works but when I turn it on nothing spears on the screen /: no Nintendo bar ... Does anyone know the reason for this??
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Indiana
Did you remember to reconnect the ribbon cable that joins the front and back PCB? Was that cable damaged in some way?
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Austin, Texas
…Do you have the contrast turned all the way down?
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I think the ribbon cable underneath the LCD lost connection or something... best to look for another dmg now 
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Austin, Texas
It's still worth checking again, there might be something obviously disconnected…
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When I pressed the ribbon cable underneath the LCD the screen started to show the loaded up game that was inserted (which was Tetris) stayed on the screen for about 3 seconds til it went blank again so I pressed on the ribbon cable but the screen didnt show like it did previously just stayed blank
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but everything else like I said before the sound, the backlight still works properly
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Austin, Texas
You might have stressed the ribbon cable too much. Maybe you could try the vertical lines reflow trick and see if that works?
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Seattle, WA
I've been having this same problem today. I was having D-pad issues, fixed that but my positive backlight lead came unsoldered in the process, fixed that, and now i just have a blank screen. I'm pretty sure I've stressed the ribbon cable too much as well from having to keep disassembling and testing.
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The ribbon cables are very robust. I'm sure it's shorting out, try and cover up where you soldered the backlight wires to. could you maybe provide me a picture of the internals?
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Germany, Trier
look for the solderjoints underneath the screen. in most cases when removing the refclecting layer from behind the screen, it gets loose on min. 2 Pins. I had the same issue and just resoldered 2 pins.