Hello!
i was going to replace the homebutton, so i switched off the phone, repaired it. then i started connecting screen and when i plugged one cable in, it started smoking. i was scared so i unpluged it. and plug again but this time with disconnected baterry. screen stopped working. idk if its problem of the phone or the lcd, its any way to fix this? (Phone actally truns on but without display, can check with the dnd button)
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you didnt disconnect the battery the first time so you have probably blown the backlight filter on the logic board, if you shine a light on the screen you will probably see the image but you won't have backlight until its repaired
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As Daniel says, you've killed the back-light filters on the motherboard. I don't know if you followed a guide but the first thing you must do on any device is disconnect the battery. Even if you try a new screen the chances are it still won't work. You'll need to find somewhere that does micro soldering to have the filters replaced.
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