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lcd screen wont power after repair

So here is my question. I purchased a replacement lcd/digitizer off ebay to fix my damaged lcd screen. Prior to the repair, I damaged the internal lcd of my phone to where about 3/4th of the screen was cracked and damaged. However, I could see the top 25% as a quadrant in the top right corner of the screen. Not very usable, but it worked.

Today a replacement screen and digitizer arrived and I went ahead and did the replacement. On powerup I hear the startup chime, and nothing else while the screen is black. The new digitizer functions through the new lcd as is made know by the unlock and other sounds from touching the screen. MY issue is this lcd not powering on. Ive resat the cable, ect and it will not light up. Any ideas what to do? Ive bit the bullet and bought a new phone that is on route to me, but I would like to know if there is anything I can do here as I now have a screenless phone and what appears to be a dead lcd that the buyer wont accept back.

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sometimes the lcd from ebay might be defective. I have had some of them myself.

You might want to test the ebay lcd out on another phone.

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check if the screen is connected propperly (even experts sometime make mistakes) then try to shine a light on it and try to see if its the backlight thats broken... also, if you paid via paypall you can still get your money back and ebay also has something like that, try to contact them

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Here is an update.

I purchased 2 more lcd screens and I still cannot get the screens to power up. Like the previous one, they do pass the digitizer signal through the lcd to the motherboard, but the screen has no image at all.

I did a further teardown of the phone and pulled the motherboard to check for any damage and could not find anything. Is there some sort of hardware lock that has been triggered? Like I said in the post above, the phone was working fine with only the installed lcd having its screen damaged. Please someone let me know if they have any idea.

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Try it with you old screen to set if it's the phone or the new lcd

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