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Phone dead after replacing screen > didn't disconnect battery?

I replaced my IPhone 7 plus screen and it worked.

However the touch button wasn’t seated properly so I reopened and re-seated.

Now, I remember when reading on the screen replacement manual that came with it “make sure to disconnect battery before working or guaranteed failure” to that effect.

But because I was in a rush this time i dont think i disconnected the battery prior to removing the screen.

Now the phone is completely lifeless.

Im wondering if the phone has a fuse, or what would be the most likely cause of a dead phone after replacing screen without disconnecting battery properly?

Im hugely distraught from this since it was clearly working before i re-opened to fix home button..

Any help appreciated

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You might have shorted something in your haste. I’m sorry for your loss

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It’s very important to always disconnect the battery before disconnecting/reconnecting the screen assembly. The issue is that the LCD connector has pins that have high voltages (i.e. the backlight is ~20V) and ground in very close proximity. When you fumble around trying to line up the connector plug to the receptacle, you can short out the voltage rail and cause damage to the components in the backlight circuit. If you’re lucky, then only a backlight filter is damaged but other times, the entire circuit could be affected. Either way, this type of repair requires micro-soldering and isn’t really a DIY repair.

To test for this, plug your device into a charger or an iTunes enabled computer. Then shine a bright flashlight on the screen. If you can see a dim image, then the backlight circuit has been damaged. If you can’t see an image at all, then it may be the LCD circuit that is damaged.

If iTunes doesn’t recognized the device than the problem is more than just a screen or backlight issue.

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Thank you Minho, using a flashlight i saw nothing on the screen. Is there any chance any circuitry on the main board could be damaged? or is it most likely just the LCD screen assembly? thanks for the useful answer

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If the phone didn't suffer any physical damage prior to or during the repair, then odds are it's a logic board issue. The only way to know for certain is to try a new or preferably a known-good screen.

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what does it mean if the phone won't boot up completely and just keeps cycling the apple boot up logo?

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It’s probably an issue with the battery@Joshua Gordon

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I had the same problem with my iPhone 7. I tried shining a light but nothing. Tried a new screen and again nothing. If it is a logic board repair can I buy one of eBay. I have a universal home button but I was wondering whether I can swap in any iPhone 7 logic board and it will work?

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@refectio Hi,

I have the same issue. no dim light at all but the phone is working fine. I think LCD circuit damaged. how do I repair it? its a iphone 6s.

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It is probably the connector for the display on the logic board. You would need someone to resolder a new connector but try a new screen first

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