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Repair information and guides for the iPhone 6S released by Apple on September 25, 2015. Models: A1688, A1633

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Brand New Screen not working, but the home button works...

So I got a brand new screen for an iPhone 6s with a cracked screen, which turned on and worked before replacement, it was just cracked. However, after installing the new screen, it won't turn on, but I know the phone is on because I can hear the plug/unplug noises, and the switch for silent makes the phone vibrate. I also know that the home button works because the hard reset combination(hold Home key and On/Off Key) causes the plugin noise to be made after a few seconds, during which I'm assuming it reboots. But despite all my troubleshooting and googling, I have no idea why the screen won't work. Any Ideas?

*Note* The screen replacement was the full LCD assembly, to avoid any weird issues. All I did was unscrew the panel where the LCD assembly plugs in, switch assemblies, then screw everything back in.

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Plenty of factors in tampering can cause this issue, and the most frequent are listed below.

remember to remove a battery before any repair.

remember to do A HARD RESET after every replacement. (Home button, and power button for 20 seconds, or until you see the apple logo.)

Always try a second replacement part. It is always possible the screen you got in is bad.

1) The Connections to the screen are loose: open up the device, re-remove the screen, and attach it again. make sure you hear a click with each connector you apply. Should you have access to it, i would also suggest cleaning the connections with 99% isopropyl for a longer lasting device.

2) The Flex Ribbon has been damaged: accidents can still happen. In this case, replacing the screen should fix the issue.

3) Image Processing IC: Low quality screens, lack of Antistatic protection, and use of metal tools can cause static discharge which damage the GPU. A much more advanced repair, replacing this IC should fix the issue.

4) Missing/damaged components in the related circuit: There are hundreds of components on a board. using the wrong tool in the wrong spot, slipping with the drivers or even a drop, can cause failures on the Screen. Manually scan the board for damaged or missing components in the areas you have worked, and replace as necessary. (A microscope is very helpful attempting this)

4) Motherboard damage: If ALL else fail, you have a perminant failure in the PLB, and need to replace it.

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2 Comments:

I tried basically everything you suggested except IC replacement and Motherboard replacement. No other common issues to speak of? All the advanced options, such as a Motherboard gone bad and a damaged component in one of the circuits, would require more expertise than I have and would warrant replacing the whole phone.

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well your OP says you didnt remove the battery. This is the number one cause of failed repairs. if you have read my notes in entirety, and have replicated the procedures. then you have likely fried out something on the motherboard.

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