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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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Why is the new display I installed have no backlight?

I had ordered a new display for my iPhone 6s (A1633) that includes the ear piece and front camera assembly.

After I received the package and finally got to installing the new part, I needed to do some testing. Apparently, there is no backlight. Everything else though works that I could test. Screen touch works, responds well as far as I could test it. One of my tests resulted in a momentary bright light in boot/charge-from-flat screen. Then there was no more backlight at all.

Plus, I could not test my old display since it was already in seriously bad enough condition.

Why could this be? What could this be?

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First thing to do is see if we can verify whether it's a display (LCD) issue or a backlight issue. In a darkened room, hold a flashlight up against the screen, try different angles of both the light and viewing to see if you can make out an image. If you can then it's almost certainly a backlight issue, otherwise it's the whole display.

The most common issue we see with LCD screens that don't work on installation is due to a blown backlight circuit. That usually occurs when the display is being connected or disconnected while the battery is still plugged in. There are pins that are very close together that can short out and destroy the backlight circuits if there's power present when the connectors are misaligned and put in contact. That's why it's so important to disconnect the battery first when disassembling and connected last when reassembling.

Usually it's the backlight on the display that gets blown, but occasionally parts on the motherboard get fried. If you verify that it's a backlight problem, I'd suggest trying another screen; the price for iPhone 6 screens is dirt cheap nowadays so that's what I'd do.

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That is exactly it then. Blown Backlight Circuit (BBC) (tee, hee). I guess I'll check-out another one then. Thank you.

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@dominickrogers I know you said your old screen was in pretty bad shape, but if it lights up at all that would tell you it's the new screen and not the motherboard that's the problem here. Just don't forget the battery, disconnect it first thing and reconnect it last.

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@dadibrokeit Hello, and thank you for your reply and understanding. Though, as I did say previously, (not to be annoying or what not)

"Plus, I could not test my old display since it was already in seriously bad enough condition."

Including that the previous screen also had the ribbon cable torn completely off and *SILLY ME* reading the sentance about the Home Button. Thought that I should take the screen apart if I have to to get the home button cable. What a wacky-wonky way to have any ribbon cable. The entirety of the back of the screen and basically, seemingly "All About Route". If you will. So, yeah. Could not do that unless I hadn't of done that in the first place. Unfortunatly.

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Dominick Rogers will be eternally grateful.
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