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Repair information and guides for the Apple iPhone 5c that was announced on September 10, 2013. Model: A1532, A1456

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After a fall, the phone only works with the broken part (LCD)

Hi guys, it's the second time that happens this strange thing when i work with fallen iPhone 5C. The phone only works with the broken part (lcd with vertical stripes, touch unresponsive etc.) when i try with a new screen, it never turns on, just the backlight when i try to replace it after i have turn it on with the broken screen and replaced with new with the phone turned on.

it's possible that after the fall, the motherboard and the screen will break in a complementary way?

which component should I check?

Thanks

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You most likely got a faulty replacement LCD.

LCD only showing black light display with no image display usually means a bad connection between the LCD display and the LCD connector on the logic board.

Might want to check for any dust or lint on the LCD ribbon cable from the new screen and any signs of damage on the cables.

Edit: And yeah always disconnect battery first before unplugging or plugging in any cables.

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DISCONNECT THE BATTERY.

Remove the LCD and digitizer connections and clean both sides with 99% IPA. Reconnect the cables and then the battery. Before you turn it on, plug it into power and see if it boots itself up. If it doesn't, then its more than likely a bad screen. It sucks, but bad screens are very common.

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I tried to clean the connections with isopropyl alcohol, with no improvement. I even tried a second new screen.

So I tried the screen of another phone that had an audio problem (so the screen is operating at 100%), but still no results.

Only when i plug back the broken screen i see the logo and stuffs with stripes and strange contours of the icons.

:(

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grey bar at the top of the screen?

The only part on the motherboard that I know of that could cause this would be the Touch IC. The 5C isn't know for that issue though. Its actually a pretty rugged iPhone.

The troubleshooting should go: screen > connectors > flex cable > connectors > board level. There just isn't a whole lot that could be causing this.

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