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第四代iPhone。维修过程直观易懂，但前置玻璃和LCD面板无法分开，只能作为同一零件更换。GSM版本， 8, 16, or 32 GB 容量 / 型号 A1332 / 黑色或白色

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iPhone 4 Screen is unresponsive after replacement

I recently replaced my touchscreen on my iPhone 4 following the guide on here since it was dropped and the glass was cracked. After it's been replaced the LCD works but the touch sensor doesn't work. Is there any reason for this to happen?

When I tried putting back the old screen the screen worked sporadically. I was only able to swipe the lock screen a few times however this was not the case before i opened it. I had a problem with a screw missing but i dont think that should be the problem. I even reassembled at least 3-4 times to make sure the ribbon cables were all intact. This is an iPhone 4 Verizon version.

Thanks

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if its torn can it be repalced?.

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If either or both LCD Display or Digitizer Flex cables are damaged or torn. The fix if to replace the entire Front Assembly LCD Display and Digitizer. The damaged flex cables themselves are not replaced.

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I just tried to replace a black LCD with a white one on a VZW iPhone 4, and I accidentally ripped the cable on the white display, rendering it useless. Then when putting the black LCD back in, I bent the flex cable under the frame accidentally, and now the digitizer works sporadically, and not in all areas of the screen.

The LCD is one of the trickiest repairs to do on this, because even after you've painstakingly removed ALL of those screws, you can still damage the LCD while installing it. At least now I know for the future!

Just make sure when you're installing a new screen that once you're actually putting the LCD on, you're lightly pulling the cables through the frame the entire time, so that they don't get stuck under it and become bent.

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The ribbon cables for the LCD and touch screen can be bent or torn easily, so the cables could be damaged and you couldn't tell. I would try another LCD and be very careful not to bend or tear the cables.

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im waiting on another replacement. I think i am going to test it without reinserting it fully to make sure it works.

And just curious how should they be bent? Because when i put the cables through the front cover they have to be bent a little to attach to the logic board.

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On the screens I've replaced there was a dotted line. But it should be okay to bend them around the area the should bent. Just make sure there not torn.

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If this answers your question make sure you accept it so people know it has been solved. how to accept an answer

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Mine did the exact same thing. I am worried that the problem was in reconnecting the cables that I might have damaged the actual connector or the cable as I had initially accidentally had part of one of the display cables folded under the logic board. Also, the screen warps with pressure around the edges. The screen is completely unresponsive only on one side.

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Hey guys,

I just got an iPhone 4S with a completely irresponsive digitizer in. I replaced the screen with no result. Tested multiple screens with a testing cable and without the testing cable without any result. If I look at the screen connectors on the logic board I see no damage to the connectors with a loupe (8x) nor did the screen start to work after cleaning with isopropyl alcohol. Any thoughts what could be the problem. Tried a software restore and reset already.

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Boomvalk does all the screens work in another phone? It's possible the touch chip on the motherboard have went faulty

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Yes I tested the screens b4 and they should be fine. Can I temporarily fix it like the audio-IC chip by putting some pressure on the chip And put the protection sheet back on? Do you know where the chip is located in a 4S?

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