Soldering new backlight IC and coil onto logic board

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iPhone 4

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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Aaron @aaron7824

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发帖于: 2012年8月31日

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Soldering new backlight IC and coil onto logic board

Screen does not work on iPhone. iPhone had some water damage. I've been testing continuity between pins and contacts and it has seemed pretty good so far. I have been using http://guide-images.ifixit.net/igi/GgDNm... as a guide of how to test the continuity. The LCD screen and digitizer are both not working. Would replacing the "backlight IC and coil" make them work, or is that only a step in the right direction? I'm lookin for a guide to replace them, if someone can please help.

Thanks a lot!

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Craig @irepairofpc 声誉积分: 3.6千 5 1 7 · Answer 1 · 2012-08-31T23:29:06-07:00

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Craig @irepairofpc

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You need a known good screen to test the backlight coil. If you can not see anything even in strong light then you have more than a backlight issue. I start with a good screen and then if I have a dim screen that can be made out in strong light. I would change the coil.

You need to resolver the pins on the LCD connector where they are burned black.The bottom pin on the LCD connector on the right side controls the backlight if it is burnt make sure to resolder it.

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I tested the logic board with a brand new screen, absolutely nothing. Then again, the connection bar looks quite a bit charred, but I've been tested the continuity. I have yet to pick up a solder kit, but I found a good 2 in one for 90 bucks. I'm looking for a good guide to replacing these, does it exist?

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iPhone 4

Soldering new backlight IC and coil onto logic board

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