crwdns2934241:0crwdne2934241:0 Jennychan

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Here are the possible reasons below:

1. Power Distribution Issue

2. The Dead Battery Issue

3. The Damage Board Issue

4. Assembly Issue

5. Problem with Flat Cable Connection

You can check more details here:  [http://www.hcqs.us/blog/iphone-wont-turn-on-after-screen-replacement/|Why iPhone Won't Turn On After Screen Replacement]

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open