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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone 4 / iPhone 4S

iPhone 4 / iPhone 4S iPhone 4 / 4S

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Old 08-07-2016, 00:28   #1 (permalink)
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iPhone 4s No display


I have a iPhone 4s which was initially having issues in iTunes while 'Restoring software'. It was giving ITunes error 21. There was not display when I had received this iPhone to begin with.

I have now managed to do the firmware update successfully.

But the issue is:

1. No display. When I switch it ON, the apple logo appears for like 1 second and then screen is black.

2. I have tried with other screens but same.

Please advise which IC's I need to replace or reflow to get the screen working?

Many Thanks,


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Old 08-16-2016, 18:14   #2 (permalink)
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not tested, but try this change
backlight ic coil for iphone 4s
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Old 08-18-2016, 06:34   #3 (permalink)
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Same issue but not solve . Can any help us ?
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Old 08-22-2016, 15:24   #4 (permalink)
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You can not reflow ic's on an iPhone 4s, since they are all glued and will give a short when heated. Check for shorted caps
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Old 08-24-2016, 19:07   #5 (permalink)
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Cheak light coil and light ic
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