I just replaced iPhone 5s complete display assembly, screen comes on but touch functions do not work at all!, can't even shutoff phone.
What could be the issue?
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I would strongly suggust check your connections to make sure you have a proper connection and to see if there is any obvious damage to the flex able. If one connection is loose, this can cause touch issues. You can also clean the connection with a toothbrush. If all this fails, I would try your old screen or another screen to see if it is a screen issue. If so, contact your representative about the issues you are having with the replacement screen.
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You can shut off the device by connecting the home button. Then, press the power button and home button until the device powers off. Just that easy.
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Check output voltage sage u3, if normally replace u15. If u3 heat replace u15
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@khairi post some images of the location of U3 and U15. That will help to explain your answer. The person that is asking the question may not know where those IC's are located. Use this guide to add pictures to your answers Adding images to an existing question
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