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Hi Recently, I recieved iPhone 6 that has broken screen from my friend. It works normally and fuctioning ok when I restart the phone. But like 10 minutes later, the screen is shaking and touch screen seems doesn’t work. At first, I assumed that the touch ic chip was broken. But in my case, there is no grey bar on the top of the screen. What is the problem with my phone? Broken ic chip or just screen problem?

When you say the screen is shaking, I take it to mean that the image is shaking. If that’s the case, then I suspect a defective replacement screen. Touch Disease mainly affects the 6 Plus and the picture you included shows a jittery screen image.