IPhone 4S screen replacment problem?

So I replaced an iPhone 4S screen for a friend and a day after I returned the phone, the screen started flickering on the bottem and the phone doesn't get service after this problem. Any idea what it is? Please LET ME KNOW!

You have the screen replaced by someone that was not Apple. I doubt they are Apple certified either.

In my experience this could be a bad connection on the Screen cable or you've damaged the LCD screen this is usually done due to wrong screw in wrong hole, it really does not take much to damage these LCD screens.
I had this same problem with my iPhone after putting a new screen on. But in my case, it was the manufactures fault. The screen would show up in a pale green color and lost connectivity instantly. Ask for a new one or your money back.

Not sure about the service piece. Hope nothing is fried, but there's a digitizer that must be calibrated with screen replacement or it will do haywire things on it's own or not be responsive to your touch.
See this. Might need to break down again and make sure you got it right.
Best luck.

A few things. I'm a cell phone repair tech. One thing I would ask is where did you get the screen? If you purchased it from an unreliable seller on ebay then you may have purchased a defective screen. If the LCD flex cable is cheap, then the shield pressure can bother it. The most typical reason for Low signal are the following.

- Cables not properly seated.
- Gold Hardware not installed in the correct spot.
- Screw in wrong holes.

If you get stuck in a bad spot, you can visit my website listed below. I can provide a coupon code. To keep this repair in your budget.

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