It’s definitely caused by one or two resistors/inductors being knocked off during screen replacement, as seen in this picture https://imgur.com/SZ620sF
You have to use a fine soldering tip to form a small glob of solder across the knocked off resistor/inductor pads. It's best to use low heat so that the solder doesn't flow too easily in order to create a bridge across the pads on the circuit board. Care must be taken, because the molten solder glob can easily short out nearby pads, creating an even bigger issue. It's not an easy task especially without using a microscope, so those who don't have the right tools and/or skills, are probably better of taking it to a local phone repair shop and let them bridge the pads for a few bucks. At least now you know exactly what to ask them to do in order to fix your phone. ;)
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