Why Iphone 6 Won't Turn On motherbarod screw missing
When you IPhone 6 shows nothing after being turned on and the screws on the motherboard are gone. what can we do to find a solution here.
After teardown this iPhone, we find that someone has twisted off screw BS2503. The real location of screw BS2503 is shown in picture 3-50.
Picture 3-50
Observing under a microscope, the screw is shown in picture3-51.
Picture 3-51
Getting a useless motherboard, scrape the PCB under the screw off slowly under a microscope. We can see there is a line under it, as shown in picture 3-52.
Picture 3-52
Comparing it to a brand new motherboard and checking the bitmap schematic diagram, we know this line is the power supply circuit used between main power chip and PP1V8_LCM_CONN of LCD socket, as shown in picture 3-53.
Picture 3-53
Solder the broken circuit with a copper wire and connect display screen(VC484) to test. Now iPhone can display normally. Paint some UV Solder Resist to make it insulated and use a UV glue Curing LED Lamp to solidify green UV Solder Resist, as shown in picture 3-54.
Picture 3-54
After teardown this iPhone, we find that someone has twisted off screw BS2503. The real location of screw BS2503 is shown in picture 3-50.
Picture 3-50
Observing under a microscope, the screw is shown in picture3-51.
Picture 3-51
Getting a useless motherboard, scrape the PCB under the screw off slowly under a microscope. We can see there is a line under it, as shown in picture 3-52.
Picture 3-52
Comparing it to a brand new motherboard and checking the bitmap schematic diagram, we know this line is the power supply circuit used between main power chip and PP1V8_LCM_CONN of LCD socket, as shown in picture 3-53.
Picture 3-53
Solder the broken circuit with a copper wire and connect display screen(VC484) to test. Now iPhone can display normally. Paint some UV Solder Resist to make it insulated and use a UV glue Curing LED Lamp to solidify green UV Solder Resist, as shown in picture 3-54.
Picture 3-54
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