Here to get a best solution to fix iPhone 7 Plus PCB board short circuit and no service issues. The iPhone 7 Plus was accidentally got some water, then some problems comes out. After checking, it shows large current. The details as follows.
First of all, observe the iPhone motherboard under the VGA Camera 7-45X Trinocular Stereo Microscope, it is slightly water damaged, large current when connecting on DC power supply, 3.8V short circuited. Because it is slightly water damaged, firstly check the specific damaged area, and find that the capacitance is corroded, which is the capacitance on the 3.8V circuit.
Pick
up the fault and solve it, then clean it in the water inlet, gently fix the
trouble and test the whole function after screen installation, now all other
functions are normal, but there is no service on the iPhone 7 Plus.
Observe
the radio frequency section under the Trinocular Stereo
Microscope , we find the reception of the front end is corroded.
The
fifth trace supply power for RF 1.8V, there is a serious corrosion and the
layer is burned, scraping the bottom circuit to solder jumper
wire.
It
should be noted that this line is the same as a three branch road. If we want
to connect the two sides to the bottom and scrape the bottom, if we are not
familiar with the circuit, we suggest to scrape up the circuit and check it,
then scrape the trouble layer, it's better to carefully do the operation with
specialized CPU Remove Graver so as to avoid
unnecessary troubles.
Finally, assemble the iPhone and test it again, now the iPhone is working, it has service. Continue to check other functions, all is fine. The repairs end!
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