Fault Description:
Large current occurred in the iPhone 7P motherboard
First Step:
Test it with the DC power supply ,then we get a 3.8 V value. We doubt there has a short circuit.
Following the repair process.
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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.
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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.
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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 cell phone repair knife so as to avoid unnecessary troubles.
11-2-4
After we finished the above step , we find a screen connected with this motherboard, we boot it and the screen shows normally, no unstable current produced. The repair result is success.
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