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When we repair mobile phone motherboards or motherboards of other models

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There may be a PCB circuit defect

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For example, this motherboard on the screen we are seeing now

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As can be seen from the drawing, from the pin above the resistor to the pin above this resistor, they are connected

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But now when I use a multimeter to measure, I find that this pin is not connected to this pin

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This is a PCB circuit defect

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If there is a PCB circuit defect, it is impossible for us to dig out the main board and reconnect the lines inside it

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If you do it,basically the board is wasted

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So we can fix it by rewiring from another location

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Next, I will demonstrate how to reconnect a line outside

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First, we prepare a little medium melt solder

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Then use 0.01 or 0.02 mm enamelled wire

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Surface must be insulated

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Place the front part of the copper wire on the solder paste

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Tin the front part

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The tip is already tinned

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Now the tinned part is basically just enough to use

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If the length of tinned part is longer

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we can cut off the excess part

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This one doesn't need to cut off

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Just get a suitable length