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When repairing the motherboard of the mobile phone

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Occasionally, some small components are loosened during the welding of the mobile phone motherboard due to manual reasons

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For example, the area around the plastic connector we see now

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Some small solder beads appear on the surface of some components

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At this time, the components wrapped in black adhesive may have become loose

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Meanwhile, we can check the drawings to determine whether they are resistors, capacitors or inductors for maintenance

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If the capacitor is smaller in size

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We can see what it does on the drawing

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If it is a filter capacitor

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One end is connected to the signal or to the power supply

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The other end is grounded

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We can directly use tweezers to break this small capacitor off

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If this component is an insurance resistor or an insurance inductor

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Once it's loose we need to connect the loosen pad

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Remove this component first

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After removing it, we need to connect the corresponding two solder joints

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Let's say that the one we broke off is an insurance inductor

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Then let's see how to connect it

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Let's learn the first method

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Connect with solder

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At this time, we need to use a medium melt solder of 183 degrees

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Then completely cover the two pins of the components we need to connect with solder

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Meanwhile, it is best not to connect to the surrounding components

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Still using a straight-air hot gun

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Adjust the temperature to around 300-350 degrees

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The air volume is still the largest

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Then we blow this solder

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If it sticks to one side, we can use tweezers to gently push it to the other side

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Let it wrap both solder joints at the same time and then we reheat

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This is one of the methods to replace the damaged insurance component