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Step 2 of short sircuit repairing for iPhone standby circuit

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If there is a thermal imager, we use it to determine

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the positions of hot and damaged components

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Here is the operations method

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After the mainboard is powered on,

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put the mainboard under the thermal imager

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If there is a short circuit, the temperature of the short-circuit position will rise,

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indicating that there is damage to the component there

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It should be noted that if the hot component is

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a charging tube, a charging chip, or a boost chip,

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we don't need to deal with it,

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because it may be caused by the short circuit of the rear stage

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Next, let me demonstrate

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How to use the thermal imager,

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we first connect the thermal imager to the computer

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set the parameters,

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and connect the mainboard to the adjustable power supply

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When the adjustable power supply shows the current,

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we observe the temperature change of the mainboard,

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and the position where the temperature rises indicates

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that the component in that position is damaged

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We observed the thermal imaging and found that

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there is a component above the hard disk that heats up,

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and the temperature rises to 135 degrees and continues to rise,

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indicating that the component has been damaged

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We need to replace it according to the soldering skills we have learned