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High current occurs when iPhone starts up

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In this video we are going to focus on the repair process

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Step 2 of the maintenance process

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If there is a thermal imager,

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we can use the thermal imager to determine short-circuited or damaged components

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The mainboard is energized, the switch is triggered,

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and we put the mainboard under the thermal imager

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If a component breaks,

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the temperature rises and the thermal imager shows it

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If there are damaged components,

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we will remove or replace them directly

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So let me demonstrate

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The mainboard is energized, and then trigger the switch

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When the mainboard has a high current, the damaged components will be hot

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At this point we can look at the thermal imager

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If a component is damaged, its temperature will rise sharply

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This is a capacitor, we can see that the capacitor is damaged

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If the power supply chip is obviously hot,

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we don't have to deal with it

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Because the power supply chip is used to convert the power supply to the rear pole,

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after the rear pole line short circuit, the power supply will be hot firstly

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After removing the damaged component,

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we trigger the switch

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As we can see, the current jump is back to normal

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Precautions for using thermal imager

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When we're repairing the machine,

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if it is a large current immediately after the boot, and then return to 0,

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this belongs to the power supply protection

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In this case, we can not find the damaged component with the thermal imager

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Note 2

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When we observe the mainboard under the thermal imager,

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if only the main power supply is hot

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We can ignore it and wen don't remove the power chip

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The fault may be caused by a short circuit in the rear power supply of the power output

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We can follow the following maintenance process to operate

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So that's all for this lesson