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Short sircuit repairing for iPhone standby circuit

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There are many steps in the repair process

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In actual maintenance, not every step is required

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It may only need the first step,

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or it may only need the first three steps to solve the problem

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When repairing, don't skip steps to repair,

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we have to repair step by step in the order of easy to difficult

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Simple problems will be dealt with first,

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and more difficult steps will be put at the end

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Step 1, Appearance inspection

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When inspecting the appearance, we need to check carefully

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from the front and back of the mainboard, from top to bottom,

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and don't miss any position

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If we find that the mainboard is obviously damaged

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by water ingress and corrosion, we will deal with it first

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Next, let me demonstrate

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Appearance inspection is very important in our actual maintenance

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We have to be very careful when we observe

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Like this water intake, we should clean it

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Like this position, the mainboard is corroded,

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and the capacitor has been oxidized

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Appearance faults that we can clearly see should be dealt with first

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This capacitor is severely corroded, the chip has to be removed and reballed

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Like this, the board is more seriously corroded by water

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According to the welding knowledge we have learned,

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the corroded components should be replaced,

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and the corroded chips need to be reballed

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Some components will have obvious burn marks or cracks

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for example, like this capacitor

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It can be clearly seen under the microscope that it has cracks

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Components that are visibly damaged will need to be removed or replaced

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Some mainboards have stickers on them

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Like this sticker, we can take it off and look at it

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We found that it is clean,

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there is basically no problem under the sticker

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After we've looked at the back, let's look at the front

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There are some shielding covers on the front,

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we don't need to remove them now

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If there is no problem detected in the other places during maintenance,

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we will remove the shielding covers