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This lesson is about the maintenance of camera failure of not turning on

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The first step is to remove the mainboard and visually inspect the camera connector

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and its surroundings for water corrosion

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If the connector is severely corroded, it must be replaced.

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Surrounding small components such as resistors and capacitors, if corroded, need to be replaced

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If there is no water ingress and corrosion, it is necessary to proceed to the next step

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Take Xiaomi 11 as an example

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Find the camera connector

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This is the connector for the rear camera

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This is also the connector for the rear camera, this is also the connector for the rear camera

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This is the connector for the front camera

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We determine the positions of these connection sockets in the bitmap

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If the rear camera cannot be opened, it depends on these three connectors

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If the front camera cannot be opened, it depends on this connector

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First visually inspect its appearance for water corrosion

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If the connector is severely corroded, it needs to be replaced.

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This is a malfunction of the connector

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These small components around the connector belong to the camera circuit

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If these small components have serious corrosion,

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you need to see if they are related components of the camera circuit

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If yes, it is possible that the corrosion of these components caused the short circuit

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Severe resistance corrosion generally leads to open circuits

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The above is the first step

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The second step, when the appearance of the connector is normal,

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and there is no water corrosion around the connector

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At this time, it is necessary to find the camera connector and measure the ground value of the bus

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The camera bus is the CSI bus

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You can directly find the position of the connector to measure by checking the circuit diagram

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When measuring, if OL appears,

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it is necessary to measure the pin on the end of the component connected to the CPU

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Because there are usually serial components in the line from the CSI bus to the CPU from the connector

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Take Xiaomi 11 as an example, open its schematic diagram

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Let's take a look at the CSI bus

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Double-click it, we can see that there are no components in the line leading to the CPU,

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it is directly leading to the CPU

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If infinity appears, you need to resolder the CPU

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If there are components in series,

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you need to measure the ground value on the component pin leading to the CPU

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If the ground value is normal, it is necessary to short the inductance or row inductance

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If it measures infinity or 0, you need to resolder the CPU

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That's all for this lesson