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

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If there is no abnormality in the ground value measured in the above three steps,

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it is necessary to carry out the fourth step

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Turn on the mobile phone and measure the 1.8V power supply of the camera

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If the ground value is normal, but the voltage cannot be measured,

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it is necessary to replace the camera power supply or LDO module, or the power chip

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If the ground value is infinite or short-circuited on the base,

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it is generally necessary to replace the camera power supply or LDO module

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If the voltage of this road is normal, you need to proceed to the next step

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The fifth step is to measure the voltage of the I2C bus

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The I2C bus has a pull-up circuit, we need to measure it in the power-on state

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If the voltage of 1.8 volts cannot be measured,

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it is necessary to measure whether there is voltage at the power supply end of the pull-up resistor

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If there is voltage on the power supply but no voltage on the signal,

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the pull-up resistor needs to be replaced

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If there is no voltage at the power supply terminal, you need to check which chip the power supply comes from

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Resolder or replace the chip

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If the voltage of the I2C bus is not abnormal, you need to go to the sixth step

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Turn on the camera on the phone, keep the camera on,

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and measure the 1.2V and 2.8V power supplies

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If the voltage cannot be measured, replace the chip that outputs this power supply

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Here everyone should pay attention, before measuring the voltage, the mobile phone must be turned on

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Only in the power-on state can you measure whether the power supply has output

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Measuring these two power supplies requires a special condition,

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enter the system on the mobile phone, click the camera function

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After clicking the camera function, the power supply will output voltage

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If the camera function is not clicked, even if the power supply line is normal, it cannot output voltage

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This is the point to pay attention to when measuring power supply

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That's all for this lesson