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iPhone camera circuit repairing

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This video mainly explains how to find the iPhone 12 ProMax front camera signal and measurement points

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Search method step 1, open the component map of iPhone 12 ProMax,

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Step 2, search for the position number in the schematic diagram

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Step 3, after finding the camera connector,

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find the corresponding signals according to the schematic diagram

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Step 4, jump to the bitmap according to the name, and find the connected components

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We can measure the voltage and diode value at the yellow points in the bitmap

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When checking the maps, first open the iPhone 12 ProMax component map, circuit diagram, and bitmap

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Find the position number of the front camera connector in the component map

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Then search for the position number in the schematic diagram

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After finding the connector, find the corresponding signals according to the block diagram

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Let's first find the 1.8V power supply from the camera power supply to the front camera

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Pin 14 is the 1.8V power supply of the front camera

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Jump to the bitmap according to the name,

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the 1.8V power supply is connected to the camera power supply U5300

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after passing through the fuse inductor FL10700

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Next, find the I2C detection bus from the camera power supply to the front camera

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The 6th and 12th pins of the connector are the I2C buses

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Pin 6, jump to the bitmap according to the name,

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the pin is directly connected to the camera power supply

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Pin 12 I2C bus, jump to the bitmap according to the name,

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the pin is also directly connected to the camera power supply

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Next, look for the 12M clock signal from the camera power supply to the front camera

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Pin 4 of the connector is the 12M clock signal for the front camera

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Jump to the bitmap according to the name,

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the clock signal is connected to the resistor R10710,

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and directly connected to the camera power supply after passing through the resistor

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Let's find the 2.85V and 1.1V power supplies from the camera power supply to the front camera

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Pins 18 and 2 of the connector are the 1.1V power supplies

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Jump to the bitmap according to the name,

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the 1.1V power supply is directly connected to the camera power supply, without fuse in the middle

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Pin 16 of the connector is the 2.85V power supply

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Jump to the bitmap according to the name,

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the 2.85V power supply is also directly connected to the camera power supply

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Next, look for the open signal from the camera power supply to the front camera

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Pin 10 of the connector is the open signal

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Jump to the bitmap according to the name,

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the open signal is also directly connected to the camera power supply,

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there is no fuse in the middle

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Let's find the LPDP data bus from the front camera to the CPU

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Pins 3, 5, 9, and 11 of the connector are LPDP buses

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Pin 3, LPDP bus, jump to the bitmap according to the name,

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the pin is connected to the coupling capacitor C10721

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And connected to the CPU after passing through the capacitor

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Pin 5, jump to the bitmap according to the name,

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it is connected to the coupling capacitor C10720,

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and then connected to the CPU after passing through the capacitor

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Pin 9, jump to the bitmap according to the name,

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it is connected to the coupling capacitor C10723,

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and then connected to the CPU after passing through the capacitor

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Pin 11, jump to the bitmap according to the name,

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it is connected to the coupling capacitor C10722,

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and then connected to the CPU after passing through the capacitor

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The LPDP bus is connected to the CPU through coupling capacitors

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If a capacitor is damaged or missing, the camera cannot be used

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That's all for this video